What behavior is characterized by excessive verbal communication and is associated with stimulant use?

The behavior characterized by excessive verbal communication, particularly when associated with stimulant use, is talkativeness. Stimulants, such as amphetamines or cocaine, lead to heightened energy levels and increased sociability. This results in individuals often becoming more loquacious than usual, engaging in rapid speech and showing a need to communicate frequently. The stimulation effect encourages them to share thoughts and feelings more openly and exuberantly, which can manifest as a significant increase in verbal output. This behavior is distinct from the other options, as restlessness describes physical agitation, apathy signifies a lack of interest or energy, and withdrawal refers to a retreat from social interactions, none of which directly relate to increased talking associated with stimulant use.