Humans born blind or kittens raised under restricted conditions do not have cortical regions needed to interpret visual stimuli. Sensory restriction does not appear to do damage if it occurs later in life. This suggests what?

A critical period exists for normal perceptual development  

Explanation:

Perceptual development is related to the development of the five senses in human beings.

These are the five senses that develop in human beings. These senses are very important to us. These senses help the person in smell, taste the things, to watch and to hear the sounds. There is a critical period that exists in the development of perceptual sense in human beings s well as in kittens.

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