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Subjective value of risky foods for individual domestic chicks: a hierarchical Bayesian model

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タイトル: Subjective value of risky foods for individual domestic chicks: a hierarchical Bayesian model
著者: Kawamori, Ai 著作を一覧する
Matsushima, Toshiya 著作を一覧する
キーワード: Risk
Bayesian estimation
発行日: 2010年 5月
出版者: Springer
誌名: Animal Cognition
巻: 13
号: 3
開始ページ: 431
終了ページ: 441
出版社 DOI: 10.1007/s10071-009-0293-1
抄録: For animals to decide which prey to attack, the gain and delay of the food item must be integrated in a value function. However, the subjective value is not obtained by expected profitability when it is accompanied by risk. To estimate the subjective value, we examined choices in a cross-shaped maze with two colored feeders in domestic chicks. When tested by a reversal in food amount or delay, chicks changed choices similarly in both conditions (experiment 1). We therefore examined risk sensitivity for amount and delay (experiment 2) by supplying one feeder with food of fixed profitability and the alternative feeder with high- or low-profitability food at equal probability. Profitability varied in amount (groups 1 and 2 at high and low variance) or in delay (group 3). To find the equilibrium, the amount (groups 1 and 2) or delay (group 3) of the food in the fixed feeder was adjusted in a total of 18 blocks. The Markov chain Monte Carlo method was applied to a hierarchical Bayesian model to estimate the subjective value. Chicks undervalued the variable feeder in group 1 and were indifferent in group 2 but overvalued the variable feeder in group 3 at a population level. Re-examination without the titration procedure (experiment 3) suggested that the subjective value was not absolute for each option. When the delay was varied, the variable option was often given a paradoxically high value depending on fixed alternative. Therefore, the basic assumption of the uniquely determined value function might be questioned.
Rights: The final publication is available at
資料タイプ: article (author version)
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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