ABSTRACT
When two instrumental reactions to two different intermittent conditioned stimuli, respectively, were trained in one situation, each conditioned stimulus (CS) often elicited the reaction related to the other CS, or both instrumental reactions. An application of the CS in the homogeneous situation, evoked general alimentary or defensive behaviors. An application of the CS in the heterogeneous situation in which an alimentary CS was tested in a defensive situation, and vice versa, a defensive CS was tested in an alimentary situation, evoked a general conditioned reaction, and only in a few cases, a correct instrumental reaction appeared to the tested stimulus. The performance of the general behavior related to the previously used procedures, indicates that the intermittent CS retains its classical (Pavlovian) connections with the unconditioned stimulus, even when it is tested in a different situation. Conditioned-reflex memory presumably depends on the structural development of synaptic mechanisms.
