TL;DR: Pooling 114 brain-scan studies, researchers found that grammar and arithmetic both lit up four spots on the left side of the brain, all part of a general problem-solving network. Beyond that, each skill leaned on its own separate regions. Key Findings 114 fMRI studies: 48 on grammar, 66 on arithmetic, in healthy children and …
TL;DR: A 2026 rat study in Hippocampus found that the dentate gyrus (DG), a hippocampal memory region, gained about 385,000 granule neurons from 2 to 18 months of age even though older development-born neurons were also being lost. Key Findings 385,000-cell net gain: Total DG granule neuron counts increased by about 385,000 cells from 2 …
TL;DR: A 2026 study in The British Journal of Psychiatry found that psychiatrists described parental profession as shaping psychiatry career choice mainly through role modeling, family values, autonomy, guidance, and lived experience with mental health. Key Findings Qualitative sample: Researchers analyzed reflective questionnaire responses from 45 doctors working in child and adolescent psychiatry and 24 …
TL;DR: A 2025 study in The Journal of General Psychology found that introductory psychology textbooks showed modest improvement from 2018 to 2023, but several classic myths and contested topics were still presented in biased or oversimplified ways. Key Findings Researchers rated coverage of 11 textbook topics that psychology professors had flagged as commonly distorted or …
TL;DR: A 2026 systematic review and meta-analysis posted as a medRxiv preprint found that mindfulness-based programs were linked to a small improvement in executive function, meaning inhibition, working memory, and flexible thinking, across 13 youth trials. Key Findings 13 trials were included: The meta-analysis pooled randomized and quasi-randomized trials in 1,560 children and adolescents aged …
TL;DR: A 2026 preprint neurosurgery neuroplasticity study in medRxiv found that language-targeted prehabilitation selectively changed language-network topography, while language and cognitive performance were preserved after the intervention. Key Findings Study type: a prehabilitation study using neuromodulation, language training, task-based functional MRI (fMRI), and neuropsychological testing. People studied: 26 patients with operable brain tumors affecting language …
TL;DR: A 2026 Journal of Intelligence study of 170 adults found that math ability and music ability were only weakly related, and the link was reduced to almost zero after researchers accounted for general intelligence. Key Findings Adult ability groups were tested: The 170-person sample included math specialists, music specialists, and controls who did not …
TL;DR: A 2026 study in Scientific Reports used the German TwinLife panel (228 monozygotic and 212 same-sex dizygotic twin pairs) to show that intelligence quotient (IQ) at age 23 predicted four socioeconomic status (SES) outcomes at age 27, with genetic factors explaining 69-98% of the IQ-SES association. Key Findings IQ at age 23 predicted SES …
Daily Cognitive Precision Predicted Goal Follow-Through TL;DR: Sharper-than-usual cognitive days predicted same-day follow-through: a one-standard-deviation jump in precision translated to roughly 40 extra minutes of goal-directed work. Key Findings Sharper days predicted follow-through: The study followed university students intensively rather than comparing high- and low-performing people once. 9,248 daily time points: Microtasks measured fluctuations in …
Cannabis Did Not Just Blur Word Lists. It Hit Everyday Memory Too TL;DR: A randomized vaporized-THC trial found broad acute memory impairment, including false memories, prospective memory, source memory, and temporal order memory, with no meaningful dose split between 20 and 40 mg. Key Findings 120 regular cannabis users randomized: Participants vaporized placebo cannabis, 20 …
