+A [Stimulus](/wiki/Stimulus) (plural: stimuli) is any detectable external or internal [Change](/wiki/Change) that can elicit a [Response](/wiki/Response) in an organism. They act as signals, prompting a biological or behavioral reaction.
+## See also
+- [Perception](/wiki/Perception)
+- [Sensation](/wiki/Sensation)
+- [Input](/wiki/Input)
... 1 more lines