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Bargaining in chimpanzees (Pan troglodytes): the effect of cost, amount of gift, reciprocity and communication

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Bargaining in chimpanzees (Pan troglodytes) : the effect of cost, amount of gift, reciprocity and communication. / Bueno-Guerra, Nereida; Voelter, Christoph J.; de las Heras, África; Colell, Montserrat; Call, Josep.

In: Journal of Comparative Psychology, Vol. Online First, 27.06.2019.

Research output: Contribution to journalArticlepeer-review

Harvard

Bueno-Guerra, N, Voelter, CJ, de las Heras, Á, Colell, M & Call, J 2019, 'Bargaining in chimpanzees (Pan troglodytes): the effect of cost, amount of gift, reciprocity and communication', Journal of Comparative Psychology, vol. Online First. https://doi.org/10.1037/com0000189

APA

Bueno-Guerra, N., Voelter, C. J., de las Heras, Á., Colell, M., & Call, J. (2019). Bargaining in chimpanzees (Pan troglodytes): the effect of cost, amount of gift, reciprocity and communication. Journal of Comparative Psychology, Online First. https://doi.org/10.1037/com0000189

Vancouver

Bueno-Guerra N, Voelter CJ, de las Heras Á, Colell M, Call J. Bargaining in chimpanzees (Pan troglodytes): the effect of cost, amount of gift, reciprocity and communication. Journal of Comparative Psychology. 2019 Jun 27;Online First. https://doi.org/10.1037/com0000189

Author

Bueno-Guerra, Nereida ; Voelter, Christoph J. ; de las Heras, África ; Colell, Montserrat ; Call, Josep. / Bargaining in chimpanzees (Pan troglodytes) : the effect of cost, amount of gift, reciprocity and communication. In: Journal of Comparative Psychology. 2019 ; Vol. Online First.

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@article{12a0087b4a504b0682a785345b382b31,
title = "Bargaining in chimpanzees (Pan troglodytes): the effect of cost, amount of gift, reciprocity and communication",
abstract = "Humans routinely incur costs when allocating resources and reject distributions judged to be below/over an expected threshold. The Dictator/Ultimatum Games (DG/UG) are two-player games that quantify prosociality and inequity aversion by measuring allocated distributions and rejection thresholds. Although the UG has been administered to chimpanzees and bonobos, no study has used both games to pinpoint their motivational substrate. We administered a DG/UG using pre-assigned distributions to four chimpanzee dyads controlling for factors that could explain why proposers{\textquoteright} behavior varied substantially across previous studies: game order, cost for proposers and amount for recipients. Moreover, players exchanged their roles (proposer/recipient) to test reciprocity. Our results show that proposers offered more in the DG than in the non-social baseline, particularly when they incurred no cost. In UG, recipients accepted all above-zero offers, suggesting absence of inequity aversion. Proposers preferentially chose options that gave larger amounts to the partner. However, they also decreased their offers across sessions, probably being inclined to punish their partner{\textquoteright}s rejections. Therefore, chimpanzees were not strategically motivated towards offering more generously to achieve ulterior acceptance from their partner. We found no evidence of reciprocity. We conclude that chimpanzees are generous rational maximizers that may not engage in strategic behavior. ",
keywords = "Ultimatum game, Dictator game, Fairness, Inequity aversion, Reciprocity, Chimpanzees",
author = "Nereida Bueno-Guerra and Voelter, {Christoph J.} and {de las Heras}, {\'A}frica and Montserrat Colell and Josep Call",
note = "Authors thank the two funding institutions which supported the present study: FPU12/00409 grant provided by the Spanish Ministry of Education and held by NBG and La Caixa grant held by AD. ",
year = "2019",
month = jun,
day = "27",
doi = "10.1037/com0000189",
language = "English",
volume = "Online First",
journal = "Journal of Comparative Psychology",
issn = "0735-7036",
publisher = "AMER PSYCHOLOGICAL ASSOC",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Bargaining in chimpanzees (Pan troglodytes)

T2 - the effect of cost, amount of gift, reciprocity and communication

AU - Bueno-Guerra, Nereida

AU - Voelter, Christoph J.

AU - de las Heras, África

AU - Colell, Montserrat

AU - Call, Josep

N1 - Authors thank the two funding institutions which supported the present study: FPU12/00409 grant provided by the Spanish Ministry of Education and held by NBG and La Caixa grant held by AD.

PY - 2019/6/27

Y1 - 2019/6/27

N2 - Humans routinely incur costs when allocating resources and reject distributions judged to be below/over an expected threshold. The Dictator/Ultimatum Games (DG/UG) are two-player games that quantify prosociality and inequity aversion by measuring allocated distributions and rejection thresholds. Although the UG has been administered to chimpanzees and bonobos, no study has used both games to pinpoint their motivational substrate. We administered a DG/UG using pre-assigned distributions to four chimpanzee dyads controlling for factors that could explain why proposers’ behavior varied substantially across previous studies: game order, cost for proposers and amount for recipients. Moreover, players exchanged their roles (proposer/recipient) to test reciprocity. Our results show that proposers offered more in the DG than in the non-social baseline, particularly when they incurred no cost. In UG, recipients accepted all above-zero offers, suggesting absence of inequity aversion. Proposers preferentially chose options that gave larger amounts to the partner. However, they also decreased their offers across sessions, probably being inclined to punish their partner’s rejections. Therefore, chimpanzees were not strategically motivated towards offering more generously to achieve ulterior acceptance from their partner. We found no evidence of reciprocity. We conclude that chimpanzees are generous rational maximizers that may not engage in strategic behavior.

AB - Humans routinely incur costs when allocating resources and reject distributions judged to be below/over an expected threshold. The Dictator/Ultimatum Games (DG/UG) are two-player games that quantify prosociality and inequity aversion by measuring allocated distributions and rejection thresholds. Although the UG has been administered to chimpanzees and bonobos, no study has used both games to pinpoint their motivational substrate. We administered a DG/UG using pre-assigned distributions to four chimpanzee dyads controlling for factors that could explain why proposers’ behavior varied substantially across previous studies: game order, cost for proposers and amount for recipients. Moreover, players exchanged their roles (proposer/recipient) to test reciprocity. Our results show that proposers offered more in the DG than in the non-social baseline, particularly when they incurred no cost. In UG, recipients accepted all above-zero offers, suggesting absence of inequity aversion. Proposers preferentially chose options that gave larger amounts to the partner. However, they also decreased their offers across sessions, probably being inclined to punish their partner’s rejections. Therefore, chimpanzees were not strategically motivated towards offering more generously to achieve ulterior acceptance from their partner. We found no evidence of reciprocity. We conclude that chimpanzees are generous rational maximizers that may not engage in strategic behavior.

KW - Ultimatum game

KW - Dictator game

KW - Fairness

KW - Inequity aversion

KW - Reciprocity

KW - Chimpanzees

U2 - 10.1037/com0000189

DO - 10.1037/com0000189

M3 - Article

VL - Online First

JO - Journal of Comparative Psychology

JF - Journal of Comparative Psychology

SN - 0735-7036

ER -

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