Stimulus

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Stimulus (plural: stimuli) may refer to:

Stimulus (physiology), in physiology, is something external that elicits or influences a physiological or psychological activity or response
In psychology, anything effectively impinging upon any of the sensory apparatuses of a living organism, including physical phenomena both internal and external to the body.
Stimulation, the action of various agents (stimuli) on muscles, nerves, or a sensory end organ
In other fields, a stimulus is anything that may have an impact on a system; an input to the system. (E.g., an economic stimulus.)

Although related, the word's meaning is distinct from that of "stimulant."

See also