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Inherently Analog Quantity Representations in Olive Baboons (Papio anubis)
Allison M Barnard1, Kelly D Hughes, Regina R Gerhardt
1Department of Brain and Cognitive Sciences, University of Rochester Rochester, NY, USA.
Frontiers in Psychology
|May 9, 2013
Summary
Olive baboons demonstrate an analog numerical representation system, not a limited object-file system. Their performance in quantity discrimination tasks suggests a comparative, ratio-dependent system for numerical cognition.
Area of Science:
- Cognitive Science
- Comparative Psychology
- Primate Behavior
Background:
- Non-human primates exhibit numerical representation, but its underlying mechanism remains debated.
- Proposed mechanisms include a discrete object-file system (limited to small quantities) and an analog system (ratio-dependent).
Purpose of the Study:
- To investigate the nature of numerical representation in non-human primates.
- To differentiate between object-file and analog system hypotheses using quantity discrimination tasks.
Main Methods:
- Eight naive olive baboons (Papio anubis) discriminated food item quantities.
- Quantities included small (<4), large (>4), and span (small vs. large) pairs.
- Items were presented simultaneously or sequentially.
Main Results:
- Baboons successfully discriminated all quantity pair types above chance levels.
- Performance significantly correlated with the numerical ratio between quantities.
- Evidence for analog representation was observed in both simultaneous and sequential trials, even upon initial exposure.
Conclusions:
- Data support a coherent analog representation system for spontaneous quantitative abilities in primates.
- The findings challenge the object-file hypothesis for primate numerical cognition.
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