scholarly journals Categorical perception of facial expressions: Evidence for a “category adjustment” model

2007 ◽  
Vol 35 (7) ◽  
pp. 1814-1829 ◽  
Author(s):  
Debi Roberson ◽  
Ljubica Damjanovic ◽  
Michael Pilling
Keyword(s):  
Facial Expressions ◽  
Categorical Perception ◽  
Adjustment Model ◽  
Category Adjustment Model

Categorical Perception of Happiness and Fear Facial Expressions: An ERP Study

2002 ◽  
Vol 14 (2) ◽  
pp. 210-227 ◽  
Author(s):  
S. Campanella ◽  
P. Quinet ◽  
R. Bruyer ◽  
M. Crommelinck ◽  
J.-M. Guerit
Keyword(s):  
Facial Expressions ◽  
Emotional Expression ◽  
Categorical Perception ◽  
Event Related Potentials ◽  
Matching Task ◽  
Emotional Expressions ◽  
Behavioral Studies ◽  
Temporal Course ◽  
Related Potentials ◽  
Repetition Priming Effect

Behavioral studies have shown that two different morphed faces perceived as reflecting the same emotional expression are harder to discriminate than two faces considered as two different ones. This advantage of between-categorical differences compared with within-categorical ones is classically referred as the categorical perception effect. The temporal course of this effect on fear and happiness facial expressions has been explored through event-related potentials (ERPs). Three kinds of pairs were presented in a delayed same–different matching task: (1) two different morphed faces perceived as the same emotional expression (within-categorical differences), (2) two other ones reflecting two different emotions (between-categorical differences), and (3) two identical morphed faces (same faces for methodological purpose). Following the second face onset in the pair, the amplitude of the bilateral occipito-temporal negativities (N170) and of the vertex positive potential (P150 or VPP) was reduced for within and same pairs relative to between pairs. This suggests a repetition priming effect. We also observed a modulation of the P3b wave, as the amplitude of the responses for the between pairs was higher than for the within and same pairs. These results indicate that the categorical perception of human facial emotional expressions has a perceptual origin in the bilateral occipito-temporal regions, while typical prior studies found emotion-modulated ERP components considerably later.

scholarly journals EMPATH: A Neural Network that Categorizes Facial Expressions

2002 ◽  
Vol 14 (8) ◽  
pp. 1158-1173 ◽  
Author(s):  
Matthew N. Dailey ◽  
Garrison W. Cottrell ◽  
Curtis Padgett ◽  
Ralph Adolphs
Keyword(s):  
Neural Network ◽  
Facial Expression ◽  
Facial Expressions ◽  
Categorical Perception ◽  
Dimensional Space ◽  
Parameter Tuning ◽  
Expression Recognition ◽  
Psychological Phenomena ◽  
Expression Perception ◽  
Facial Expression Perception

There are two competing theories of facial expression recognition. Some researchers have suggested that it is an example of “categorical perception.” In this view, expression categories are considered to be discrete entities with sharp boundaries, and discrimination of nearby pairs of expressive faces is enhanced near those boundaries. Other researchers, however, suggest that facial expression perception is more graded and that facial expressions are best thought of as points in a continuous, low-dimensional space, where, for instance, “surprise” expressions lie between “happiness” and “fear” expressions due to their perceptual similarity. In this article, we show that a simple yet biologically plausible neural network model, trained to classify facial expressions into six basic emotions, predicts data used to support both of these theories. Without any parameter tuning, the model matches a variety of psychological data on categorization, similarity, reaction times, discrimination, and recognition difficulty, both qualitatively and quantitatively. We thus explain many of the seemingly complex psychological phenomena related to facial expression perception as natural consequences of the tasks' implementations in the brain.

Categorical Perception of Morphed Facial Expressions

1996 ◽  
Vol 3 (2) ◽  
pp. 81-118 ◽  
Author(s):  
Andrew J. Calder ◽  
Andrew W. Young ◽  
David I. Perrett ◽  
Nancy L. Etcoff ◽  
Duncan Rowland
Keyword(s):  
Facial Expressions ◽  
Categorical Perception

Categorical perception of emotional facial expressions in alcohol-dependence

2015 ◽  
Vol 156 ◽  
pp. 267-274 ◽  
Author(s):  
Fabien D’Hondt ◽  
Philippe de Timary ◽  
Yaelle Bruneau ◽  
Pierre Maurage
Keyword(s):  
Alcohol Dependence ◽  
Facial Expressions ◽  
Categorical Perception ◽  
Emotional Facial Expressions
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