NDLI: Scalar effects in the visual discrimination of numerosity by pigeons

Content Provider	Springer Nature Link
Author	Emmerton, Jacky Renner, Jennifer C.
Copyright Year	2006
Abstract	Pigeons trained in a conditional discrimination procedure to respond to a visual array made a left or right choice, depending on which of two numbers of elements (i.e., anchor numerosities) the array contained. They were then tested with novel arrays at these anchor numerosities, as well as at interpolated and extrapolated numerosities. Various control conditions showed that the birds’ discrimination performance was primarily based on stimulus numerosity, and not on other factors, such as brightness or area. Results from a series of tests, spanning a wide range of numerosities, conformed to scalar principles. Psychometric functions showed superposition, indicating that Weber’s law applies to numerosity discrimination. The subjective midpoint between anchor values was at the geometric mean. Variability about this bisection point increased in proportion to the numerical value of the mean.
Starting Page	176
Ending Page	192
Page Count	17
File Format	PDF
ISSN	15434494
Journal	Learning & Behavior
Volume Number	34
Issue Number	2
e-ISSN	15434508
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Psychology Neurosciences
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Cognitive Neuroscience Behavioral Neuroscience

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Scalar effects in the visual discrimination of numerosity by pigeons