![]() ![]() ![]() A related version of this hypothesis (the motoric direction hypothesis), based on conceptual notions of Schnierla, 11 suggests that approach emotions are mediated by the left hemisphere and withdrawal/avoidance emotions by the right hemisphere. 10 The latter hypothesis suggests that negative and positive emotions are differentially processed by the right and left hemispheres, respectively. 7, 8 The notion of right hemisphere mediation of expression, referred to as the right-hemisphere hypothesis, 9 can be contrasted with another theory on the generation of expression, known as the valence hypothesis. Specifically, emotionally laden or affective expressions are more intensely displayed on the left than the right side of the face. 1– 3 Consistent with findings that facial musculature is contralaterally innervated, 4– 6 studies of posed expression in normal right-handed adults have found asymmetries of expression. The literature suggests that emotional expression is mediated by the right hemisphere. An unanticipated right-hemispace perceptual bias among the judges may reflect the analytical, detailed rating procedure used and the presumably greater reliance by the judges on left- than right-hemisphere strategies. UDs showed more pronounced facial asymmetry than SZs or NCs. In general, approach expressions were produced with greater right-hemiface intensity, and withdrawal expressions with greater left-hemiface intensity. Across subject groups, expressions were more intense in the visual than the verbal condition. Overall, SZs produced expressions with diminished intensity relative to UDs and NCs. Naive judges rated hemiface stimuli for intensity in original and mirror-reversed orientations. Subjects were videotaped while posing positive, neutral, and negative facial expressions to verbal command and to visual imitation. Hypotheses regarding right-hemisphere activation in UD and suppression in SZ were addressed, as well as hypotheses about emotion and laterality. This study examined facial emotional expressions produced by schizophrenic (SZ), unipolar depressed (UD), and normal control (NC) right-handed adults. ![]()
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