Plasticity has caused many researchers to replace the term "critical period" with "sensitive period".
A critical period is when something must happen to allow proper development, whereas a sensitive period is when a specific development is most highly probable but does not have to happen at that time. The potential of the nervous system to adjust its activity in reaction to external or internal stimuli by restructuring its structure, features, or connections is referred to as neural plasticity, also identified as neuroplasticity or brain plasticity.
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