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The biological meaning of eye pupil size is a subject of intense research. This study shows that pupil fluctuations reveal information about hypothalamic orexin cells, which control pupil size via a noradrenaline neural circuit.
Using depth electrodes in human patients, scientists at the Mayo Clinic found that the map of the body in motor cortex extends deep into the central sulcus. Unexpectedly, the nonsomatotopic ‘Rolandic motor association’ (RMA) area interrupts this organization.
This study mapped the developmental trajectory of transmission speed in the human brain by using electrical pulses and intracranial recordings. The authors found that these pulses travel with increasing speeds up to at least the age of 30.
