Answer:
Phineas Gage's similarity to an adolescent lies in the fact that both experiences changes in their behavior due to changes in their brain development. Adolescents undergo a significant amount of brain development, particularly in the prefrontal cortex, which affects their decision-making and impulse control.
Phineas Gage's brain injury damaged his prefrontal cortex, leading to changes in his personality, behavior, and decision-making abilities. Both adolescents and Phineas Gage experienced changes in their behavior due to changes in their brain structure and function.