What makes a smiling face look happy? Visual saliency, distinctiveness, and affect
Manuel G Calvo1, Aida Gutiérrez-García2, Mario Del Líbano2
1Department of Cognitive Psychology, Universidad de La Laguna, 38205, Tenerife, Spain. mgcalvo@ull.es.
Psychological Research
|December 1, 2016
Summary
Facial happiness recognition relies on positive valence, with eye saliency and distinctiveness playing key roles. Delayed eye saliency relative to a smile increases perceived happiness, even with non-happy eyes.
Area of Science:
- Psychology
- Cognitive Neuroscience
- Facial Expression Recognition
Background:
- Facial expressions are crucial for social communication.
- Understanding the factors influencing the perception of happiness is vital for social cognition research.
- Previous research has explored various facial cues, but the interplay of visual saliency, distinctiveness, affect, and specific facial actions (Action Units) in happiness recognition requires further elucidation.
Purpose of the Study:
- To investigate the relative contributions of perceptual, conceptual, affective, and morphological factors to the recognition of facial happiness.
- To determine how visual saliency, eye distinctiveness, and specific Action Units influence happiness perception, particularly in blended expressions.
- To examine the temporal dynamics of visual saliency between eyes and mouth in happiness judgments.
Main Methods:
- Utilized face stimuli depicting truly happy and blended expressions (smiling mouth with non-happy eyes).
- Assessed visual saliency of eyes and mouth, eye expression distinctiveness, and rated valence and arousal.
- Analyzed the influence of specific facial Action Units (AUs) on happiness perception.
- Employed logistic regression to model the probability of judging a face as happy based on predictor variables.
Main Results:
- Positive valence of the facial configuration was the primary predictor for perceiving happiness in both truly happy and blended expressions.
- For blended expressions, delayed eye saliency, reduced eye distinctiveness, and specific Action Unit configurations (e.g., AU 6, reduced AUs 4, 5, 9) increased the likelihood of misperceiving happiness.
- A later onset of visual saliency in the eyes relative to the smiling mouth significantly increased the probability of perceiving happiness.
Conclusions:
- Facial happiness perception is strongly influenced by the overall positive valence of the expression.
- The temporal dynamics of visual attention to facial features, specifically the eyes in relation to the mouth, critically impact happiness judgments.
- Specific facial Action Units and the distinctiveness of eye expressions modulate happiness perception, especially when incongruent with a smile.
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