Heritability of individual differences in cortical processing of facial affect.

Behavior Genetics
Andrey P AnokhinAndrew C Heath

Abstract

Facial expression of emotion is a key mechanism of non-verbal social communication in humans. Deficits in processing of facial emotion have been implicated in psychiatric disorders characterized by abnormal social behavior, such as autism and schizophrenia. Identification of genetically transmitted variability in the neural substrates of facial processing can elucidate the pathways mediating genetic influences on social behavior and provide useful endophenotypes for psychiatric genetic research. This study examined event-related brain potentials (ERPs) evoked by changes in facial expression in adolescent twins (age 12, 47 monozygotic and 51 dizygotic pairs). Facial images with happy, fearful, and neutral expressions were administered in a continuous mode, such that different expressions of the same face instantaneously replaced each other. This experimental design allowed us to isolate responses elicited by changes in emotional expression that were not confounded with responses elicited by image onset. Changes of emotional expression elicited a N240 wave with a right temporoparietal maximum and a P300 wave with a centropariatal midline maximum. Genetic analyses using a model fitting approach showed that a substantial proportion...Continue Reading

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