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Quantity representation in children and rhesus monkeys: linear versus logarithmic scales
Michael J Beran1, Julie S Johnson-Pynn, Christopher Ready
1Language Research Center, Georgia State University, Atlanta, GA 30303, USA. mjberan@yahoo.com
Journal of Experimental Child Psychology
|November 21, 2007
Summary
Children and rhesus monkeys showed similar quantity perception, with their point of subjective equality (PSE) closer to the geometric mean. This suggests shared analog magnitude representations in both species, aligning with Weber's law.
Area of Science:
- Cognitive Psychology
- Comparative Cognition
- Neuroscience
Background:
- Understanding quantity representation is crucial for cognitive development and comparative psychology.
- Previous research suggests non-human animals and human children may share fundamental cognitive mechanisms for numerical processing.
Purpose of the Study:
- To compare the quantity assessment abilities of 4- and 5-year-old children and rhesus monkeys.
- To determine if the point of subjective equality (PSE) aligns with the arithmetic or geometric mean in these species.
Main Methods:
- A computerized task was used to assess quantity perception.
- Participants learned two anchor values and classified intermediate values relative to these anchors.
- The location of the PSE was analyzed across four different anchor sets.
Main Results:
- Both children and rhesus monkeys exhibited PSEs closer to the geometric mean for three out of four anchor sets.
- This finding indicates a consistent pattern in how both species represent and compare quantities.
Conclusions:
- The results suggest that both human children and rhesus monkeys utilize similar cognitive strategies for quantity representation.
- These strategies are consistent with analog magnitude systems, potentially logarithmic or linearly scaled with scalar variability, supporting Weber's law.
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