Sniffy, The Virtual Rat, Version 4.5, Macintosh

Sniffy (a digital rodent that mimics a caged rat) helps students learn the principles of operant conditioning with all the benefits of using a live rat and none of the drawbacks. Starting with Sniffy pacing around its barren box, the student gradually trains the rat to press a bar above a food dispenser. An average student will take about 40 minutes to train Sniffy and will get the same sort of insights out of the screen version as they do out of the live one.