FIGURE 3.5. (See Color Insert) Conditioned modulation of approach behaviour by aversive stimulation.


(See Color Insert) Conditioned modulation of approach behaviour by aversive stimulation. Rats were placed in a cage with a grid floor and shocked, and alternately into a discriminable cage and not shocked. On the next 2 days the rats were given a total of 10 training trials in a Y-maze. On each trial one arm was blocked and the rats were forced to run to the other arm. They ran to the food and no-food arms five times each; the last run was always to the food arm. After a 5 min delay, the rats in the experimental group were placed into the shock cage without receiving shock (the conditioned context) for 10 min. The rats in the control group were placed into the no-shock context. Another group of each type was placed into the contexts after a 2 hr delay. Then next day all rats were given a Y-maze test with no barriers or food on the maze in order to compare their memory for the location of the food. The rats in the 5 min delay group that had been exposed to the conditioned context made significantly more correct responses than the rats that had been placed into the control context. Context placement had no effect in the 2 hr delay group. See text for discussion of how this finding demonstrates post-training modulation by a conditioned reinforcer (instead of a reinforcer) and how it shows that modulation does not depend on the affective properties of the post-training treatment. (Results based on Holahan, M. R., White, N. M, Behavioral Neuroscience 118, 24, 2004.)

From: Chapter 3, Reward: What Is It? How Can It Be Inferred from Behavior?

Cover of Neurobiology of Sensation and Reward
Neurobiology of Sensation and Reward.
Gottfried JA, editor.
Boca Raton (FL): CRC Press/Taylor & Francis; 2011.
Copyright © 2011 by Taylor and Francis Group, LLC.

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