Reacquisition, reinstatement, and renewal of a conditioned taste aversion in preweanling rats

Pavlovian extinction is defined as a reduction of the conditioned response (CR) as a consequence of repeated and nonreinforced presentations of the conditioned stimulus (CS). This phenomenon has been explained through two nonexclusive associative hypotheses. One of them proposes that the CS–unconditioned stimulus (US) association is weakened during extinction, while the second one explains extinction by the formation of a new inhibitory...