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Right Hemisphere Positivity Bias in Preconscious Processing: Data From Five Experiments

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Abstract

Using a signal detection paradigm, participants’ sensitivity to emotionally toned stimuli was evaluated in five experiments. A tachistoscope was used to present stimuli to one hemisphere at a time, too rapidly for conscious identification. Pictures, words, and faces were pretested for emotional valence and familiarity. Stimulus selection was based on obtaining the largest possible difference between the positive and negative valence ratings, keeping familiarity equal. Each experiment used a 2×2×2 mixed groups design. The within-subject variables were the hemispheric presentation (right and left) and the emotional tone of the stimuli (positive and negative). Gender of the participant was the between-subjects variable. The results of these studies indicate greater sensitivity in the right than in the left hemisphere, and greater sensitivity to positive than to negative stimuli. Interpretations focus on the automatization of affect and the brain lateralization of emotional processing.

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  1. Muhlenberg College, Germany

    Laura L. Snodgrass & Kathleen E. Harring

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  1. Laura L. Snodgrass
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Snodgrass, L.L., Harring, K.E. Right Hemisphere Positivity Bias in Preconscious Processing: Data From Five Experiments. Curr Psychol 23, 318–335 (2004). https://doi.org/10.1007/s12144-004-1004-3

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