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Title Frequency, Attention, and Phonetic Characteristics that Influence the Right-Ear Advantage for Speech Perception
Publication Date
Date Accessioned
Degree MA
Discipline/Department Clinical
Degree Level masters
University/Publisher University of Houston
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.
Subjects/Keywords Speech laterality; speech perception; dichotic listening
Contributors Hiscock, Merrill (advisor); Foss, Donald J. (committee member); Jansen, Ben H. (committee member)
Language en
Country of Publication us
Record ID handle:10657/223
Repository tdl
Date Indexed 2020-04-11
Grantor University of Houston
Issued Date 2012-04-19 00:00:00

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…SD=16.9) and ranged from +29.4 to +100. Procedure Participants were tested at the University of Houston in a sound-attenuated room with an ambient sound level of 34 dB (A-scale). Participants then completed the dichotic listening task…

…psychology honors thesis conducted by Natasha Lachner, under the supervision of Dr. Merrill Hiscock. Fifty-one right-handed University of Houston undergraduate students (13 males and 38 females) volunteered to participate and are included in the…