Four experiments using barpress conditioned suppression in rats found that tone evoked more freezing (immobility) than did light. Still, tone and light appeared to have similar conditioned value as assessed by suppression in Experiments 1, 2, and 3, and by blocking, second-order conditioning, and overconditioning assays in Experiments 1, 2, and 3, respectively. Experiment 4 arranged for tone to evoke less suppression than light but more freezing. Results suggest that in fear conditioning, the nature of the conditioned stimulus affects the form of conditioned responding (strong vs. weak freezing). This conclusion extends one drawn by P. C. Holland (1977) on the basis of his work in appetitive conditioning.
|Original language||English (US)|
|Number of pages||18|
|Journal||Journal of Experimental Psychology: Animal Behavior Processes|
|State||Published - 1996|
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Experimental and Cognitive Psychology