Learning: a relatively durable change in behaviour or knowledge that"s due to experience. conditioning: learning associations between events that occur in an organism"s environment. classical conditioning: a type of learning in which a stimulus acquires the capacity to evoke a response that was originally evoked by another stimulus. did experiments on dogs, with meat powder (unconditioned stimulus) & a bell (conditioned stimulus); as soon as they heard the bell, they would create salivation. unconditioned stimulus: (meat powder & salivation) a stimulus that evokes an unconditioned response without previous conditioning. The unconditioned stimulus response is an unlearned reaction to an unconditioned stimulus that occurs without previous conditioning. conditioned stimulus: (bell & salivation) a previously neutral stimulus that has, through conditioning, acquired capacity to evoke a conditional response. The conditioned response is a learned reaction to conditioned stimulus that occurs because of previous conditioning.