THYMOS
A newsletter of research on Consciousness, Mind and Life

by piero scaruffi

Researchers are welcome to submit news and articles about breakthroughs and events in the areas of cognitive science, artificial intelligence, neurobiology, artificial life, linguistics, neural networks, connectionism, cognitive psychology, mind, philosophy, psychology, consciousness. Email the editor at this Email address. Readers who would like to receive periodic news and updates on cognitive science, philosophy of mind, neurobiology, artificial intelligence, etc, are invited to register to my mailing list.

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December 2017

November 2017
  • Gyorgy Buzsaki's team at New York University discovered that when we sleep our brain's hippocampus experiences ripples (high-frequency bursts) of neural firing. We already knew that the hippocampus helps consolidate long-term memories during sleep so those ripples are likely to provide a clue to how that happens. Now the team has discovered similar ripples occurring at the same time in portions of the neocortex. Their experiments with rats confirmed that the synchronized ripples increase a rat's ability to memorize what it has learned. (“Learning-enhanced Coupling Between Ripple Oscillations in Association Cortices and Hippocampus” )
  • Scientists from Goethe University in Frankfurt (Kirsten Hilger, Christian Fiebach and Ulrike Basten), who have long studied the brain’s modular organisation and its association with general intelligence, discovered that the brain of more intelligent individuals displays a form of stronger connectivity: the anterior insula and the anterior cingulate cortex are more efficiently connected to the rest of the brain. ( ("Intelligence is associated with the modular structure of intrinsic brain networks", (Scientific Reports))

October 2017
  • Hyperuniformity explains the bird's visual system. Thomas Hales proved Kepler's conjecture in 1998 (Kepler's conjecture was solved in higher dimensions in 2016 by Maryna Viazovska at the Berlin Mathematical School using the "modular forms" that were used by Andrew Wiles of Princeton University in the proof of Fermat's Last Theorem in 1994). Italian mathematician Salvatore Torquato at Princeton University realized that a common organization of matter underlies the dynamics of bird vision, quasicrystals, quantum ensembles and even the large-scale structure of the universe; and he called it "hyperuniformity" ("Local density fluctuations, hyperuniformity, and order metrics", 2003).
  • Hannelore Ehrenreich of the Max Planck Institute has found more evidence linking pot smoking by teenagers and psychosis ( Scientific American)

September 2017
August 2017
  • Why Freud survives (New Yorker). Despite all the evidence against Freud, his name is still routinely mentioned by all of us. No other scientist who failed so badly is still so readily mentioned in scientific literature.
  • Rogier Kievit of the Cognition and Brain Science Unit at the University of Cambridge provided evidence for the "mutualism" model of brain development, according to which cognitive skills help each other during development (paper)
  • Scientists at Georgia State University have concluded that use of marijuana triples the chance of dying from hypertension. ("Effect of Marijuana Use on Cardiovascular and Cerebrovascular Mortality", 2017)

July 2017
  • Ten years ago Michael Shadlen's team at Columbia University discovered that the brain does not use all the information available before making a decision: there is a threshold beyond which the brain feels confident enough and makes the decision ("Decision-making with multiple alternatives", 2008). They now proved with psychological experiments that that's the moment when you become conscious of that fact as opposed to all the myriad of facts being processed in the brain. You become aware of the fact that has reached that threshold. (Paper: "Piercing of Consciousness as a Threshold-Crossing Operation").
  • Kay Tye's lab at the MIT conducts research on the neural circuit responsible for social behavior in mice". Gillian Matthews is using optogenetics to dissect the neural circuitry underlying social interaction in mice. She found a set of neurons in the dorsal raphe nucleus that respond negatively (like pain) to loneliness and therefore encourage mice to seek out socialization. This "loneliness neurons" were predicted by John Cacioppo (University of Chicago), whose "Loneliness within a nomological net: An evolutionary perspective?" (2005) surveyed lonely young adults and concluded that loneliness is an aversive state and that it has evolutionary value because socializing helped animals survive. Those who had the neurons causing pain in loneliness were more likely to socialize and therefore to survive.

June 2017
  • Scientists at the Universitat Oberta de Catalunya in Spain shoed how videogames change the brain (both its workings and its physical structure). Paper in Frontiers in Human Neuroscience.
  • Blake Richards and Paul Frankland at the Canadian Institute for Advanced Research (CIFAR) are showing that forgetting is as important for human memory as remembering ("The Persistence and Transience of Memory", 2016)
  • That plants communicate via chemical signaling was already observed by David Rhoades at the University of Washington ("Responses of Alder and Willow to Attack by Tent Caterpillars and Webworms", 1983) and by Ian Baldwin and Jack Schultz at Dartmouth University ("Rapid Changes in Tree Leaf Chemistry Induced by Damage: Evidence for Communication Between Plants", published just a few months later in 1983). The idea lay dormant until Ted Farmer (University of Lausanne) and Clarence Ryan published the paper "Interplant Communication" (1990). Now Richard Karban at UC Davis is working on the same idea (Quanta)
  • The team of Henry Markram, founding director of the Blue Brain Project at the EPFL in Switzerland used a mathematical technique to model how the brain processes information. The flow of information can be represented with directed graphs, but this flattens the picture of what happens in the brain. While graph theory has been used to analyze network topology, Markram's team collaborated with two mathematicians (Kathryn Hess from EPFL and Ran Levi from Aberdeen University) who employed algebraic topology to analyze those directed graphs, as pioneered by Francesco Vaccarino at the Institute for Scientific Interchange (ISI) in Italy. The result is a representation that shows a multi-dimensional structure. The brain does not think in three dimensions but in as many as eleven dimensions. (Journal of Frontiers in Neuroscience)
  • Alcohol causes hippocampus shrinkage (Scientific American)
  • Eirk Hoel at Columbia University has proven that new causes can emerge at macroscopic scales i.e. "causal emergence" (Quanta Magazine)
  • John Peever at the University of Toronto is studying the origin of dreaming in the brain and his research shows that not dreaming properly may be related to Parkinson's Disease.
  • Matthias Ekman at Radboud University showed that the visual cortex is not only gathering information from the eyes: it is involved in predicting the future (Article in Nature Communications).
  • Edward Campbell's group at Loyola University Chicago is studying the similarities in the chemical action of Alzheimer's disease, Parkinson's disease, and Huntington's disease (Loyola Univ)

May 2017
April 2017
  • Dani Offen's team at TAU's Sackler School of Medicine has found that cannabis causes schizophrenia in teenagers
  • The University of Basel's Transfaculty Research Platform Molecular and Cognitive Neurosciences group has demonstrated a link between the immune system and the brain (paper). The immune system mainly operates via the blood system which is isolated from the brain, but there seems to be a way that it influences the brain.
  • A report compiled by a team led by Stuart Ritchie at the University of Edinburgh found that women tended to have a significantly thicker cortex than men (the cortex is associated with higher scores on a variety of cognitive and general intelligence tests) while men tend to have bigger brain volumes than women in many subcortical regions such as the hippocampus, the amygdala, striatum, and thalamus.
  • Francesca Siclari's team at the University of Wisconsin-Madison is mapping non-REM dreaming activity, that first was considered non-existent, then minimal and now seems to be as prevalent as REM dreaming. Siclari argues that we dream during about 70% of our non-REM sleep, in addition to 95% of our REM sleep ("The neural correlates of dreaming", 2017).

March 2017
February 2017
January 2017
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