Hemispheric asymmetries in categorical facial expression perception

Emotion
D Michael Burt, Markus Hausmann

Abstract

Although many sensory phenomena vary continuously, humans tend to divide them into discrete categories with facial expressions being divided into categories such as happy, sad, anger, and fear. A critical effect of category use is categorical perception: same sized physical differences are better perceived if the difference occurs between two categories rather than within the same category. Here we investigate the lateralization of categorical perception of facial expressions. Categorical perception of facial expressions may be lateralized to the right hemisphere due to the intimacy of basic, possibly universal and innate, prototypical facial expression categories and face processing which is predominantly lateralized to the right hemisphere. Alternatively, facial expression categories may be a linguistic phenomenon and thus predominantly involve the left hemisphere. A visual half-field paradigm was used to assess categorical perception of morphed facial expressions running between happy-sad, and anger-fear. Across two experiments, the lateralization of categorical perception was found to be contingent upon previous exposure. Better between-than within-category discrimination of facial expressions was found in both visual half-...Continue Reading

Citations

Feb 6, 2020·Frontiers in Psychology·Jennifer M B FugateAminda J O'Hare
Nov 14, 2020·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Miloš Stanković
Jul 4, 2021·Brain Structure & Function·Nicola Palomero-Gallagher, Katrin Amunts

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