Brain imaging predicts who will be a good musical performer.

Fascinating observations from Zatorre's group:

Significance

In sophisticated auditory–motor learning such as musical instrument learning, little is understood about how brain plasticity develops over time and how the related individual variability is reflected in the neural architecture. In a longitudinal fMRI training study on cello learning, we reveal the integrative function of the dorsal cortical stream in auditory–motor information processing, which comes online quickly during learning. Additionally, our data show that better performers optimize the recruitment of regions involved in auditory encoding and motor control and reveal the critical role of the pre-supplementary motor area and its interaction with auditory areas as predictors of musical proficiency. The present study provides unprecedented understanding of the neural substrates of individual learning variability and therefore has implications for pedagogy and rehabilitation.

Abstract

The auditory and motor neural systems are closely intertwined, enabling people to carry out tasks such as playing a musical instrument whose mapping between action and sound is extremely sophisticated. While the dorsal auditory stream has been shown to mediate these audio–motor transformations, little is known about how such mapping emerges with training. Here, we use longitudinal training on a cello as a model for brain plasticity during the acquisition of specific complex skills, including continuous and many-to-one audio–motor mapping, and we investigate individual differences in learning. We trained participants with no musical background to play on a specially designed MRI-compatible cello and scanned them before and after 1 and 4 wk of training. Activation of the auditory-to-motor dorsal cortical stream emerged rapidly during the training and was similarly activated during passive listening and cello performance of trained melodies. This network activation was independent of performance accuracy and therefore appears to be a prerequisite of music playing. In contrast, greater recruitment of regions involved in auditory encoding and motor control over the training was related to better musical proficiency. Additionally, pre-supplementary motor area activity and its connectivity with the auditory cortex during passive listening before training was predictive of final training success, revealing the integrative function of this network in auditory–motor information processing. Together, these results clarify the critical role of the dorsal stream and its interaction with auditory areas in complex audio–motor learning.

Why are religious people trusted more?

A prevailing view is that religious behavior facilitate trust, primarily toward coreligionists, and particularly when it is diagnostic of belief in moralizing deities. Moon et al. suggest a further reason that religious people are viewed as more trustworthy than non-religious people: they follow 'slow life-history' strategies that tend to be sexually restricted, invested in family, nonimpulsive, and nonaggressive, all traits that associated with cooperativeness and prosociality. They find that direct information about life history reproductive strategy (i.e., a subject's “dating preferences”) tend to override the effects of religious information. Their abstract:

Religious people are more trusted than nonreligious people. Although most theorists attribute these perceptions to the beliefs of religious targets, religious individuals also differ in behavioral ways that might cue trust. We examined whether perceivers might trust religious targets more because they heuristically associate religion with slow life-history strategies. In three experiments, we found that religious targets are viewed as slow life-history strategists and that these findings are not the result of a universally positive halo effect; that the effect of target religion on trust is significantly mediated by the target’s life-history traits (i.e., perceived reproductive strategy); and that when perceivers have direct information about a target’s reproductive strategy, their ratings of trust are driven primarily by his or her reproductive strategy, rather than religion. These effects operate over and above targets’ belief in moralizing gods and offer a novel theoretical perspective on religion and trust.

Seven creepy Facebook patents

I'll follow yesterday's post with yet another post on creepy high tech patents, this time from Facebook, showing their ongoing intention to invade our privacy as much as possible. From the article by Chinoy:

Reading your relationships

One patent application discusses predicting whether you’re in a romantic relationship using information such as how many times you visit another user’s page, the number of people in your profile picture and the percentage of your friends of a different gender.

Classifying your personality

Another proposes using your posts and messages to infer personality traits. It describes judging your degree of extroversion, openness or emotional stability, then using those characteristics to select which news stories or ads to display.

Predicting your future

This patent application describes using your posts and messages, in addition to your credit card transactions and location, to predict when a major life event, such as a birth, death or graduation, is likely to occur.

Identifying your camera

Another considers analyzing pictures to create a unique camera “signature” using faulty pixels or lens scratches. That signature could be used to figure out that you know someone who uploads pictures taken on your device, even if you weren’t previously connected. Or it might be used to guess the “affinity” between you and a friend based on how frequently you use the same camera.

Listening to your environment

This patent application explores using your phone microphone to identify the television shows you watched and whether ads were muted. It also proposes using the electrical interference pattern created by your television power cable to guess which show is playing.

Tracking your routine

Another patent application discusses tracking your weekly routine and sending notifications to other users of deviations from the routine. In addition, it describes using your phone’s location in the middle of the night to establish where you live.

Inferring your habits

This patent proposes correlating the location of your phone to locations of your friends’ phones to deduce whom you socialize with most often. It also proposes monitoring when your phone is stationary to track how many hours you sleep.

A patent for emotional robots?

I recently received an interesting email from Deepak Gupta, who is with a patent research services company, who, having seen my post on robots and emotion, thought to point me to a description of a patent application filed by Samsung. It seems so straightforward that I would have thought that such a patent would have been proposed years ago. It is an attempt to get past the "uncanny valley" issue, the feelings of eeriness and revulsion people can have in observing or interacting with robots. (It still seems a bit scary to me.)

...an electronic robot includes a motor mounted inside its head. A head part of the robot consists of a display unit, to display emotional expressions and a motor control unit that can rotate the robot’s head in a clockwise or counter-clockwise direction on its axis.

The electronic robot decides which emotional expression to be displayed on a display panel by sensing information from its various sensors, such as a camera sensor, a pressure sensor, a geomagnetic sensor, and a microphone to sense the motion of a user. Accordingly, the electronic robot tracks the major feature points of the face such as eyes, nose, mouth, and eyebrows from user images captured by the camera sensor and recognizes user emotional information, based on basic facial expressions conveying happiness, surprise, anger, sadness, and sorrow. Once the information is received from the sensors, the data is then analyzed by the processor that sends an appropriate voltage signal to the display unit and the motor control unit in order to express relevant emotion. The emotional states expressed by the electronic robot include anger, disgust, sadness, interest, happiness, impassiveness, surprise, agreement (i.e., “yes”), and rejection (i.e., “no”).

To express emotional states, the electronic robot stores motion information of the head predefined for each emotional state in a storage unit. The head motion information includes head motion type, angle, speed (or rotational force), and direction.

The technology disclosed in the patent document allows robots to express emotions. Therefore, these robots can communicate or interact with humans more effectively. These robots can be used in the applications that require interaction with humans, for instance, communicating with patients in a hospital in the absence of actual staff, or even interacting with pets such as dogs or cats that are left alone by their owners during their working hours.

An optimistic outlook creates a rosy past.

From Devitt and Schacter in the Harvard Psychology department, a study recruiting the usual gaggle of psychology undergraduate students as subjects:

People frequently engage in future thinking in everyday life, but it is unknown how simulating an event in advance changes how that event is remembered once it takes place. To initiate study of this important topic, we conducted two experiments in which participants simulated emotional events before learning the hypothetical outcome of each event via narratives. Memory was assessed for emotional details contained in those narratives. Positive simulation resulted in a liberal response bias for positive information and a conservative bias for negative information. Events preceded by positive simulation were considered more favorably in retrospect. In contrast, negative simulation had no impact on subsequent memory. Results were similar across an immediate and delayed memory test and for past and future simulation. These results provide novel insights into the cognitive consequences of episodic future simulation and build on the optimism-bias literature by showing that adopting a favorable outlook results in a rosy memory.

Stress and autoimmune disease

I am now in my 77th year, and not all that pleased that my inflammatory, immune, and stress systems are becoming more excitable, more likely to be activated by small environmental perturbations that went unnoticed 10 or 20 years ago. Increases in sympathetic nervous system and inflammatory process with aging have been documented in many studies, and there is a literature linking stress with immune system dysfunction at all ages. This post points to yet another study of the linkage of stress with immune system activity. Song et al. report a massive study of over one million people in a Swedish cohort over a thirty year period that shows a strong association between persons suffering stress disorders and increased risk of developing autoimmune diseases such as arthritis and Crohn's disease. This affirms the strong link between psychological stress and physical inflammatory conditions. Here is a truncated and edited statement of results from the JAMA paper:

The median age at diagnosis of stress-related disorders was 41 years, and 40% of the exposed (i.e. suffering from stress-related disorder) patients were male. During a mean follow-up of 10 years, the incidence rate of autoimmune diseases was 9.1, 6.0, and 6.5 per 1000 person-years among the exposed, matched unexposed, and sibling cohorts, respectively. Compared with the unexposed population, patients with stress-related disorders were at increased risk of autoimmune disease... Persistent use of selective serotonin reuptake inhibitors during the first year of posttraumatic stress disorder diagnosis was associated with attenuated relative risk of autoimmune disease.

Social media and democracy

This post passes on links to articles on social media discussed recently in the Univ. of Wisconsin Chaos and Complex Systems seminar that I attend. (Two previous MindBlog posts have noted Jaron Lanier's critique of social media, "Ten arguments for deleting your social media accounts right now," which coins an acronym, BUMMER, for what Lanier considers one of its core evils. BUMMER is “Behaviors of Users Modified, and Made Into an Empire for Rent.”)  I want to point now to Franklin Foer's review of Lanier's book (Foer claims he actually deleted his Facebook account after reading the book. I haven't managed to do that.)

As an antidote to the current pessimism about the social effects of social media, Ethan Zuckerman offers an essay "Six or seven things social media can do for democracy." He takes his title from an article by Schudson, “Six or Seven Things News Can Do for Democracy,” that anchored his book, "Why Democracies Need an Unloveable Press." Schudson's list of functions for journalism or news is to inform, investigate, analyze, be a public forum, be a tool for social empathy, be a force for mobilization, and promote representative democracy.

Zukerman makes a similar list for the functions of social media, that I condense here:
1. Social media can inform us. (Arab Spring, Ferguson Missouri) but also misinform us (fake news, pizza parlor prostitution ring.)
2.   Social media can an amplify important voices and issues (which might either strengthen or weaken democracy)
3. Social media can be a tool for connection and solidarity (of either good or evil groups, pro or anti democratic.) 
4. Social media can be a space for mobilization (Tahrir Square, Taksim Gezi Park, Charlottesville, pro or anti-democratic.)
5. Social media can be a space for deliberation debate (yet also disappointing, mean, petty, superficial, uncivil.)  There needs to be more effort to build civil platforms.
6. Social media can show us diversity of views and perspectives.    (However, bubbles, homophily, racism, ethnonationalism, can inhibit this).  Conscious intervention is needed change this.
7. Social media can be a model for democratically governed spaces.   Social platforms should seek, be based on consent of their communities. (Example of Reddit, ~1000 volunteer moderators, rules, policing of rule breakers.)

One of Zuckerman's concluding paragraphs   

Finally, it’s also fair to note that there’s a dark side to every democratic function I’ve listed. The tools that allow marginalized people to report their news and influence media are the same ones that allow fake news to be injected into the media ecosystem. Amplification is a technique used by everyone from Black Lives Matter to neo-Nazis, as is mobilization, and the spaces for solidarity that allow Jen Brea to manage her disease allow “incels” to push each other towards violence. While I feel comfortable advocating for respectful dialog and diverse points of view, someone will see my advocacy as an attempt to push politically correct multiculturalism down their throat, or to silence the exclusive truth of their perspectives through dialog. The bad news is that making social media work better for democracy likely means making it work better for the Nazis as well. The good news is that there’s a lot more participatory democrats than there are Nazis.

The Philosophy we need: Personalism

To his credit, David Brooks keeps searching for moral visions that might be an antidote to our current social and political malaise. A recent Op-Ed piece is on Personalism, the:

...philosophic tendency built on the infinite uniqueness and depth of each person. Over the years people like Walt Whitman, Martin Luther King, William James, Peter Maurin and Wojtyla (who went on to become Pope John Paul II) have called themselves personalists, but the movement is still something of a philosophic nub.

...our culture does a pretty good job of ignoring the uniqueness and depth of each person. Pollsters see in terms of broad demographic groups. Big data counts people as if it were counting apples. At the extreme, evolutionary psychology reduces people to biological drives, capitalism reduces people to economic self-interest, modern Marxism to their class position and multiculturalism to their racial one. Consumerism treats people as mere selves — as shallow creatures concerned merely with the experience of pleasure and the acquisition of stuff.

..personalism is a middle way between authoritarian collectivism and radical individualism. The former subsumes the individual within the collective. The latter uses the group to serve the interests of the self.

Personalism demands that we change the way we structure our institutions. A company that treats people as units to simply maximize shareholder return is showing contempt for its own workers. Schools that treat students as brains on a stick are not preparing them to lead whole lives.

The big point is that today’s social fragmentation didn’t spring from shallow roots. It sprang from worldviews that amputated people from their own depths and divided them into simplistic, flattened identities. That has to change. As Charles Péguy said, “The revolution is moral or not at all.”

Mindfulness can lower your motivation.

Vohs and Hafenbrack do an NYTimes opinion piece to advertise their forthcoming paper on effects of meditation. Given my personal experience with 'mindfulness' I think they are right on track. Some clips:

The practical payoff of mindfulness is backed by dozens of studies linking it to job satisfaction, rational thinking and emotional resilience...But on the face of it, mindfulness might seem counterproductive in a workplace setting. A central technique of mindfulness meditation, after all, is to accept things as they are. Yet companies want their employees to be motivated. And the very notion of motivation — striving to obtain a more desirable future — implies some degree of discontentment with the present, which seems at odds with a psychological exercise that instills equanimity and a sense of calm.

To test this hunch, we recently conducted five studies, involving hundreds of people, to see whether there was a tension between mindfulness and motivation...Among those who had meditated, motivation levels were lower on average. Those people didn’t feel as much like working on the assignments, nor did they want to spend as much time or effort to complete them. Meditation was correlated with reduced thoughts about the future and greater feelings of calm and serenity — states seemingly not conducive to wanting to tackle a work project...previous studies have found that meditation increases mental focus, suggesting that those in our studies who performed the mindfulness exercise should have performed better on the tasks. Their lower levels of motivation, however, seemed to cancel out that benefit...Mindfulness is perhaps akin to a mental nap. Napping, too, is associated with feeling calm, refreshed and less harried. Then again, who wakes up from a nap eager to organize some files?

Mindfulness might be unhelpful for dealing with difficult assignments at work, but it may be exactly what is called for in other contexts. There is no denying that mindfulness can be beneficial, bringing about calm and acceptance. Once you’ve reached a peak level of acceptance, however, you’re not going to be motivated to work harder.

Deep origins of consciousness

I want to recommend an engaging book by Peter Godfrey-Smith that I have read recently, "Other Minds: The Octopus, theSea, and the Deep Origins of Consciousness." Below are a few clips pointing to some of his core points:

Sentience is brought into being somehow from the evolution of sensing and acting; it involves being a living system with a point of view on the world around it. If we take that approach, though, a perplexity we run into immediately is the fact that those capacities are so widespread— they are found far outside the organisms that are usually thought to have experience of some kind. Even bacteria sense the world and act... A case can be made that responses to stimuli, and the controlled flow of chemicals across boundaries, are an elementary part of life itself. Unless we conclude that all living things have a modicum of subjective experience— a view I don’t regard as insane, but surely one that would need a lot of defense— there must be something about the way animals deal with the world that makes a crucial difference.

The senses can do their basic work, and actions can be produced, with all this happening “in silence” as far as the organism’s experience is concerned. Then, at some stage in evolution, extra capacities appear that do give rise to subjective experience: the sensory streams are brought together, an “internal model” of the world arises, and there’s a recognition of time and self.

What we’ve learned over the last thirty years or so is that there’s a particular style of processing— one that we use to deal especially with time, sequences, and novelty— that brings with it conscious awareness, while a lot of other quite complex activities do not.

Baars suggested that we are conscious of the information that has been brought into a centralized “workspace” in the brain. Dehaene adopted and developed this view. A related family of theories claim that we are conscious of whatever information is being fed into working memory,These views don’t hold that the lights went on in a sudden flash, but they do hold that the “waking up” came late in the history of life and was due to features that are clearly seen only in animals like us.

...certainly there’s an alternative to consider. I’ll call this the transformation view. It holds that a form of subjective experience preceded late-arising things like working memory, workspaces, the integration of the senses, and so on. These complexities, when they came along, transformed what it feels like to be an animal. Experience has been reshaped by these features, but it was not brought into being by them. The best argument I can offer for this alternative view is based on the role in our lives of what seem like old forms of subjective experience that appear as intrusions into more organized and complex mental processes. Consider the intrusion of sudden pain, or of what the physiologist Derek Denton calls the primordial emotions— feelings which register important bodily states and deficiencies, such as thirst or the feeling of not having enough air. As Denton says, these feelings have an “imperious” role when they are present: they press themselves into experience and can’t easily be ignored. Do you think that those things (pain, shortness of breath, etc.) only feel like something because of sophisticated cognitive processing in mammals that has arisen late in evolution? I doubt it. Instead, it seems plausible that an animal might feel pain or thirst without having an “inner model” of the world, or sophisticated forms of memory.

Subjective experience does not arise from the mere running of the system, but from the modulation of its state, from registering things that matter. These need not be external events; they might arise internally. But they are tracked because they matter and require a response. Sentience has some point to it. It’s not just a bathing in living activity.

By the Cambrian, the vertebrates were already on their own path (or their own collection of paths), while arthropods and mollusks were on others. Suppose it’s right that crabs, octopuses, and cats all have subjective experience of some kind. Then there were at least three separate origins for this trait, and perhaps many more than three. Later, as the machinery described by Dehaene, Baars, Milner, and Goodale comes on line, an integrated perspective on the world arises and a more definite sense of self. We then reach something closer to consciousness. I don’t see that as a single definite step. Instead, I see “consciousness” as a mixed-up and overused but useful term for forms of subjective experience that are unified and coherent in various ways. Here, too, it is likely that experience of this kind arose several times on different evolutionary paths: from white noise, through old and simple forms of experience, to consciousness.

Brain EEG activity can predict who antidepressants will work on

Pizzagalli et al. have used electroencephalography (EEG) to look at the activation level of the rostral anterior cingulate cortex (ACC) in depressed patients. In an experiment involving 300 patients at four different sites (with randomized controls) they find that higher activity in this area correlates with a higher probability that treatment with the SSRI (selective serotonin re-uptake inhibitor) sertraline hydrochloride will be effective after an eight week course of treatment. The prediction of drug efficacy made with this approach is more reliable than current guessing using other clinical and demographic characteristics that also correlate with treatment outcomes.

Old Italian violins imitate the human voice.

A fascinating study from Tai et al. (open source):

Significance

Amati and Stradivari violins are highly appreciated by musicians and collectors, but the objective understanding of their acoustic qualities is still lacking. By applying speech analysis techniques, we found early Italian violins to emulate the vocal tract resonances of male singers, comparable to basses or baritones. Stradivari pushed these resonance peaks higher to resemble the shorter vocal tract lengths of tenors or altos. Stradivari violins also exhibit vowel qualities that correspond to lower tongue height and backness. These properties may explain the characteristic brilliance of Stradivari violins. The ideal for violin tone in the Baroque era was to imitate the human voice, and we found that Cremonese violins are capable of producing the formant features of human singers.

Abstract

The shape and design of the modern violin are largely influenced by two makers from Cremona, Italy: The instrument was invented by Andrea Amati and then improved by Antonio Stradivari. Although the construction methods of Amati and Stradivari have been carefully examined, the underlying acoustic qualities which contribute to their popularity are little understood. According to Geminiani, a Baroque violinist, the ideal violin tone should “rival the most perfect human voice.” To investigate whether Amati and Stradivari violins produce voice-like features, we recorded the scales of 15 antique Italian violins as well as male and female singers. The frequency response curves are similar between the Andrea Amati violin and human singers, up to ∼4.2 kHz. By linear predictive coding analyses, the first two formants of the Amati exhibit vowel-like qualities (F1/F2 = 503/1,583 Hz), mapping to the central region on the vowel diagram. Its third and fourth formants (F3/F4 = 2,602/3,731 Hz) resemble those produced by male singers. Using F1 to F4 values to estimate the corresponding vocal tract length, we observed that antique Italian violins generally resemble basses/baritones, but Stradivari violins are closer to tenors/altos. Furthermore, the vowel qualities of Stradivari violins show reduced backness and height. The unique formant properties displayed by Stradivari violins may represent the acoustic correlate of their distinctive brilliance perceived by musicians. Our data demonstrate that the pioneering designs of Cremonese violins exhibit voice-like qualities in their acoustic output.

Families and politics - curtailed conversations

Chen and Rohla find that Thanksgiving dinners in which the hosts and guests lived in oppositely voting precincts were up to 50 minutes shorter than same-party-precinct dinner. It seems likely that avoiding talking about contentious subjects lead guests to simply talk less.

Research on growing American political polarization and antipathy primarily studies public institutions and political processes, ignoring private effects, including strained family ties. Using anonymized smartphone-location data and precinct-level voting, we show that Thanksgiving dinners attended by residents from opposing-party precincts were 30 to 50 minutes shorter than same-party dinners. This decline from a mean of 257 minutes survives extensive spatial and demographic controls. Reductions in the duration of Thanksgiving dinner in 2016 tripled for travelers from media markets with heavy political advertising—an effect not observed in 2015—implying a relationship to election-related behavior. Effects appear asymmetric: Although fewer Democratic-precinct residents traveled in 2016 than in 2015, Republican-precinct residents shortened their Thanksgiving dinners by more minutes in response to political differences. Nationwide, 34 million hours of cross-partisan Thanksgiving dinner discourse were lost in 2016 owing to partisan effects.

Tipping points in changing social conventions.

How can we explain the rapid rise of the Nazis in 1930s Germany or the rapid acceptance of gay marriage in the United States? Centola et al. approach this question by doing both modeling and experiments illustrating how a motivated minority can change a social convention. They

...study a system of coordination in which a minority group of actors attempt to disrupt an established equilibrium behavior. In both our theoretical framework and the empirical setting, we adopt the canonical approach of using coordination on a naming convention as a general model for conventional behavior. Our experimental approach is designed to test a broad range of theoretical predictions derived from the existing literature on critical mass dynamics in social conventions.

Here is the Science Magazine summary followed by the abstract:

Once a population has converged on a consensus, how can a group with a minority viewpoint overturn it? Theoretical models have emphasized tipping points, whereby a sufficiently large minority can change the societal norm. Centola et al. devised a system to study this in controlled experiments. Groups of people who had achieved a consensus about the name of a person shown in a picture were individually exposed to a confederate who promoted a different name. The only incentive was to coordinate. When the number of confederates was roughly 25% of the group, the opinion of the majority could be tipped to that of the minority.

Abstract

Theoretical models of critical mass have shown how minority groups can initiate social change dynamics in the emergence of new social conventions. Here, we study an artificial system of social conventions in which human subjects interact to establish a new coordination equilibrium. The findings provide direct empirical demonstration of the existence of a tipping point in the dynamics of changing social conventions. When minority groups reached the critical mass—that is, the critical group size for initiating social change—they were consistently able to overturn the established behavior. The size of the required critical mass is expected to vary based on theoretically identifiable features of a social setting. Our results show that the theoretically predicted dynamics of critical mass do in fact emerge as expected within an empirical system of social coordination.

The misunderstood sixth mass extinction

Paul Ehrlich, 50 years after the publication of "The Population Bomb," together with Gerardo Ceballos, has written a concise rebuttal of scientists (and the politicians who listen to them) who suggest that the current anthropogenic mass extinction will not have dire consequences:

Scientific misunderstanding about the nature and consequences of the sixth mass extinction has led to confusion among policy-makers and the public. Scientists agree that there have been five mass extinctions in the past 600 million years (1). Although scientists also agree that Earth is now suffering the sixth mass extinction, they disagree about its consequences. Mass extinctions are defined as the loss of the majority of species in a relatively short geological time, caused by a catastrophic natural event (2). Some scientists argue that there is no reason for concern about the sixth mass extinction because extinction is normal, simply an inevitable consequence of the process of evolution (3, 4). This misunderstanding ignores some critical issues. First, the rate of species extinction is now as much as 100 times that of the “normal rate” throughout geological time (5, 6). Second, like the past mass extinctions, the current episode is not an inevitable consequence of the process of evolution. Rather, it is the result of a rare event changing the environment so quickly that many organisms cannot evolve in response to it.

In theory, evolution on Earth could proceed as long as conditions permitted with no mass extinction events. That has been the case for vast stretches of geological time between occasional encounters with unusual environmental circumstances. Extinctions did occur, but not suddenly and nearly universally, as is happening now (7, 8). The rate and extent of current extinctions is similar to those of past mass extinctions, not the intervals between them (9, 10). If past mass extinctions are any guide to the rate at which usual evolutionary diversification processes could restore a reasonable level of biodiversity and ecosystem services, the wait is likely to be millions, or even tens of millions of years (8, 9).

At the time of the past mass extinctions, there was no industrialized human population of almost 8 billion people utterly dependent on the ecosystem services biodiversity helps provide, such as pollination, pest control, and climate amelioration (7, 8, 11). Scientists who deny that the current mass extinction has dire consequences, and policy-makers who listen to them, fail to appreciate the penalties human civilization will suffer for continuing on society's business-as-usual course (2–5). Moreover, beyond the consequences to humans, exterminating most of the only known living things with which we share the universe is clearly wrong (5–8, 12). The future of life on Earth, and human well-being, depends on the actions that we take to reduce the extinction of populations and species in the next two decades (8). It is irresponsible and unethical not to act despite the overwhelming scientific evidence indicating the severity of the current mass extinction event.

References (see Google Scholar for all)

1. W. J. Ripple et al., Bioscience 67, 197 (2017). 2. A. Hallam, P. B. Wignall, Mass Extinctions and Their Aftermath (Oxford University Press, UK. 1997). 3. S. Brand, “Rethinking extinction” (2015); https://aeon.co/essays/we-are-not-edging-up-to-a-mass-extinction. 4. C. D. Thomas, Inheritors of the Earth (Hachette, UK, 2017). 5. S. L. Pimm et al., Science, 344, 1246752 (2014). 6. G. Ceballos et al., Sci. Adv. 1, e1400253 (2015). 7. R. Dirzo et al., Science 345, 401 (2014). 8. G. Ceballos et al., The Annihilation of Nature: Human Extinction of Birds and Mammals (JHU Press, 2015). 9. D. Jablonski, Evol. Biol. 44, 451 (2017). 10.A. D. Barnosky et al., Nature 471, 51 (2011). 11.C. A. Hallmann, PLOS One 12, e0185809 (2017).C 12.P. R. Ehrlich, A. H. Ehrlich, Proc. R. Soc. B 280, 20122845 (2013).

Comparing human prefrontal cortex to that of other primates

From Donahue et al.:

Significance

A longstanding controversy in neuroscience pertains to differences in human prefrontal cortex (PFC) compared with other primate species; specifically, is human PFC disproportionately large? Distinctively human behavioral capacities related to higher cognition and affect presumably arose from evolutionary modifications since humans and great apes diverged from a common ancestor about 6–8 Mya. Accurate determination of regional differences in the amount of cortical gray and subcortical white matter content in humans, great apes, and Old World monkeys can further our understanding of the link between structure and function of the human brain. Using tissue volume analyses, we show a disproportionately large amount of gray and white matter corresponding to PFC in humans compared with nonhuman primates.

Abstract

Humans have the largest cerebral cortex among primates. The question of whether association cortex, particularly prefrontal cortex (PFC), is disproportionately larger in humans compared with nonhuman primates is controversial: Some studies report that human PFC is relatively larger, whereas others report a more uniform PFC scaling. We address this controversy using MRI-derived cortical surfaces of many individual humans, chimpanzees, and macaques. We present two parcellation-based PFC delineations based on cytoarchitecture and function and show that a previously used morphological surrogate (cortex anterior to the genu of the corpus callosum) substantially underestimates PFC extent, especially in humans. We find that the proportion of cortical gray matter occupied by PFC in humans is up to 1.9-fold greater than in macaques and 1.2-fold greater than in chimpanzees. The disparity is even more prominent for the proportion of subcortical white matter underlying the PFC, which is 2.4-fold greater in humans than in macaques and 1.7-fold greater than in chimpanzees.

Evolutionary cognition - bees demonstrate an understanding of zero

Howard et al. demonstrate an astounding evolutionary convergence by showing that insects have developed the concept of zero, a capability once thought to be a unique major intellectual advance in humans. The last common ancestor of humans and the honeybees used in the experiments lived more than 600 million years ago. Their abstract:

Some vertebrates demonstrate complex numerosity concepts—including addition, sequential ordering of numbers, or even the concept of zero—but whether an insect can develop an understanding for such concepts remains unknown. We trained individual honey bees to the numerical concepts of “greater than” or “less than” using stimuli containing one to six elemental features. Bees could subsequently extrapolate the concept of less than to order zero numerosity at the lower end of the numerical continuum. Bees demonstrated an understanding that parallels animals such as the African grey parrot, nonhuman primates, and even preschool children.

...and a description of their experiment from a review by Nieder:

...the authors lured free-flying honey bees from maintained hives to their testing apparatus (see the figure) and marked the insects with color for identification. They rewarded the bees for discriminating displays on a screen that showed different numbers (numerosities) of items. The researchers controlled for systematic changes in the appearance of the numerosity displays that occur when the number of items is changed. They thus ensured that the bees were discriminating between different numbers, rather than responding to low-level visual cues.

First, the researchers trained the bees to rank two numerosity displays at a time. Over the course of training, they changed the numbers presented to encourage rule learning. Bees from one group were rewarded with a sugar solution whenever they flew to the display showing more items, thereby following a greater-than rule. The other group of bees was trained on the less-than rule and rewarded for landing at the display that presented fewer items. The bees learned to master this task with displays consisting of one to four items; they were able to do so not only for familiar numerosity displays but also for new displays.

Next, the researchers occasionally inserted displays containing no item. Would the bees understand that empty displays could be ranked with countable numerosities? Indeed, the bees obeying the less-than rule spontaneously landed on displays showing no item, that is, an empty set (see the figure). In doing so, bees understood that the empty set was numerically smaller than sets of one, two, or more items. Further experiments confirmed that this behavior was related to quantity estimation and not a product of the learning history.

Jaron Lanier on why you should delete your social media accounts.

I have read through Jared Lanier's "Ten Arguments for Deleting Your Social Media Accounts Right Now." His critiques are important and compelling, and I want to pass on just a few clips of text that give you gist of his arguments:

ARGUMENT ONE: YOU ARE LOSING YOUR FREE WILL

We’re being tracked and measured constantly, and receiving engineered feedback all the time. We’re being hypnotized little by little by technicians we can’t see, for purposes we don’t know. We’re all lab animals now...Now everyone who is on social media is getting individualized, continuously adjusted stimuli, without a break, so long as they use their smartphones. What might once have been called advertising must now be understood as continuous behavior modification on a titanic scale...This book argues in ten ways that what has become suddenly normal— pervasive surveillance and constant, subtle manipulation— is unethical, cruel, dangerous, and inhumane. Dangerous? Oh, yes, because who knows who’s going to use that power, and for what?

The core process that allows social media to make money and that also does the damage to society is behavior modification. Behavior modification entails methodical techniques that change behavioral patterns in animals and people. It can be used to treat addictions, but it can also be used to create them...Using symbols instead of real rewards has become an essential trick in the behavior modification toolbox. For instance, a smartphone game like Candy Crush uses shiny images of candy instead of real candy to become addictive...somewhat random or unpredictable feedback can be more engaging than perfect feedback.

The prime directive to be engaging reinforces itself, and no one even notices that negative emotions are being amplified more than positive ones. Engagement is not meant to serve any particular purpose other than its own enhancement, and yet the result is an unnatural global amplification of the “easy” emotions, which happen to be the negative ones.

Social media is biased, not to the Left or the Right, but downward. The relative ease of using negative emotions for the purposes of addiction and manipulation makes it relatively easier to achieve undignified results. An unfortunate combination of biology and math favors degradation of the human world. Information warfare units sway elections, hate groups recruit, and nihilists get amazing bang for the buck when they try to bring society down.

One of the main reasons to delete your social media accounts is that there isn’t a real choice to move to different social media accounts. Quitting entirely is the only option for change. If you don’t quit, you are not creating the space in which Silicon Valley can act to improve itself...the problem isn’t behavior modification in itself. The problem is relentless, robotic, ultimately meaningless behavior modification in the service of unseen manipulators and uncaring algorithms.

ARGUMENT TWO: QUITTING SOCIAL MEDIA IS THE MOST FINELY TARGETED WAY TO RESIST THE INSANITY OF OUR TIMES

I speak as a computer scientist, not as a social scientist or psychologist. From that perspective, I can see that time is running out. The world is changing rapidly under our command, so doing nothing is not an option. We don’t have as much in the way of rigorous science as would be ideal for understanding our situation, but we have enough results to describe the problem we must solve, just not a lot of time in which to solve it. Seems like a good moment to coin an acronym so I don’t have to repeat, over and over, the same account of the pieces that make up the problem. How about “Behaviors of Users Modified, and Made into an Empire for Rent”? BUMMER.

ARGUMENT EIGHT: SOCIAL MEDIA DOESN’T WANT YOU TO HAVE ECONOMIC DIGNITY

The corp perspective

One problem with the BUMMER model is that it’s like oil for a petrostate. A BUMMER-dependent company can diversify its activities— its cost centers— all it wants, but it can never diversify its profit centers, because it always has to prioritize free services in order to grab more data to run the manipulation services. Consumers are addicted, but so are the BUMMER empires.

BUMMER makes tech companies brittle and weirdly stagnant. Of the big five tech companies, only two depend on the BUMMER model. Apple, Amazon, and Microsoft all indulge in a little BUMMER, but they all do just fine without depending on BUMMER. The non-BUMMER big tech companies have successfully diversified. There are plenty of reasons you might want to criticize and change those three companies, but the amount of BUMMER they foster is not an existential threat to civilization.

The two tech giants that are hooked on BUMMER, Google and Facebook, are way hooked. They make the preponderance of their profits from BUMMER despite massive investments in trying to start up other types of businesses. No matter the scale, a company based on a single trick is vulnerable. Sooner or later some disruption will come along, and then a BUMMER company, no matter how large, will quickly collapse.

So why is it again, that BUMMER is such a great long-term strategy for tech companies? It isn’t. It trades the short term against the long term, just like a petrostate...Instead of trying to shut down BUMMER companies, we should ask them to innovate their business models, for their own good.

The user perspective

It might sound undesirable to someday have to pay for things that are currently free, but remember, you’d also be able to make money from those things. And paying for stuff sometimes really does make the world better for everyone. Techies who advocated a free/ open future used to argue that paying for movies or TV was a terrible thing, and that the culture of the future would be made of volunteerism, with the digital distribution funded by advertising, of course. This was practically a religious belief in Silicon Valley when the big BUMMER companies were founded. It was sacrilege to challenge it.

But then companies like Netflix and HBO convinced people to pay a monthly fee, and the result is what is often called “peak TV.” Why couldn’t there also be an era of paid “peak social media” and “peak search”? ...Watch the end credits on a movie on Netflix or HBO. It’s good discipline for lengthening your attention span! Look at all those names scrolling by. All those people who aren’t stars made their rent by working to bring you that show.

BUMMER only supports stars. If you are one of those rare, rare people who are making a decent living off BUMMER as an influencer, 4 for instance, you have to understand that you are in a tiny club and you are vulnerable. Please make backup plans! I hate raining on dreams, but if you think you are about to make a living as an influencer or similar, the statistics are voraciously against you, no matter how deserving you are and no matter how many get-rich-quick stories you’ve been fed. The problem isn’t that there are only a few stars; that’s always true, by definition. The problem is that BUMMER economics allow for almost no remunerative roles for near-stars. In a genuine, deep economy, there are many roles. You might not become a pro football player, but you might get into management, sports media, or a world of other related professions. But there are vanishingly few economic roles adjacent to a star influencer. Have a backup plan.

When social media companies are paid directly by users instead of by hidden third parties, then they will serve those users. It’s so simple. Someone will be able to pay to see poisonous propaganda, but they won’t be able to pay to have that poison directed at someone else. The incentive for poisoning the world will be undone...I won’t have an account on Facebook, Google, or Twitter until I can pay for it— and I unambiguously own and set the price for using my data, and it’s easy and normal to earn money if my data is valuable. I might have to wait a while, but it’ll be worth it. 

ARGUMENT 10: SOCIAL MEDIA HATES YOUR SOUL.

It’s almost impossible to write about the deepest spiritual or philosophical topics, because people are on such hair triggers about them, but it would be a cop-out to avoid declaring a statement of beliefs regarding the basic questions that BUMMER is trying to dominate… I am conscious. I have faith that you are also conscious. We each experience. It’s a marvel… Acknowledging that experience exists might make us kinder, since we understand people to be more than machines. We might be a little more likely to think before hurting someone if we believe there’s a whole other center of experience cloaked in that person, a whole universe, a soul.

The BUMMER business is interwoven with a new religion that grants empathy to computer programs— calling them AI programs— as a way to avoid noticing that it is degrading the dignity, stature, and rights of real humans … The BUMMER experience is that you’re just one lowly cell in the great superorganism of the BUMMER platform. We talk to our BUMMER-connected gadgets kind of as if they’re people, and the “conversation” works better if we talk in a way that makes us kind of like machines. When you live as if there’s nothing special, no mystical spark inside you, you gradually start to believe it.

The issues that are tearing the United States apart are all about whether people are special, about where the soul might be found, if it is there at all. Is abortion acceptable? Will people become obsolete, so that everyone but a few elite techies will have to be supported by a charitable basic income scheme? Should we treat all humans as being equally worthy, or are some humans more deserving of self-determination because they are good at nerdy tasks? These questions might all look different at first, but on closer inspection they are all versions of the same question: What is a person? Whatever a person might be, if you want to be one, delete your accounts.

(above clips taken from Lanier, Jaron. Ten Arguments for Deleting Your Social Media Accounts Right Now Henry Holt and Co.. Kindle Edition. )

What makes a man attractive?

In many species female mate preference is influenced by signs indicating the health and robustness of the potential male partner. Rehm points to work by Versluys et al. examining the effects of male arm to body and intra-limb ratio on the preferences of heterosexual US women by showing them computer-generated male images that vary average body proportions from 9000 US military men by making arms and legs slightly longer or shorter. Previous research had shown that women prefer men with legs that are about half their height (legs that are too short have been linked to type 2 diabetes). How long the model’s arms were relative to his height didn’t seem to matter; and women cared only a little about how the elbow or knee divided a limb. But as seen in previous work, women noticed if the legs made up more or less than half his height—and they didn’t like it.

Socioeconomic status moderates age-related differences in brain organization throughout adulthood.

Work by Chan et al. (open source article) suggests that higher socioeconomic status (SES) may be a protective factor against age-related brain decline.

Significance

An individual’s socioeconomic status (SES) is a central feature of their environmental surroundings and has been shown to relate to the development and maturation of their brain in childhood. Here, we demonstrate that an individual’s present (adult) SES relates to their brain function and anatomy across a broad range of middle-age adulthood. In middle-aged adults (35–64 years), lower SES individuals exhibit less organized functional brain networks and reduced cortical thickness compared with higher SES individuals. These relationships cannot be fully explained by differences in health, demographics, or cognition. Additionally, childhood SES does not explain the relation between SES and brain network organization. These observations provide support for a powerful relationship between the environment and the brain that is evident in adult middle age.

Abstract

An individual’s environmental surroundings interact with the development and maturation of their brain. An important aspect of an individual’s environment is his or her socioeconomic status (SES), which estimates access to material resources and social prestige. Previous characterizations of the relation between SES and the brain have primarily focused on earlier or later epochs of the lifespan (i.e., childhood, older age). We broaden this work to examine the relationship between SES and the brain across a wide range of human adulthood (20–89 years), including individuals from the less studied middle-age range. SES, defined by education attainment and occupational socioeconomic characteristics, moderates previously reported age-related differences in the brain’s functional network organization and whole-brain cortical structure. Across middle age (35–64 years), lower SES is associated with reduced resting-state system segregation (a measure of effective functional network organization). A similar but less robust relationship exists between SES and age with respect to brain anatomy: Lower SES is associated with reduced cortical gray matter thickness in middle age. Conversely, younger and older adulthood do not exhibit consistent SES-related difference in the brain measures. The SES–brain relationships persist after controlling for measures of physical and mental health, cognitive ability, and participant demographics. Critically, an individual’s childhood SES cannot account for the relationship between their current SES and functional network organization. These findings provide evidence that SES relates to the brain’s functional network organization and anatomy across adult middle age, and that higher SES may be a protective factor against age-related brain decline.

Figure - (click to enlarge) Lower SES adults exhibit reduced segregation of their resting-state functional brain networks and lower mean cortical thickness in middle-age adulthood. For each age group, brain system segregation (A) and mean cortical thickness (B) are plotted for higher and lower SES (stratified using a median split across the entire participant sample; error bars depict standard error of the mean). Higher SES is associated with greater brain system segregation and mean cortical thickness in middle-age groups (ME, 35–49 y; ML, 50–64 y). Primary statistical models were completed using general linear modeling, where SES was modeled continuously.