Size matters: impact of item size and quantity on array choice by chimpanzees (Pan troglodytes)

Journal of Comparative Psychology
S T BoysenK L Mukobi

Abstract

The authors previously reported that chimpanzees (Pan troglodytes) showed a striking bias to select the larger of 2 candy arrays, despite a reversed reward contingency in which the animals received the smaller, nonselected array as a reward, except when Arabic numerals were used as stimuli. A perceptual or incentive-based interference occurred that was overcome by symbolic stimuli. The authors of the present study examined the impact of element size in choice arrays, using 1 to 5 large and small candies. Five test-sophisticated chimpanzees selected an array from the 2 presented during each trial. Their responses were not optimal, as animals generally selected arrays with larger total mass; thus, they received the smaller remaining array as a reward. When choice stimuli differed in size and quantity, element size was more heavily weighted, although choices reflected total candy mass. These results replicate previous findings showing chimpanzees' difficulties with quantity judgments under reverse reward contingencies and also show that individual item size exerts a more powerful interference effect.

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Citations

May 23, 2007·Animal Cognition·E E FurlongS T Boysen
Aug 21, 2008·Animal Cognition·Naoko Irie-SugimotoToshikazu Hasegawa
Oct 12, 2001·Journal of Comparative Psychology·V A Kuhlmeier, S T Boysen
Oct 16, 2004·Journal of Comparative Psychology·Chikako Suda, Josep Call
May 25, 2006·Journal of Comparative Psychology·Judith Burkart, Adolf Heschl
Aug 23, 2008·The Quarterly Journal of Experimental Psychology : QJEP·James R AndersonKazuo Fujita
Sep 18, 2008·Proceedings. Biological Sciences·A H TaylorR D Gray
Sep 6, 2014·PloS One·Bailey R HouseSteven J Schapiro
Jul 28, 2005·Journal of Experimental Psychology. Animal Behavior Processes·Michael J BeranDavid A Washburn
Dec 13, 2006·Proceedings of the National Academy of Sciences of the United States of America·Felicia HurewitzBrian Schnitzer
Jan 15, 2014·Eating Behaviors·Devina Wadhera, Elizabeth D Capaldi-Phillips
Jan 1, 2012·Scientifica·Theodore A EvansMichael J Beran
Apr 20, 2014·Animal Cognition·Anna Albiach-Serrano, Josep Call
Sep 24, 2010·Journal of Neurophysiology·Maria A Bermudez, Wolfram Schultz
Feb 8, 2016·Animal Cognition·Katja KargMichael Tomasello
Jul 24, 2012·Animal Behaviour·Jennifer Vonk, Michael J Beran
Nov 26, 2015·Behavioural Processes·Maria Elena Miletto Petrazzini, Clive D L Wynne
Jul 28, 2009·Cognition·Carla KrachunMichael Tomasello
May 26, 2010·The European Journal of Neuroscience·Wolfram Schultz
May 13, 2015·Animal Cognition·Katja KargMichael Tomasello
Jan 18, 2007·Journal of Experimental Psychology. Animal Behavior Processes·Rosa RuganiGiorgio Vallortigara
Dec 10, 2013·Cognition·Christoph J Völter, Josep Call
Mar 29, 2014·Journal of Applied Animal Welfare Science : JAAWS·Laura M KurtyczStephen R Ross
Jul 28, 2016·Journal of Experimental Child Psychology·Carla Krachun, Robert W Lurz
Nov 28, 2016·American Journal of Primatology·Katie HallFrans B M de Waal
Jun 1, 2012·Behavioral Sciences·Naoko Irie, Toshikazu Hasegawa
Dec 23, 2017·Learning & Behavior·Devina WadheraElizabeth D Capaldi-Phillips

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