Stimulus

A stimulus is something that causes a physiological response. It may refer to:


 * Stimulation
 * Stimulus (physiology), something external that influences an activity
 * Stimulus (psychology), a concept in behaviorism and perception
 * Stimulus (economics)
 * For government spending as stimulus, see Fiscal policy
 * For an increase in money designed to speed growth, see Monetary policy
 * The input to an input/output system, especially in computers