Daily Neuroscience for 21 April follows 4 stories from r/neuro and r/neuroscience, moving through microgravity motor prediction, astrocyte blood flow, infant walking genetics, social neural sync.

1. Microgravity Motor Prediction

Scientific American reports on a new Journal of Neuroscience study suggesting that astronauts' brains do not fully adapt to microgravity, even after months in orbit. The researchers studied 11 astronauts aboard the International Space Station for at least five months and found that they moved more slowly and gripped objects more firmly in weightlessness, as if those objects were still heavy.

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2. Astrocyte Blood Flow

A PNAS paper is drawing attention for showing that raising cAMP inside astrocytes can dilate brain blood vessels even when the usual calcium signal is not involved. The post argues that this points to a direct astrocyte role in controlling cerebral blood flow, not just a passive support role for neurons.

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3. Infant Walking Genetics

This story is about a Nature study on when infants first start walking, based on a large genome-wide association meta-analysis. The researchers analyzed more than 70,000 European-ancestry infants and found 11 genome-wide significant loci, suggesting that walking age is shaped by many small genetic effects rather than a single dominant one.

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4. Social Neural Sync

A PNAS journal club post points to a Nature study on how social interaction lines up activity in mouse brains and in artificial intelligence agents. In the mouse experiments, researchers recorded neurons in the dorsomedial prefrontal cortex and split the activity into a shared neural subspace and a unique one.

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That is today's Daily Neuroscience, with a reminder that early findings are useful signals, not final answers.