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The Journal of Neuroscience, January 26, 2005, 25(4):830-835; doi:10.1523/JNEUROSCI.4716-04.2005

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BRIEF COMMUNICATION
Consolidation and Reconsolidation of Incentive Learning in the Amygdala

Szu-Han Wang,^1 * Sean B. Ostlund,^2 * Karim Nader,¹ and Bernard W. Balleine²

¹Department of Psychology, McGill University, Montreal, Quebec, Canada H3A 1B1, and ²Department of Psychology and the Brain Research Institute, University of California, Los Angeles, Los Angeles, California 90095-1563

Incentive learning is the process via which animals update changes in the value of rewards. Current evidence suggests that, for food rewards in rats, this learning process involves the amygdala. However, it remains unclear whether this learning undergoes protein synthesis-dependent consolidation and "reconsolidation" processes in the lateral and basal nuclei of amygdala. Accordingly, we examined this hypothesis by local infusion of protein-synthesis inhibitor after devaluation of a food reward induced by a shift from a food-deprived to a food-sated state in an instrumental conditioning paradigm. Our results show that intra-amygdala infusions of anisomycin, whether given after the initial devaluation or after a second devaluation session, abolished the changes in the value of the food reward produced by incentive learning. This study provides direct evidence that instrumental incentive learning depends on protein synthesis within the amygdala for both consolidation and reconsolidation and extends the demonstrations of protein synthesis-dependent reconsolidation to reward-related memories.

Key words: basolateral amygdala; incentive motivation; memory reconsolidation; protein synthesis; instrumental conditioning; rat

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Received Sep 21, 2004; revised December 5, 2004; accepted December 6, 2004.

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