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Self-control in rhesus macaques (Macaca mulatta): controlling for differential stimulus exposure
Allen D Szalda-Petree1, Baine B Craft, Lori M Martin
1Department of Psychology, Skaggs Building, Room 143, The University of Montana-Missoula, Missoula, MT 59812-MPSI01, USA. allen.szalda-petree@umontana.edu
Perceptual and Motor Skills
|April 3, 2004
Summary
Rhesus macaques demonstrate a strong self-control bias, consistently choosing delayed larger rewards over immediate smaller ones. This study controlled for stimulus exposure, confirming robust self-control in primates.
Area of Science:
- Behavioral neuroscience
- Primate cognition
- Animal behavior
Background:
- Previous research indicated macaques (Macaca fascicularis) favor delayed, larger rewards (self-control) over immediate, smaller ones (impulsive choice).
- Traditional self-control studies used discriminative stimuli during delays, potentially inflating self-control preference due to increased stimulus exposure.
Purpose of the Study:
- To investigate self-control bias in rhesus macaques (Macaca mulatta).
- To control for differential stimulus exposure durations during delay periods in self-control tasks.
Main Methods:
- Three rhesus macaques were presented with choices between immediate-smaller and delayed-larger reinforcers via computer monitor.
- Choices were made by touching stimuli; both stimuli were removed during delay periods to equalize stimulus exposure.
Main Results:
- All three subjects exhibited a strong bias favoring the delayed, larger reinforcer (self-control).
- This preference persisted despite methodological variations aimed at controlling stimulus exposure.
Conclusions:
- Rhesus macaques display a significant and consistent self-control bias.
- The findings align with prior research on primate self-control, reinforcing its robustness across different methodologies and species.