Graduate Thesis Or Dissertation
 

Assessing Lateralization Models in Emotion Perception: The Impact of Emotion, Perceptual Process, and Experimental Paradigm on Visual Field Bias

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s4655q29j

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  • There are currently three main models used to describe the pattern of hemispheric specialization (i.e., lateralization) for emotion perception: the right hemisphere hypothesis, the valence model, and the motivational model. Although evidence exists in support of all three, the variation between each pattern of results may be due to differences between the behavioral measures commonly used in these studies (the emotional chimeric face task and the divided visual field task) rather than any underlying neural organization. The present investigation assessed the three major models of lateralization for emotional perception by creating four experimental tasks of visual field bias. These tasks were specifically designed to cross two unique aspects of the commonly used measures: the experimental paradigms employed (chimeric and divided visual field tasks) and the perceptual processes involved (emotional sensitivity and recognition). Within a sample of right-handed participants (N = 60), no model of lateralization received support across all tasks. However, results indicated the factors of paradigm type and perceptual process had major effects on the visual field advantage displayed. A left visual field advantage was discovered in the chimeric sensitivity task and, to a lesser extent, the chimeric recognition task. A right visual field advantage was found for some emotions in the divided sensitivity task but no visual field differences were found in the divided recognition task. A novel explanation for these results is proposed, suggesting a general hemiface preference that is independent of visual fields.
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