Abstract
Self-control tasks used with nonhuman animals typically involve the choice between an immediate option and a delayed, but more preferred option. However, in many self-control scenarios, not only does the more impulsive option come sooner in time, it is often more concrete than the delayed option. For example, studies have presented children with the option of eating a visible marshmallow immediately, or foregoing it for a better reward that can only be seen later. Thus, the immediately available option is visible and concrete, whereas the delayed option is not visible and more abstract. We tested eight capuchin monkeys to better understand this potential effect by manipulating the visibility of the response options and the visibility of the baiting itself. Monkeys observed two food items (20 or 5 g pieces of banana) each being placed either on top of or inside of one of the two opaque containers attached to a revolving tray apparatus, either in full view of monkeys or occluded by a barrier. Trials ended when monkeys removed a reward from the rotating tray. To demonstrate self-control, monkeys should have allowed the smaller piece of food to pass if the larger piece was forthcoming. Overall, monkeys were successful on the task, allowing a smaller, visible piece of banana to pass from reach in order to access the larger, nonvisible banana piece. This was true even when the entire baiting process took place out of sight of the monkeys. This finding suggests that capuchin monkeys succeed on self-control tasks even when the delayed option is also more abstract than the immediate one—a situation likely faced by primates in everyday life.
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References
Addessi E, Paglieri F, Beran M, Evans T, Macchitella L, De Petrillo F, Focaroli V (2013) Delay choice vs. delay maintenance: different measures of delayed gratification in capuchin monkeys (Cebus apella). J Comp Psychol 127:392–398
Ainslie G (1974) Impulse control in pigeons. J Exp Anal Behav 21:485–489. doi:10.1901/jeab.1974.21-485
Anderson JR, Kuroshima H, Fujita K (2010) Delay of gratification in capuchin monkeys (Cebus apella) and squirrel monkeys (Saimiri sciureus). J Comp Psychol 124:205–210. doi:10.1037/a0018240
Beran MJ (2002) Maintenance of self-imposed delay of gratification by four chimpanzees (Pan troglodytes) and an orangutan (Pongo pygmaeus). J Gener Psychol 129:49–66. doi:10.1080/00221300209602032
Beran MJ, Evans TA (2006) Maintenance of delay of gratification by four chimpanzees (Pan troglodytes): the effects of delayed reward visibility, experimenter presence, and extended delay intervals. Behav Process 73:315–324. doi:10.1016/Jbeproc.2006.07.005
Berns GS, Laibson D, Loewenstein G (2007) Intertemporal choice—toward an integrative framework. Trends Cognit Sci 11:482–488. doi:10.1016/Jtics.2007.08.011
Bramlett JL, Perdue BM, Evans TA, Beran MJ (2012) Capuchin monkeys (Cebus apella) let lesser rewards pass them by to get better rewards. Anim Cognit 15:963–969
Dufour V, Pele M, Sterck EHM, Thierry B (2007) Chimpanzee (Pan troglodytes) anticipation of food return: coping with waiting time in an exchange task. J Comp Psychol 121:145–155
Dufour V, Wascher CAF, Braun A, Miller R, Bugnyar T (2012) Corvids can decide if a future exchange is worth waiting for. Biol Lett 8:201–204
Evans TA, Westergaard GC (2006) Self-control and tool-use in tufted capuchin monkeys (Cebus apella). J Comp Psychol 120:163–166. doi:10.1037/0735-7036.120.2.163
Evans TA, Beran MJ (2007) Chimpanzees use self-distraction to cope with impulsivity. Biol Lett 3:599–602. doi:10.1098/rsbl.2007.0399
Evans TA, Beran MJ (2014) Monkeys wait to begin a computer task when waiting makes their responses more effective. Anim Behav Cognit 1:36–50
Evans TA, Beran MJ, Paglieri F, Addessi E (2012) Delaying gratification for food and tokens in capuchin monkeys (Cebus apella) and chimpanzees (Pan troglodytes): when quantity is salient, symbolic stimuli do not improve performance. Anim Cognit 15:539–548. doi:10.1007/s10071-012-0482-1
Evans TA, Perdue BM, Parrish AE, Beran MJ (2014) Working and waiting for better rewards: self-control in two monkey species (Cebus apella and Macaca mulatta). Behav Process 103:236–242
Logue AW (1988) Research on self-control: an integrating framework. Behav Brain Sci 11:665–709. doi:10.1017/S0140525X00053978
Mischel W, Ebbesen EB (1970) Attention in delay of gratification. J Personal Soc Psychol 16:329–337
Paglieri F, Focaroli V, Bramlett J, Tierno V, McIntyre J, Addessi E, Evans TA, Beran MJ (2013) The hybrid delay task: Can capuchin monkeys (Cebus apella) sustain a delay after an initial choice to do so? Behav Process 94:45–54
Parrish AE, Perdue BM, Stromberg EE, Bania AE, Evans TA, Beran MJ (2014) Delay of gratification by orangutans (Pongo pygmaeus) in the accumulation task. J Comp Psychol 128:209–214
Pelé M, Dufour V, Micheletta J, Thierry B (2010) Long-tailed macaques display unexpected waiting abilities in exchange tasks. Anim Cognit 13:263–271. doi:10.1007/s10071-009-0264-6
Pelé M, Micheletta J, Uhlrich P, Thierry B, Dufour V (2011) Delay maintenance in Tonkean Macaques (Macaca tonkeana) and Brown Capuchin Monkeys (Cebus apella). Int J Primatol 32:149–166. doi:10.1007/s10764-010-9446-y
Stevens JR, Hallinan EV, Hauser MD (2005a) The ecology and evolution of patience in two New World monkeys. Biol Lett 1:223–226. doi:10.1098/rsbl.2004.0285
Stevens JR, Rosati AG, Ross KR, Hauser MD (2005b) Will travel for food: spatial discounting in two New World monkeys. Current Biol 15:1855–1860
Tobin H, Chelonis JJ, Logue AW (1993) Choice in self-control paradigms using rats. Psychol Rec 43(3):441–453
Vick S-J, Bovet D, Anderson J (2010) How do African grey parrots (Psittacus erithacus) perform on a delay of gratification task? Anim Cognit 13:351–358. doi:10.1007/s10071-009-0284-2
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Perdue, B.M., Bramlett, J.L., Evans, T.A. et al. Waiting for what comes later: capuchin monkeys show self-control even for nonvisible delayed rewards. Anim Cogn 18, 1105–1112 (2015). https://doi.org/10.1007/s10071-015-0878-9
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DOI: https://doi.org/10.1007/s10071-015-0878-9