Which of the following symptoms is associated with CNS stimulant use?

A talkative demeanor is a definitive symptom associated with the use of central nervous system (CNS) stimulants. These substances, such as amphetamines and cocaine, typically increase levels of neurotransmitters like dopamine and norepinephrine in the brain, leading to heightened alertness, energy, and a propensity to engage more in conversation. Users often exhibit increased sociability and may talk excessively or rapidly as part of their heightened state of arousal and energy.

In contrast, decreased blood pressure and bradycardia are generally associated with depressants rather than stimulants, as CNS stimulants typically cause an increase in heart rate and blood pressure. Muscle rigidity, too, is not a common symptom of stimulant use but is more often connected with certain other conditions or drug types. This context emphasizes the importance of recognizing the specific effects of different categories of substances on human physiology and behavior.