The brain is particularly plastic during critical periods of early development. You might have noticed that kids learn very fast, but they also forget almost as quickly. Retaining knowledge in the early age is difficult — when the system constantly changes in the search for the most important signals. That is why repetition of the new material is key for children’s learning. How many times have you heard kids being asked: “What does the cat say?”.
Plasticity becomes less prominent as the biological system stabilises, we become more dependent on the learnt knowledge and operate from experience. Nevertheless the brain preserves a certain degree of plasticity for adaptation and reorganisation at smaller scales.
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