The objective measurement of facial expression in patients with right brain damage and Parkinson's disease.
Item
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Title
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The objective measurement of facial expression in patients with right brain damage and Parkinson's disease.
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Identifier
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AAI8820849
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identifier
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8820849
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Creator
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Brozgold, Alizah Zahavah.
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Contributor
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Adviser: Joan C. Borod
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Date
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1988
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Language
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English
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Publisher
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City University of New York.
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Subject
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Psychology, General
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Abstract
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While the clinical neurological literature suggests two separate neuroanatomical systems for voluntary versus spontaneous facial movement (one cortical, the other subcortical), the brain-behavior relationships subsumed by these systems have not been clearly delineated. In order to clarify these relationships, patients with cortical and subcortical lesions were compared in their ability to produce facial expressions under both posed and spontaneous conditions.;The major contribution of this research was its use of an objective, theoretically-based, anatomically linked coding scheme--the adult-modified, Maximally Discriminative Facial Movement Coding System (Izard, 1983; Malatesta and Izard, 1984). Max identifies muscular configurations in three facial regions (brows, eyes, mouth) that are associated with prototypical expressions.;Posed and spontaneous facial expressions were examined in a small sample of right brain-damaged, Parkinsonian, and normal control subjects. Patients with right hemisphere cerebrovascular pathology are of interest, not only because of their cortical lesions, but because the right hemisphere appears to be dominant for the expression of emotion (for review, see Borod, Koff, and Caron, 1983; Tucker, 1981). Patients with Parkinson's Disease are of interest because of their subcortical damage and their hallmark symptom of masked facies.;Subjects were videotaped while posing emotional expressions (happiness, interest, sadness, and anger) and while recollecting a happy and a sad emotional experience. The expressions were then Max coded by the author and an expert Max rater and later subjectively rated by four naive judges.;The study found mixed support for the hypothesized dissociation between posed and spontaneous expressions for the cortical and subcortical lesion groups. Two out of three Parkinsonians were less expressive in the spontaneous than the posed condition, but only one of the right brain-damaged patients showed the expected dissociation between posed and spontaneous expression.;Clear group differences did emerge as a function of valence and facial region. The right brain-damaged group produced more unpleasant than pleasant expression components across both conditions and was subjectively rated as conveying more negative emotion. They also showed reduced mouth movement compared to the other groups as a result of their lower facial paralysis.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
