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A stimulus is the following:
- In physiology, a stimulus (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.
- In general, a stimulus may affect other things than living creatures; for example, one speaks also of economic stimulus, or stimulating a discussion.
See also
response, stimulus-response model.
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