What indicator is associated with amphetamine use?

Amphetamine use is often characterized by increased energy and alertness, which can lead to heightened talkativeness in individuals. This stimulant drug enhances neurotransmitter activity in the brain, particularly dopamine and norepinephrine, leading to euphoria, increased sociability, and a tendency to engage in rapid or excessive conversation. This behavior is typically noticeable and is a common sign of amphetamine use.

The other choices do not align with the usual effects associated with amphetamines. Increased appetite is typically not an effect; rather, amphetamines are more often associated with decreased appetite. Chronic fatigue contradicts the stimulating effects of amphetamines, which generally boost energy levels. Blurred vision can occur with various substances or conditions but is not a primary indicator of amphetamine use. Therefore, the increased talkativeness serves as a clear behavioral indicator associated with this type of substance use.