Stimulus order effects in vowel discrimination
作者:
Bruno H. Repp,
Robert G. Crowder,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1990)
卷期:
Volume 88,
issue 5
页码: 2080-2090
ISSN:0001-4966
年代: 1990
DOI:10.1121/1.400105
出版商: Acoustical Society of America
数据来源: AIP
摘要:
In same–different discrimination tasks employing isolated vowel sounds, subjects often give significantly more ‘‘different’’ responses to one order of two stimuli than to the other order. Cowan and Morse [J. Acoust. Soc. Am.79, 500–507 (1986)] proposed aneutralizationhypothesisto account for such effects: The first vowel in a pair is assumed to change its quality in memory in the direction of the neutral vowel, schwa. Three experiments were conducted using a variety of vowels and some initial support for the hypothesis was obtained, using a large stimulus set, but conflicting evidence with smaller stimulus sets. Rather than becoming more similar to schwa, the first vowel in a pair seems to drift toward the interior of the stimulus range employed in a given test. Several possible explanations are discussed for this tendency and its relation to presentation order effects obtained in other psychophysical paradigms is noted.
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