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In physiology, a stimulus is a detectable change in the internal or external environment. When a stimulus is applied to a sensory receptor, it elicits or influences a reflex via stimulus transduction. A stimulus is often the first component of a homeostatic control system. When a sensory nerve and a motor nerve communicate with each other, it is called a nerve stimulus. In psychology, a stimulus is part of the stimulus-response relationship of behavioural learning theory.
See also
In Simple words w can define the stimulus as "A stimulus is a function which generates some action"
