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Critical periods of development refer to times when genetic or materal effects can impact upon the developmental process. The timing of these effects will impact on different systems at different times.
In humans, critical periods are extended over years and there are different critical periods for different brain functions (for example binocular vision or language acquisition) and unless a certain function is learned during this period, the function will remain poor.Diagram Human Critical Periods Image Diagram - Chart - diagrams and charts with labels. This diagram depicts Diagram Human Critical Periods Image