I feel the need to go beyond shiv.
A stimulus is an event which is perceived by a detector (for example a sense organ), which in turn may cause a reaction. The list of stimuli is long, but includes heat, light, cold, touch, sound, chemicals (for smell and taste) John H
Warning: contains random burst of energy, may burst out into song when unnecessary, does stupid things to humor people, may IM many people on your computer with her facebook account, and is addicted to spending time online. If you have the following side effects you may want to consult your closest friends for help: constant midnight cravings, severe partying, addiction to Starbucks, or enjoying life at its fullest. Have fun with your new best friend! Hehe, yeah. I'm crazy. Deal with it.
