In four experiments with rats, we investigated the nature of the within-compound association that forms between taste and odor cues (CSs A and X) during compound flavor-aversion conditioning. Specifically, we investigated its bidirectionality, seeking evidence of both A → X and X → A associations. After AX+ conditioning (Experiments 1a and 1b), extinguishing one cue consistently weakened the aversion to the other. We then examined A+ /AX+ conditioning, where a strong aversion to X (augmentation) indicated an A → X association, and subsequent mediated extinction confirmed the X → A association. When odor was A and taste was X (Experiments 1a and 3), augmentation and mediated extinction were both observed, providing evidence for both associations. Yet, in Experiment 1b, when taste was A and odor was X, only odor augmentation was obtained. Considering relative salience of the cues can affect their interaction in compound, we downgraded the more salient taste in Experiment 2. Using a 60-min CS—US interval to weaken taste preconditioning, extinction of the augmented odor successfully produced mediated extinction of the taste. In Experiment 3, strong odor preconditioning failed to protect it from being weakened by extinction of the associated taste. Together, our results show that taste and odor form a bidirectional within-compound association during both AX+ and A+ /AX+ conditioning. Importantly, the expression of that within-compound association is critically dependent on which cue gains dominant control over behavior—a state determined by both stimulus identity and associative history.
扫码关注我们
求助内容:
应助结果提醒方式:
