cognitive-science26.715 min read
Brain uses a universal evidence-accumulation system for decisions, including new abstract rules
10 days ago•Source: PsyPost
Cognitive Science News
The latest cognitive science stories, summarized by AI
Featured Cognitive Science Stories
View original source
25.02 min•14 days ago
Twenty minutes of moderate exercise preserves automatic motor learning, study finds
A within-subject study of 26 healthy young adults found that a 20-minute session of moderate stationary cycling (keeping heart rate at 65–75% of max) prevented the typical rest-related decline in implicit sensorimotor adaptation and sped up overall response time. After cycling, participants’ implicit adaptation (post-rotation bias) remained near baseline (about 2.40–2.45°) compared with a drop after rest (2.20° from 2.93°), and total response time fell ~4% (555 ms to 532 ms), suggesting aerobic exercise primes the nervous system for automatic motor learning and rehabilitation.
More Top Stories
2
Narrow cognitive strengths can rival IQ in predicting socioeconomic success
PsyPost•1 month ago
3
Brain health can grow at any age with online training, new study finds
PsyPost•1 month ago
More Cognitive Science Stories
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.
Mind’s prime appears in late midlife, study suggests
A new analysis combining nine cognitive and personality domains finds that overall psychological functioning peaks in late midlife (around ages 55–60 in the comprehensive model, with a similar peak near 60 in the conventional model). While raw processing speed and certain cognitive functions decline with age, crystallized knowledge, conscientiousness, emotional stability, emotional intelligence, moral reasoning, and financial literacy can continue to improve, enabling older adults to maintain high functional capacity even as some abilities wane. The study cautions that cross‑sectional Western data limit universal conclusions and notes implications for leadership and policy roles, where midlife readiness may trump youth or old age, though more longitudinal and non‑Western research is needed.
Specific cognitive skills show strong, independent genetic influence beyond general intelligence
A large meta-analysis of 747,567 twin comparisons across 11 cognitive domains finds the average heritability of specific cognitive abilities is about 56%, slightly higher than general intelligence, with some domains above 60% (e.g., quantitative knowledge, reading/writing, processing speed) and others around 40% (e.g., fluid reasoning, short-term memory). After accounting for general intelligence, these specific abilities remain highly heritable, averaging about 53%, indicating distinct genetic influences beyond IQ. Development shows general intelligence heritability rises with age, while specific abilities follow a flatter trajectory; the study notes data gaps and measurement noise but envisions DNA-based profiling to tailor education and interventions.
Paper Reading Eases Brain Load Even in Manga, Neuroimaging Shows
A PLOS ONE study with 25 native Japanese speakers found reading manga on paper led to lower cognitive effort and different brain activation than reading on a tablet: paper readers showed reduced activity in left-hemisphere language areas during integration of the story’s second half, while tablet readers exhibited higher activity in those regions and in right frontal areas. Behaviorally, both groups answered complex questions with similar accuracy, but tablet readers were slower, suggesting that physical paper provides stable sensory anchors that ease narrative processing and memory. Limitations include focusing on manga and device differences like backlighting and page-turn dynamics; researchers plan to explore broader media formats and the effects of writing with pen vs. keyboard.
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.