Abstract
The conditioned emotional response (CER) and basal emotional level (BEL) were studied as a function of predictability and escapability of an electric shock in a conditioned suppression situation using 32 rats. One group of rats could escape shock by responding into an escape-space upon receiving shock which was signaled. The other two groups were yoked with the above group with respect to shock experience. But for one of them, shock was unsignaled. There was no significant difference between the two signaled groups with respect to CER. As to BEL, the signaled escapable group was the lowest, the signaled-inescapable group was next, and the unsignaled-inescapable group was the highest and the differences were all significant.