stimulant

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The rate-dependency principle states that the behavioral effects of psychomotor stimulants are inversely related to the frequency of behavior under control conditions: Low-rate operant behavior tends to increase, whereas high-rate operant behavior tends to decrease.
Several studies have assessed acute effects of psychomotor stimulants using various models of learning in nonhumans with somewhat mixed results.
Caffeine-one of the most widely used psychomotor stimulants in the world-it acts on the central nervous system and cardiovascular system by temporarily decreasing tiredness and increasing alertness.