Final answer:
The symptoms of ADHD, such as poor sustained attention and impulsivity, are believed to originate from dysfunction in the prefrontal cortex.
Step-by-step explanation:
The symptoms of ADHD, such as poor sustained attention and impulsivity, are believed to originate from dysfunction in the pREFRONTAL CORTEX. This region of the brain is responsible for executive functions, including attention, planning, and impulse control. Dysfunction in the prefrontal cortex can lead to difficulties in sustaining attention and managing impulsive behaviors, which are characteristic symptoms of ADHD.