Discrimination of Facial Expressions in Tufted Capuchin Monkeys (Sapajus apella) Pubblico
Rubin, Taylor Leigh (2012)
Published
Abstract
Abstract
Discrimination of Facial Expressions in Tufted Capuchin Monkeys (
Sapajus apella)
Facial expressions are important signals that facilitate primate
social interactions.
Tufted capuchins ( Sapajus apella) readily discriminate
conspecific faces and categorize
them according to group membership. In three experiments, we
examined whether this
discrimination extends to facial expressions and how the
discrimination is made. We
tested whether tufted capuchins discriminate between neutral
expressions and either
affiliative eyebrow flash expressions or agonistic open-mouth
threat expressions, whether
the presence of salient facial features was sufficient for tufted
capuchins to make such
discriminations, and whether they demonstrated an inversion effect.
Data were collected
from nine adult and sub-adult monkeys using an oddity paradigm on
touchscreen
computers. Subjects discriminated between emotional and neutral
expressions
significantly above chance. Furthermore, they discriminated between
open-mouth threats
and neutral expressions with varying degrees of visible teeth and
mouth opening
significantly better than chance in all conditions and showed
evidence of an inversion
effect. These results suggest that discriminating emotional facial
expressions is an
important aspect of tufted capuchin communication and that like
humans and
chimpanzees, holistic, rather than feature-based processing is the
dominant mechanism.
By investigating the similarities in face processing between
species, we gain a deeper
understanding of the evolution of facial expressions as parts of
communication systems.
Discrimination of Facial Expressions in Tufted Capuchin Monkeys
( Sapajus apella)
B.A., College of William & Mary, 2008
Advisor: Frans B.M. de Waal, Ph.D.
A thesis submitted to the Faculty of the James T. Laney School of
Graduate Studies of
Emory University in partial fulfillment of the requirements for the
degree of Master of
Arts in Psychology 2012.
Table of Contents
Table of Contents
Introduction
1
Hypotheses & Predictions
8
Experiment 1
8
Experiment 2
9
Experiment 3
10
Method
10
Subjects
10
Apparatus
12
Design & Procedure
13
Stimuli
14
Experiment 1
15
Experiment 2
16
Experiment 3
16
Results
17
Experiment 1
17
Experiment 2
19
Experiment 3
23
Age, Rank, and Sex Analyses
25
Discussion
26
Conclusion
29
References
30
Appendix A
34
About this Master's Thesis
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