Frequency, Attention, and Phonetic Characteristics that Influence the Right-Ear Advantage for Speech Perception

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Title: Frequency, Attention, and Phonetic Characteristics that Influence the Right-Ear Advantage for Speech Perception
Author: McCulloch, Katie
Abstract: The right -ear advantage (REA ) for linguistic stimuli (Kimura , 1961 , 1967 ) is thought to represent an asymmetry of speech perception favoring the left hemisphere . This study seeks to clarify how the REA is altered by : attention instructions , filtering of stimuli , background noise , and phonetic properties of stimuli , viz . , voice onset time (VOT ) and place of articulation (POA ) . Participants heard monosyllabic rhyming words from the Halwes (1990 ) Fused Dichotic Word Test and were instructed to attend to the left or right ear , or to divide attention equally . Stimuli in Experiment 1 were unfiltered , high -pass filtered , or low -pass filtered , and stimuli in Experiment 2 were presented with no noise , white noise , high -pass filtered noise , or low -pass filtered noise . The initial consonants of each dichotic pair were categorized according to POA (bilabial , alveolar , or velar ) and VOT (voiced or unvoiced ) . Repeated -measures ANOVAs performed on laterality ratios showed statistically significant main effects for attention , background noise , VOT , and POA . Right -ear attention , the absence of background noise , and bilateral bilabial presentation enhanced the right -ear advantage . Furthermore , attention interacted with background noise , POA , and VOT .
URI: http : / /hdl .handle .net /10657 /223
Date: 2012-04-19

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Frequency, Attention, and Phonetic Characteristics that Influence the Right-Ear Advantage for Speech Perception. Master's thesis, University of Houston. Available electronically from http : / /hdl .handle .net /10657 /223 .

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