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Author Taubert, Jessica ♦ Parr, Lisa A.
Source PubMed Central
Content type Text
File Format PDF
Date Created 2009-10-09
Language English
Difficulty Level Medium
Subject Domain (in DDC) Philosophy & psychology ♦ Psychology ♦ Mental processes & intelligence ♦ Technology ♦ Medicine & health
Subject Keyword Experimental and Cognitive Psychology ♦ Cognitive Neuroscience ♦ Neuropsychology and Physiological Psychology
Abstract Humans are subject to the composite illusion: two identical top halves of a face are perceived as “different” when they are presented with different bottom halves. This observation suggests that when building a mental representation of a face, the underlying system perceives the whole face, and has difficulty decomposing facial features. We adapted a behavioural task that measures the composite illusion to examine the perception of faces in two nonhuman species. Specifically we had spider (Ateles geoffroyi) and rhesus monkeys (Macaca mulatta) perform a two-forced choice, match-to-sample task where only the top half of sample was relevant to the task. The results of Experiment 1 show that spider monkeys (N = 2) process the faces of familiar species (conspecifics and humans, but not chimpanzees, sheep, or sticks), holistically. The second experiment tested rhesus monkeys (N = 7) with the faces of humans, chimpanzees, gorillas, sheep and sticks. Contrary to prediction, there was no evidence of a composite effect in the human (or familiar primate) condition. Instead, we present evidence of a composite illusion in the chimpanzee condition (an unfamiliar primate). Together, these experiments show that visual expertise does not predict the composite effect across the primate order.
ISSN 02782626
Age Range above 22 year
Educational Use Research
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2009-12-01
e-ISSN 10902147
Journal Brain and cognition
Volume Number 71
Issue Number 3
Page Count 9
Starting Page 187
Ending Page 195


Source: PubMed Central