New theory explains how critical periods are triggered during development of the nervous system

Experiments performed in the 1960s showed that rearing young animals with one eye closed dramatically altered brain development such that the parts of the visual cortex that would normally process information from the closed eye instead process information from the open eye. These effects can be induced only within a specific period of time—a
Experiments performed in the 1960s showed that rearing young animals with one eye closed dramatically altered brain development such that the parts of the visual cortex that would normally process information from the closed eye instead process information from the open eye. These effects can be induced only within a specific period of time—a 'critical' period during which the developing nervous system is particularly sensitive to its environment.

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Frontiers Shifting Developmental Trajectories During Critical Periods of Brain Formation

Sensitive and critical periods during neurotypical and aberrant neurodevelopment: A framework for neurodevelopmental disorders - ScienceDirect

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The menstrual rhythm of the brain. Research shows in the female brain, regions important for memory and perception are remodeled in the course of the menstrual cycle : r/science