Comparing models of the combined-stimulation advantage for speech recognition.

The Journal of the Acoustical Society of America
Christophe Micheyl, Andrew J Oxenham

Abstract

The "combined-stimulation advantage" refers to an improvement in speech recognition when cochlear-implant or vocoded stimulation is supplemented by low-frequency acoustic information. Previous studies have been interpreted as evidence for "super-additive" or "synergistic" effects in the combination of low-frequency and electric or vocoded speech information by human listeners. However, this conclusion was based on predictions of performance obtained using a suboptimal high-threshold model of information combination. The present study shows that a different model, based on Gaussian signal detection theory, can predict surprisingly large combined-stimulation advantages, even when performance with either information source alone is close to chance, without involving any synergistic interaction. A reanalysis of published data using this model reveals that previous results, which have been interpreted as evidence for super-additive effects in perception of combined speech stimuli, are actually consistent with a more parsimonious explanation, according to which the combined-stimulation advantage reflects an optimal combination of two independent sources of information. The present results do not rule out the possible existence of syn...Continue Reading

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Citations

Sep 4, 2013·American Journal of Physical Anthropology·Anna Willis, Marc F Oxenham
May 23, 2015·The Journal of the Acoustical Society of America·Ying-Yee KongAla Somarowthu
Dec 28, 2016·Trends in Hearing·Andrew J Oxenham
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Dec 14, 2016·Journal of Speech, Language, and Hearing Research : JSLHR·Michael F DormanSarah Cook Natale
Jun 3, 2018·The Journal of the Acoustical Society of America·Fei Chen, Jing Chen
May 10, 2019·The Journal of the Acoustical Society of America·Fei Chen, Jing Chen
Jan 1, 2021·The Journal of the Acoustical Society of America·Hongde WuDingchang Zheng

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