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.

Frontiers Shifting Developmental Trajectories During Critical Periods of Brain Formation

The critical period for astrogenesis and synaptic circuit formation

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Neuron - Wikipedia

Frontiers Shifting Developmental Trajectories During Critical Periods of Brain Formation

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The brain's data compression mechanisms: Neurons subtract images and use the differences

llustrating the interaction of experience and maturation during

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Critical Period in Brain Development: Definition, Importance

Frontiers Epigenetic and Transcriptional Regulation of Spontaneous and Sensory Activity Dependent Programs During Neuronal Circuit Development

Critical Periods in Cortical Development - ScienceDirect