Document Detail

Subjective value of risky foods for individual domestic chicks: a hierarchical Bayesian model.
MedLine Citation:
PMID:  19921287     Owner:  NLM     Status:  MEDLINE    
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.
Ai Kawamori; Toshiya Matsushima
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-11-17
Journal Detail:
Title:  Animal cognition     Volume:  13     ISSN:  1435-9456     ISO Abbreviation:  Anim Cogn     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-04-13     Completed Date:  2010-07-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9814573     Medline TA:  Anim Cogn     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  431-41     Citation Subset:  IM    
Laboratory of Animal Behavior and Intelligence, Department of Biology Faculty of Science, Hokkaido University, Kita 10, Nishi 8, Sapporo 060-0810, Japan.
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MeSH Terms
Bayes Theorem
Chickens / physiology*
Feeding Behavior / physiology,  psychology*
Markov Chains
Maze Learning / physiology
Time Factors

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