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- Title
Emotional environments retune the valence of appetitive versus fearful functions in nucleus accumbens.
- Authors
Reynolds, Sheila M.; Berridge, Kent C.
- Abstract
The nucleus accumbens mediates both appetitive motivation for rewards and fearful motivation toward threats, which are generated in part by glutamate-related circuits organized in a keyboard fashion. At rostral sites of the medial shell, localized glutamate disruptions typically generate intense appetitive behaviors in rats, but the disruption incrementally generates fearful behaviors as microinjection sites move more caudally. We found that exposure to stressful environments caused caudal fear-generating zones to expand rostrally, filling ∼90% of the shell. Conversely, a preferred home environment caused fear-generating zones to shrink and appetitive-generating zones to expand caudally, filling ∼90% of the shell. Thus, the emotional environments retuned the generation of motivation in corticolimbic circuits.
- Subjects
NUCLEUS accumbens; LIMBIC system; GLUTAMIC acid; BRAIN; CENTRAL nervous system
- Publication
Nature Neuroscience, 2008, Vol 11, Issue 4, p423
- ISSN
1097-6256
- Publication type
Article
- DOI
10.1038/nn2061