cognitive-science29.21 min read
Brain health can grow at any age with online training, new study finds
3 days ago•Source: PsyPost
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26.835 min•4 days ago
Different cognitive skills have distinct genetic links to psychiatric disorders
A massive genome-wide analysis finds that intelligence is not a single trait: reaction time, fluid reasoning, and crystallized knowledge each have distinct genetic links to psychiatric conditions, with schizophrenia and bipolar disorder tied to slower processing and lower fluid reasoning but higher crystallized knowledge and noncognitive educational skills; ADHD shows faster reaction time but lower fluid/crystallized/noncognitive skills; autism links to higher crystallized knowledge; Alzheimer's risk is linked to lower fluid reasoning. The study identifies 78 loci for crystallized knowledge, maps gene activity across development, notes overlaps with personality traits, and discusses possible evolutionary trade-offs, while highlighting limitations due to data mainly from individuals of European ancestry and urging researchers to treat cognitive domains as separate traits rather than a single score.
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Paper Reading Eases Brain Load Even in Manga, Neuroimaging Shows
PsyPost•28 days ago
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Literacy Rewires How the Brain Processes Speech
New evidence shows learning to read reshapes how the brain processes spoken language: literate adults recruit the right inferior frontal gyrus to perform phonological analysis in unfamiliar speech, a pattern not seen in functionally illiterate peers, indicating literacy training alters auditory processing and relies on neural reorganization.
When thoughts drift, the brain learns hidden patterns more readily, study finds
New research suggests mind wandering temporarily weakens executive control but enhances implicit statistical learning—the brain’s unconscious detection of patterns. In a 240-participant task featuring hidden triplets, off-task periods were linked to slower No-Go responses yet faster learning of high-probability sequences. The learning boost was strongest when inhibitory control was weakest, supporting a neurocompetition model in which relaxed top-down control frees implicit learning. While distraction can hinder immediate task performance, the findings imply a balance between focused attention and mind wandering may improve certain kinds of learning; scientists plan EEG/MEG/fNIRS studies and broader developmental and clinical investigations to explore mechanisms and causality.
Smart by Nature, Stunted by Childhood: Adversity halves intelligence’s trust boost
Higher cognitive ability generally increases generalized trust, but childhood disadvantage weakens this link by about 50%, suggesting early adversity dampens how intelligence translates into social cooperation and contributing to intergenerational inequality.
Time Perception Unfolds Across a Three-Stage Cortical Pathway
A seven-Tesla fMRI study shows that time perception is not a single clock but a three-stage cortical process: early visual areas encode physical durations, parietal and premotor regions map durations across a topographic layout, and frontal regions translate this into a subjective boundary, revealing a distributed, hierarchical network for how the brain experiences the passage of time.
Faces That Stick: Memorable Faces Boost Name Recall
A series of online experiments found that pairing highly memorable faces with names improves name recall, and this memory boost persists even when the face is no longer visible; memorable scenes did not produce the same effect, suggesting faces have a special link to remembering names, though real-world applicability needs further study.
Timing Takes Center Stage: A New Rule for Pavlovian Learning
A Nature Neuroscience study in mice shows that learning rate scales with the time between rewards, not the number of cue–reward pairings, meaning total learning in a fixed period depends on timing. Dopamine signals tracked this time-based rule across appetitive and aversive conditioning, challenging traditional trial-based models and suggesting broader implications for biology and AI.
Your workouts may prime your brain chemistry, not just your muscles
A 12-week aerobic training program in sedentary adults increased the acute release of brain-derived neurotrophic factor (BDNF) after hard workouts and altered activity in the prefrontal cortex during attention and inhibition tasks. While participants improved their cardiovascular endurance and showed brain signaling changes linked to efficiency, there was no significant improvement in cognitive test scores. The study highlights a potential mechanism by which fitness supports brain function, though it relies on small sample size and maximum-exertion exercise, with serum vs plasma measurements providing different perspectives on BDNF delivery.
Wisdom steers creativity toward prosocial action, study finds
A PsyPost study across two large samples finds wisdom acts as a moral regulator for creativity: in low-wisdom individuals, higher creativity predicted lower willingness to help others, while high-wisdom individuals showed creativity linked with greater social mindfulness and prosocial tendencies; results suggest wisdom is key to steering creativity toward socially constructive ends, with intelligence showing less alignment.
Smart men less tied to traditional politics, study finds
A long-running German study of gifted (IQ 130+) and non-gifted adults shows they largely share the same political views, with one gender-based exception: non-gifted men score higher on conservatism than gifted men, while women show no difference. The results support cognitive-flexibility and centering ideas, suggesting high intelligence does not predict radical politics, though the study’s small sample and Germany-specific context limit generalizability.
Smart minds may misread mental health tests
Two large US datasets show standard mental health surveys may mismeasure distress in highly intelligent people because the questions do not function the same across IQ levels (a lack of measurement invariance). An initial nonlinear pattern suggested mental health improves with intelligence up to a point before declining, but advanced analyses indicate the test items lose diagnostic power at high IQ, casting doubt on conclusions about the mental health of the gifted and underscoring the need for assessments designed for highly intelligent individuals.