Effects of stimulus manipulations on visual categorization in pigeons

Behavioural Processes
Olga F LazarevaEdward A Wasserman

Abstract

Four pigeons were previously trained [Lazareva, O.F., Freiburger, K.L., Wasserman, E.A., 2004. Pigeons concurrently categorize photographs at both basic and superordinate levels. Psychon. Bull. Rev. 11, 1111-1117] to classify color photographs into either their proper basic-level category (cars, chairs, flowers, or people) or a superordinate-level category (nominally natural or artificial). In Experiment 1, the same pigeons were shown either reflected or inverted versions of the training stimuli. Reflection had no effect on pigeons' classification behavior, whereas inversion impaired discrimination of all stimulus categories, except flowers, on the basic-level and superordinate-level tasks. Pixel matching analysis revealed that pattern matching played at most a minor role in the birds' categorization behavior. In Experiment 2, the pigeons were shown test stimuli that were either blurred or quartered and scrambled. Blurring impaired discrimination of cars, but had no effect on discrimination of people and flowers; scrambling impaired discrimination of people and flowers leaving discrimination of cars and chairs unaffected. These results suggest that categorization of flowers and people may be controlled primarily by the overall ...Continue Reading

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May 7, 2005·Psychonomic Bulletin & Review·Olga F LazarevaEdward A Wasserman
Aug 9, 2005·Psychonomic Bulletin & Review·Robert G CookAaron P Blaisdell

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Citations

Mar 1, 2008·Animal Cognition·Ulrike AustLudwig Huber
May 5, 2010·Psychological Review·Fabian A Soto, Edward A Wasserman
Nov 30, 2015·Journal of the Experimental Analysis of Behavior·Charlotte KoenenOnur Güntürkün
Nov 24, 2012·Behavioural Processes·Robert G CookEric E Drachman
Feb 18, 2010·Learning and Motivation·Olga F Lazareva, Edward A Wasserman
Oct 2, 2015·Behavioural Processes·Edward A Wasserman
Jan 22, 2015·Animal Cognition·Audrey PerretIsabelle George
Oct 30, 2014·Frontiers in Neural Circuits·Fabian A Soto, Edward A Wasserman
Nov 21, 2007·Animal Cognition·Friederike RangeLudwig Huber

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