THE EVOLUTION OF PERCEPTUAL FRAMES OF REFERENCE.
JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF PSYCHOLOGY
Pagination or Media Count:
The effect of applying shock, either to the feet or to the brain, prior to operant testing upon rate of responding for positive intracranial stimulation was studied in 29 animals. The pre-test shock was applied to some Ss in a setting closely resembling the operant chamber, to others in a markedly dissimilar setting. A control group never received prior shock. Both types of prior shock produced a facilitation of self-stimulation rate, which was identified as an instance of qualitative reinforcement contrast. However, the overall time course for this effect varied with type of pre-test shock for foot-shock it was enhanced from beginning to end of the average session for brain-shock it decreased. Pre-test shock also appeared to be more effective when administered in a similar than in a dissimilar chamber. Author