Our brain is plastic: it changes and adapts in response to our environment. While some circuits in our brain remain plastic during our whole life, others are capable of plasticity only at a certain age, and for a limited amount of time. These confined periods of intense development are called critical periods. Through the example of the visual system, we will explore the concept of critical periods in the brain, how they were discovered, what causes them, and how they contribute to the brain development in health and pathology.

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