Can monkeys make investments based on maximized pay-off?

Animals can maximize benefits but it is not known if they adjust their investment according to expected pay-offs. We investigated whether monkeys can use different investment strategies in an exchange task. We tested eight capuchin monkeys (Cebus apella) and thirteen macaques (Macaca fascicularis, M...

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Autores principales:	Sophie Steelandt, Valérie Dufour, Marie-Hélène Broihanne, Bernard Thierry
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/37f2a756c41145c88ee87ccb59e0a852
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spelling	oai:doaj.org-article:37f2a756c41145c88ee87ccb59e0a8522021-11-18T06:57:26ZCan monkeys make investments based on maximized pay-off?1932-620310.1371/journal.pone.0017801https://doaj.org/article/37f2a756c41145c88ee87ccb59e0a8522011-03-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21423777/?tool=EBIhttps://doaj.org/toc/1932-6203Animals can maximize benefits but it is not known if they adjust their investment according to expected pay-offs. We investigated whether monkeys can use different investment strategies in an exchange task. We tested eight capuchin monkeys (Cebus apella) and thirteen macaques (Macaca fascicularis, Macaca tonkeana) in an experiment where they could adapt their investment to the food amounts proposed by two different experimenters. One, the doubling partner, returned a reward that was twice the amount given by the subject, whereas the other, the fixed partner, always returned a constant amount regardless of the amount given. To maximize pay-offs, subjects should invest a maximal amount with the first partner and a minimal amount with the second. When tested with the fixed partner only, one third of monkeys learned to remove a maximal amount of food for immediate consumption before investing a minimal one. With both partners, most subjects failed to maximize pay-offs by using different decision rules with each partner' quality. A single Tonkean macaque succeeded in investing a maximal amount to one experimenter and a minimal amount to the other. The fact that only one of over 21 subjects learned to maximize benefits in adapting investment according to experimenters' quality indicates that such a task is difficult for monkeys, albeit not impossible.Sophie SteelandtValérie DufourMarie-Hélène BroihanneBernard ThierryPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 3, p e17801 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sophie Steelandt Valérie Dufour Marie-Hélène Broihanne Bernard Thierry Can monkeys make investments based on maximized pay-off?
description	Animals can maximize benefits but it is not known if they adjust their investment according to expected pay-offs. We investigated whether monkeys can use different investment strategies in an exchange task. We tested eight capuchin monkeys (Cebus apella) and thirteen macaques (Macaca fascicularis, Macaca tonkeana) in an experiment where they could adapt their investment to the food amounts proposed by two different experimenters. One, the doubling partner, returned a reward that was twice the amount given by the subject, whereas the other, the fixed partner, always returned a constant amount regardless of the amount given. To maximize pay-offs, subjects should invest a maximal amount with the first partner and a minimal amount with the second. When tested with the fixed partner only, one third of monkeys learned to remove a maximal amount of food for immediate consumption before investing a minimal one. With both partners, most subjects failed to maximize pay-offs by using different decision rules with each partner' quality. A single Tonkean macaque succeeded in investing a maximal amount to one experimenter and a minimal amount to the other. The fact that only one of over 21 subjects learned to maximize benefits in adapting investment according to experimenters' quality indicates that such a task is difficult for monkeys, albeit not impossible.
format	article
author	Sophie Steelandt Valérie Dufour Marie-Hélène Broihanne Bernard Thierry
author_facet	Sophie Steelandt Valérie Dufour Marie-Hélène Broihanne Bernard Thierry
author_sort	Sophie Steelandt
title	Can monkeys make investments based on maximized pay-off?
title_short	Can monkeys make investments based on maximized pay-off?
title_full	Can monkeys make investments based on maximized pay-off?
title_fullStr	Can monkeys make investments based on maximized pay-off?
title_full_unstemmed	Can monkeys make investments based on maximized pay-off?
title_sort	can monkeys make investments based on maximized pay-off?
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/37f2a756c41145c88ee87ccb59e0a852
work_keys_str_mv	AT sophiesteelandt canmonkeysmakeinvestmentsbasedonmaximizedpayoff AT valeriedufour canmonkeysmakeinvestmentsbasedonmaximizedpayoff AT mariehelenebroihanne canmonkeysmakeinvestmentsbasedonmaximizedpayoff AT bernardthierry canmonkeysmakeinvestmentsbasedonmaximizedpayoff
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Can monkeys make investments based on maximized pay-off?

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