BINAURAL LATERALIZATION AND SUBJECTIVE LATERAL POSITION SPACE.
Item
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Title
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BINAURAL LATERALIZATION AND SUBJECTIVE LATERAL POSITION SPACE.
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Identifier
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AAI8212219
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identifier
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8212219
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Creator
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TZUO, HUAN-YUAN.
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Contributor
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Eli Osman
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Date
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1982
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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, Experimental
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Abstract
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This dissertation determinated subjective lateral position judgements (accurate to (+OR-) 0.12 degrees) of images for low-frequency binaural tones with various interaural phase (time) shifts.;A paradigm with a standard interval followed by a signal interval was used. The binaural signal was a 250-Hz tone of 50-msec total duration with 10-msec rise/fall times, set to 70 dB SPL. The monaural standard was presented 0.5 seconds before but was otherwise identical to the binaural signal. Three standard conditions were employed: silent interval (no standard), left ear standard, right ear standard. Sixteen interaural phase differences ((theta)s) were selected, covering a wide range ((+OR-) 105(DEGREES)). For each (theta), four local values ((theta)(,i)s) spaced 2(DEGREES) apart and centered at (theta) were randomly presented trial by trial. Ultimately, for each (theta), four distributions of subjective position judgements for the four (theta)(,i) values, P((theta)(,i)), were determined, and were collapsed into one P((theta)) distribution. Statistical properties for each P((theta)) distribution were computed, including the mean(' )P, the standard deviation (sigma)(,P), skewness, and a test for normality. The process was repeated for each value of (theta).;Without standard, mean P (DBLTURN) (theta)/2 for (VBAR)(theta)(VBAR) (LESSTHEQ) 105(DEGREES). With the(' ).;monaural standard, P((theta)) is shifted away from the ear that received(' ).;the standard. Statistics of P depend on P, not (theta). (sigma)(,P) increases as P(' ).;moves laterally from midline and ranges from (midline values) near 3(DEGREES) to about 15(DEGREES) (around 45(DEGREES) off midline). Near midline P distributions appear skewed laterally. Near either ear they appear skewed towards the midline.;Without standard, the global P((theta)) slope is less than any local(' ).;slope for P((theta)(,i)). The P((theta)) and (sigma)(,P)((theta)) results for no standard yield an(' ).;excellent quantitative fit to results on interaural phase difference discrimination. The standard effect cannot be explained by either adaptation or an 'effective' interaural amplitude shift. It weakens the theoretical relationship, implied by previous models, between the structure of the peripheral binaural system and the scale of subjective position.;This study provides quantitative results that appear to be a reliable and valid representation of the statistical properties of lateralization space, and should be important for further understanding of binaural hearing.
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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.
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Program
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Psychology
