NDLI: Relative numerosity discrimination by chimpanzees (Pan troglodytes): evidence for approximate numerical representations

Content Provider	Springer Nature Link
Author	Tomonaga, Masaki
Copyright Year	2007
Abstract	Two adult chimpanzees were trained on a relative “numerosity” discrimination task. In each trial, two arrays containing different numbers of red dots were presented on a CRT monitor. The subjects were required to choose the array containing the larger number of dots. In Experiment 1, using numerosities between 1 and 8, 28 different pairs were presented repeatedly, and accuracy scores were analyzed to explore which cues the chimpanzee subjects utilized to perform the task. Multiple regression analyses revealed that the subjects’ performance was (1) not simply controlled by the “numerical” difference between arrays, but that it was (2) best described by Fechner’s Law–that is accuracy increased linearly with the logarithmic value of the numerical difference between arrays divided by the number in the larger of the two arrays. This relationship was maintained when using much larger numerosities (Experiment 3). In Experiment 2, the chimpanzees were tested on the effects of total area and density by manipulating dot size and presentation area. The results revealed that these factors clearly affected the subjects’ performance but that they could not alone explain the results, suggesting that the chimpanzees did use relative numerosity difference as a discriminative cue.
Starting Page	43
Ending Page	57
Page Count	15
File Format	PDF
ISSN	14359448
Journal	Animal Cognition
Volume Number	11
Issue Number	1
e-ISSN	14359456
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-04-19
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Human Physiology Zoology Behavioural Sciences
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Ecology, Evolution, Behavior and Systematics

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