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Competitor suppresses neuronal representation of food reward in the nucleus accumbens/medial striatum of domestic chicks
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Title: | Competitor suppresses neuronal representation of food reward in the nucleus accumbens/medial striatum of domestic chicks |
Authors: | Amita, Hidetoshi Browse this author | Matsushima, Toshiya Browse this author →KAKEN DB |
Keywords: | Choice | Impulsiveness | Operant latency | Pseudo-competition | Social foraging |
Issue Date: | 15-Jul-2014 |
Publisher: | Elsevier |
Journal Title: | Behavioural Brain Research |
Volume: | 268 |
Start Page: | 139 |
End Page: | 149 |
Publisher DOI: | 10.1016/j.bbr.2014.04.004 |
PMID: | 24726841 |
Abstract: | To investigate the role of social contexts in controlling the neuronal representation of food reward, we recorded single neuron activity in the medial striatum/nucleus accumbens of domestic chicks and examined whether activities differed between two blocks with different contexts. Chicks were trained in an operant task to associate light-emitting diode color cues with three trial types that differed in the type of food reward: no reward (S−), a small reward/short-delay option (SS), and a large reward/long-delay alternative (LL). Amount and duration of reward were set such that both of SS and LL were chosen roughly equally. Neurons showing distinct cue-period activity in rewarding trials (SS and LL) were identified during an isolation block, and activity patterns were compared with those recorded from the same neuron during a subsequent pseudo-competition block in which another chick was allowed to forage in the same area, but was separated by a transparent window. In some neurons, cue-period activity was lower in the pseudo-competition block, and the difference was not ascribed to the number of repeated trials. Comparison at neuronal population level revealed statistically significant suppression in the pseudo-competition block in both SS and LL trials, suggesting that perceived competition generally suppressed the representation of cue-associated food reward. The delay- and reward-period activities, however, did not significantly different between blocks. These results demonstrate that visual perception of a competitive forager per se weakens the neuronal representation of predicted food reward. Possible functional links to impulse control are discussed. |
Rights: | ©2014. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/60464 |
Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 松島 俊也
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