Examinations of identity invariance in facial expression adaptation |
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Authors: | Melissa Ellamil Joshua M Susskind Adam K Anderson |
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Institution: | (1) Department of Psychology, Queen’s University, Kingston, ON, K7L 3N6, Canada;(2) Department of Psychology, Carnegie Mellon University, Pittsburgh, PA 15213-3890, USA;(3) Division of Cerebral Integration, National Institute for Physiological Sciences (NIPS), Myodaiji, 444-8585 Okazaki, Japan |
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Abstract: | Faces provide a wealth of information essential to social interaction, including both static features, such as identity, and
dynamic features, such as emotional state. Classic models of face perception propose separate neural-processing routes for
identity and facial expression (Bruce & Young, 1986), but more recent models suggest that these routes are not independent
of each other (Calder & Young, 2005). Using a perceptual adaptation paradigm in the present study, we attempted to further
examine the nature of the relation between the neural representations of identity and emotional expression. In Experiment
1, adaptation to the basic emotions of anger, surprise, disgust, and fear resulted in significantly biased perception away
from the adapting expression. A significantly decreased aftereffect was observed when the adapting and the test faces differed
in identity. With a statistical model that separated surface texture and reflectance from underlying expression geometry,
Experiment 2 showed a similar decrease in adaptation when the face stimuli had identical underlying prototypical geometry
but differed in the static surface features supporting identity. These results provide evidence that expression adaptation
depends on perceptual features important for identity processing and thus suggest at least partly overlapping neural processing
of identity and facial expression. |
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