Final answer:
Gavin's experience of feeling queasy at the sight of boats, after being seasick while deep-sea fishing, is an example of Classical conditioning, where the boat has become a conditioned stimulus associated with nausea.
Step-by-step explanation:
The situation described with Gavin who recently went deep-sea fishing and now feels queasy at the sight of boats is an example of Classical conditioning. In classical conditioning, an individual develops a conditioned response to a previously neutral stimulus after the stimulus has been associated with an unconditioned stimulus that naturally prompts a reflexive response. In Gavin's case, the boat (neutral stimulus) became associated with seasickness (unconditioned stimulus), so now the sight of the boat alone (conditioned stimulus) triggers a sense of nausea (conditioned response).