According to the Focus on Neuroscience box on the adolescent brain, the most likely explanation for impulsive and erratic behavior in adolescence is immaturity of the prefrontal cortex.

Question

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The prefrontal cortex is responsible for executive functions such as decision-making, impulse control, and planning. As it continues to develop in adolescence, immature functioning may lead to impulsive and erratic behavior.

According to the Focus on Neuroscience Box on the Adolescent