What is a key characteristic of someone under the influence of depressants?

Individuals under the influence of depressants often exhibit uncoordinated movements, which is a hallmark characteristic of how these substances affect the central nervous system. Depressants slow down brain activity and impair motor skills by disrupting communication between the brain and the body. This decreased coordination can lead to clumsiness, difficulties with balance, and problems with fine motor skills, making it challenging for a person to perform tasks that require physical control.

The other choices, while they may seem plausible in certain contexts, do not align with the typical effects of depressants. Increased physical activity and incessant talking are more commonly associated with stimulants, as these substances tend to elevate energy levels and verbal output. Heightened sensory perception is also not a characteristic of depressants; rather, it is often a feature related to hallucinogens or certain stimulants. Therefore, uncoordinated movements stand out as the key characteristic associated with the influence of depressants.