NCIt definition : Generally refers to relative simple learning situations in which a stimulus initially
incapable of evoking a certain response acquires the ability to do so by repeated
pairing with another stimulus that does elicit the response.;
Alternative definition : NCI-GLOSS: A type of learning in which repeated exposure to something may affect a
person's behavior when they encounter an unrelated object, sound, or smell that occurred
at the same time as the initial exposure. For example, a patient who always feels
sick after receiving chemotherapy in a clinic that smells a certain way may be conditioned
to feel sick when smelling the same odor in a different place.;