Operant is a type of behaviorism. Behaviorism is a school of thought that focuses on the behavior of animals and humans.
A physiologist is a scientist who studies the body and how it functions. They often study things like the heart, lungs, and digestive system.
Salivate is to drool or to produce saliva. When you salivate, you are drooling or producing saliva.
An unconditioned stimulus is something that is not usually associated with a certain response. For example, a bell might be an unconditioned stimulus, because it's usually associated with the sound of the bell being rung.
Salivation is the secretion of saliva from the mouth. It is often a sign of excitement or anxiety.
Veggies are fruits and vegetables. These are the foods that are typically considered to be healthy, because they contain a lot of vitamins and minerals.
A connoisseur is someone who is very experienced in a particular field. They can often tell the difference between good and bad art, or between a good wine and a bad wine.
Pigeons are birds that are usually used for transportation. They are usually found in large groups, and they can fly very fast.
A reinforcement is something that helps to encourage or motivate someone. It can be anything from a positive comment to a gift.