A stimulus is something that causes a 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

See also

• Stimulus bill (disambiguation), in economics

• Economic Stimulus Act of 2008, United States

• 2008 Chinese economic stimulus plan

• 2008 European Union stimulus plan

• American Recovery and Reinvestment Act of 2009

• Stimulus Package, an add-on for the video game Modern Warfare 2