pavlov's experiment on the dog conditional mechanisms with food and bell

study infographic bell cartoon behaviour diagram procedure reaction comparison graphic digestion psychology explanation training isolated classical dog conditioned science response process pavlov experiment scientific laboratory food reflex health test chemistry vector research experience sign icon scientist education symbol unconditioned conditioning saliva neutral stimulus biology behavior behavioral 39aph39 conditional mechanisms labeled pavlovian respondent learn scheme salivation psychological educational pet font brand toy animal mammal play clothing footwear advertising person comics poster figurine adult