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Instantaneous and Cumulative Influences of Competition on Impulsive Choices in Domestic Chicks


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タイトル: Instantaneous and Cumulative Influences of Competition on Impulsive Choices in Domestic Chicks
著者: Amita, Hidetoshi 著作を一覧する
Matsushima, Toshiya 著作を一覧する
キーワード: inter-temporal choices
social facilitation
social foraging
work investment
foraging effort
operant conditioning
nucleus accumbens
発行日: 2011年 9月
出版者: Frontiers Research Foundation
誌名: Frontiers in Neuroscience
巻: 5
開始ページ: 1
終了ページ: 8
出版社 DOI: 10.3389/fnins.2011.00101
抄録: This study examined instantaneous and cumulative effects of competitive interactions on impulsiveness in the inter-temporal choices in domestic chicks. Chicks were trained to peck colored beads to gain delayed food rewards (1 or 6 grains of millet delivered after a delay ranging between 0 and 4.5 s), and were tested in binary choices between a small–short delay option (SS) and a large–long delay alternative (LL). To examine whether competitive foraging instantaneously changes impulsiveness, we intraindividually compared choices between two consecutive tests in different contexts, one with competitors and another without. We found that (1) the number of the choice of LL was not influenced by competition in the tests, but (2) the operant peck latency was shortened by competition, suggesting a socially enhanced incentive for food. To further examine the lasting changes, two groups of chicks were consecutively trained and tested daily for 2 weeks according to a “behavioral titration” procedure, one with competitors and another without. Inter-group comparisons of the choices revealed that (3) choice impulsiveness gradually decreased along development, while (4) the chicks trained in competition maintained a higher level of impulsiveness. These results suggest that competitive foraging causes impulsive choices not by direct/contextual modification. Causal link between the instantaneous enhancement of incentive and the gradual effects on impulsiveness remains to be examined. Some (yet unspecified) factors may be indirectly involved.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 松島 俊也


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