Mirror Image Equivalence in the Perception of Stimuli by Brown Capuchin Monkeys (Cebus apella) Public

Abstract

Abstract
Mirror Image Equivalence in the Perception of Stimuli by Brown Capuchin Monkeys
( Cebus apella)
By Charine Tabbah
Mirror image equivalence, or the inability to discriminate between mirror images, has
been expressed in some nonhuman primates. It is hypothesized that humans are more
adept at discriminating mirror images due to lateralization and hemisphere specialization
in the brain. As demonstrated by children confusing letters of the English alphabet with
their mirror image, mirror image discrimination may not be an innate ability, rather a
learned ability, in humans. In the current study, we tested brown capuchin monkeys
( Cebus apella) on both left right and up down mirror images in an oddity paradigm under
a probe and a learning condition. We found no evidence that they can spontaneously
discriminate both left-right and up-down mirror images, but they may have the capacity
to learn to discriminate both. Future studies should look at learning over a longer period
of time, and introduce more complex stimuli.

Table of Contents

Table of Contents

Introduction .........................................................................................................................1
Figure 1 ..............................................................................................................................11
Methods..............................................................................................................................15
Figure 2 ..............................................................................................................................17
Figure 3 ..............................................................................................................................18
Results ................................................................................................................................22
Table 1 ...............................................................................................................................24
Discussion ..........................................................................................................................26
Figure 4 ..............................................................................................................................28

About this Honors Thesis

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School	Emory College
Department	Psychology
Degree	BA
Submission	Honors Thesis
Language	English
Research Field	Psychology, General
Mot-clé	cebus apella mirror image equivalence mirror image discrimination
Committee Chair / Thesis Advisor	De Waal, Frans B M, Emory University
Committee Members	Gouzoules, Harold, Emory University Marino, Lori, Emory University

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