NDLI: Chimpanzees (Pan troglodytes) can wait, when they choose to: a study with the hybrid delay task

Content Provider	Springer Nature Link
Author	Beran, Michael J. Evans, Theodore A. Paglieri, Fabio McIntyre, Joseph M. Addessi, Elsa Hopkins, William D.
Copyright Year	2013
Abstract	Self-control has been studied in nonhuman animals using a variety of tasks. The inter-temporal choice (ITC) task presents choices between smaller–sooner (SS) and larger–later (LL) options. Using food amounts as rewards, this presents two problems: (a) choices of the LL option could either reflect self-control or instead result from animals’ difficulty with pointing to smaller amounts of food; (b) there is no way to verify whether the subjects would not revert their choice for the LL option, if given the opportunity to do so during the ensuing delay. To address these problems, we have recently introduced a new protocol, the hybrid delay task, which combines an initial ITC with a subsequent accumulation phase in which selection of the SS option leads to its immediate delivery, but choice of the LL option then leads to one-by-one presentation of those items that continues only as long as the subject does not eat any of the accumulated items. The choice of the LL option therefore only reflects self-control when the number of items obtained from LL choices during the accumulation phase is higher than what could be received in the SS option. Previous research with capuchin monkeys demonstrated that their apparent self-control responses in the ITC task may have overestimated their general self-control abilities, given their poor performance in the hybrid delay task. Here, chimpanzees instead demonstrated that their choices for the LL option in the ITC phase of the hybrid delay task were confirmed by their ability to sustain long delays during accumulation of LL rewards.
Starting Page	197
Ending Page	205
Page Count	9
File Format	PDF
ISSN	14359448
Journal	Animal Cognition
Volume Number	17
Issue Number	2
e-ISSN	14359456
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-06-18
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Self-control Chimpanzees Pan troglodytes Inter-temporal choice Hybrid delay task Delay of gratification Behavioural Sciences Zoology Human Physiology Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Ecology, Evolution, Behavior and Systematics

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