ERIC Number: EJ943954
Record Type: Journal
Publication Date: 2011-Oct
Abstractor: As Provided
Reference Count: 0
Dorsal and Dorsal and Ventral Striatal Protein Synthesis Inhibition Affect Reinforcer Valuation but Not the Consolidation of Instrumental Learning
Jonkman, Sietse; Everitt, Barry J.
Learning & Memory, v18 n10 p617-624 Oct 2011
The evidence for a role of the striatum in the acquisition of uncued instrumental responding is ambiguous. It has been shown that post-session infusions of anisomycin into the core of the nucleus accumbens (NAcc) impaired instrumental acquisition, but pre-training lesions of the NAcc suggest that it is not necessary. Recently, we demonstrated that the infusion of anisomycin into the anterior cingulate cortex impaired instrumental acquisition indirectly through a taste aversion. Thus, we hypothesized that post-session anisomycin infusions into the NAcc affected instrumental acquisition through an effect on reinforcer valuation. For the dorsal striatum, both post-session infusions of anisomycin and pre-training lesion studies suggest that neither the dorsolateral nor the dorsomedial striatum is necessary for the acquisition of instrumental responding. However, it has not been attempted to block plasticity in both regions concurrently, and we hypothesized that both regions independently contribute to acquisition through goal-directed and habitual learning. In the current experiments, we first replicated the effect of unprotected post-session anisomycin infusions into the NAcc on instrumental acquisition. Subsequently, we investigated the effect of protein synthesis inhibition in the NAcc and dorsomedial and dorsolateral striatum concurrently on instrumental acquisition, critically controlling for effects on reinforcer valuation. The anisomycin infusions induced an aversive state, but did not affect instrumental acquisition.
Descriptors: Evidence, Inhibition, Brain Hemisphere Functions, Reinforcement, Role, Learning Processes, Drug Use, Neurological Impairments, Sensory Experience, Habituation
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Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
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