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Stimulus

Reviewed By David C. Dugdale III, MD, Professor of Medicine, Division of General Medicine, Department…more »

Definition

A stimulus is anything that can trigger a physical or behavioral change. The plural of stimulus is stimuli.

Stimuli can be external (a patient responds to a medication) or internal (a patient’s vital signs change due to a change in a bodily system).

Examples of stimuli include irritants, sights, sounds, heat, cold, smells, or other sensations.

Date Last Reviewed: 02/23/2009
Copyright: ADAM Health Illustrated Encyclopedia

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