Question

In 2003, this researcher suggested that adolescents have difficulty controlling their emotions, because their prefrontal cortex has not yet fully developed.

Answer 1

Charles Nelson has suggested this.

Explanation - According to the research done by Charles Nelson adolescents face difficulty in controlling emotions because their prefrontal cortex has not yet fully developed. The prefrontal cortex (PFC) is the cerebral cortex which covers the front part of the frontal lobe. This region of brain has implications in planning personality expression, complex cognitive behavior, decision making, and moderating social behaviour. That's why adolescents face difficulty in controlling their emotions.