What effect does amphetamine have on brain activity?

Amphetamine is a central nervous system stimulant that significantly increases certain types of brain activity. It works primarily by increasing the levels of neurotransmitters such as dopamine and norepinephrine in the brain. This heightened activity is associated with enhanced alertness, increased energy, and improved focus and concentration.

The stimulating effects of amphetamines are often utilized therapeutically for conditions like Attention Deficit Hyperactivity Disorder (ADHD) and narcolepsy, where increased brain function and concentration are beneficial. The impact on brain activity is characterized by increased arousal and heightened cognitive function, making the correct answer clear in the context of how amphetamines interact with the brain.