Which effect do depressants typically have on a person?

Depressants are substances that primarily function by slowing down the central nervous system's activity. This results in a decrease in the brain's overall function, leading to effects such as reduced anxiety, sedative effects, and relaxation. Common examples of depressants include alcohol, benzodiazepines, and barbiturates. When someone consumes a depressant, they may experience diminished cognitive and motor functions, which can manifest as drowsiness and impaired coordination.

The other choices reflect effects that are not characteristic of depressants. Stimulation of the central nervous system typically describes the action of stimulants rather than depressants. Claiming that depressants have no effect contradicts the well-documented impacts these substances have on mental and physical states. Lastly, enhancing sensory perception is generally associated with hallucinogens or some stimulants, rather than the sedative effects associated with depressants. Thus, the slowdown of brain function is the hallmark of how depressants operate on the body and mind.