Abstract
In transfer from shock escape to appetitively motivated training in a straight runway, 64 male hooded rats were given various pretreatments, or none, prior to transfer. With appropriate controls, running was motivated by high-intensity noise (120 dB) or shock (1 mA), by low-intensity shock (.2 mA), or by a second-order aversive excitatory stimulus prior to the elimination of those stimulus conditions and the initiation of food reinforcement. In general, all of the pretreatments produced extended suppression in the transfer condition. Controls for latent inhibition indicated none was present. High-intensity shock reduced eating on initial food reinforcement trials, but the other aversive conditions did not. The results were interpreted as possible consequences of stimulus-directive effects.
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