論文

2020年11月30日

Computerized intertemporal choice task in chimpanzees (Pan troglodytes) with/without postreward delay.

Journal of Comparative Psychology
  • Yutaro Sato
  • ,
  • Yutaka Sakai
  • ,
  • Satoshi Hirata

135
2
開始ページ
185
終了ページ
195
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1037/com0000254
出版者・発行元
American Psychological Association ({APA})

In intertemporal choice (ITC) tasks, animals are presented with alternative choices between a smaller reward that becomes available sooner and a larger reward that becomes available later. To equate the duration of a trial across the 2 options, postreward delays (PRDs) are inserted after the delivery of the reward. Animals need to incorporate this to increase the long-term reward rate. However, recent studies suggest that they have difficulty understanding the contingency associated with PRDs. Previous research indicates that chimpanzees exhibit particularly great self-control in ITC tasks, but it remains unclear whether chimpanzees do so when considering PRDs. Therefore, we used touchscreen experiments to explore chimpanzee intertemporal preferences when trial duration was equated by a PRD as well as when the PRD was eliminated. The computerized setting was used to try to control delay length flexibly and precisely while reducing the impact of the interaction with human experimenters. Moreover, choice options were presented on touchscreens using symbolic cues. This may reduce the impact of seeing food rewards on making a choice (i.e., the animals' robust tendency to reach for the larger amount of food). In an ITC task in which the trial duration was equated, 4 chimpanzees preferred larger rewards but chose smaller rewards more often when the ratio of the reward amount was smaller. In an ITC task with no PRDs, 2 of 4 chimpanzees did switch their preference to smaller rewards and enhanced the reward rate although this result should be interpreted in light of some methodological limitations.


リンク情報
DOI
https://doi.org/10.1037/com0000254
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000668221900006&DestApp=WOS_CPL
ID情報
  • DOI : 10.1037/com0000254
  • ISSN : 0735-7036
  • eISSN : 1939-2087
  • ORCIDのPut Code : 84390976
  • Web of Science ID : WOS:000668221900006

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