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169th Meeting of the Acoustical Society of America Pittsburgh, Pennsylvania 18-22 May 2015 Psychological and Physiological Acoustics: Paper 1aPPb28


Figure 1 shows performance in percent correct for the long word duration (left column), the short words
duration (right column), and for NH listeners (top row) or HI listeners (bottom row). In each panel the four
sets of bars show the different masker conditions and the black/white bars in each set show mean for 0-ms
and 200-ms gap durations. Performance was almost perfect in quiet for both groups, confirming that
intelligibility of the words (both long and short) was good in the absence of maskers. Because it was clearly
at ceiling, this condition was excluded from the statistical analysis. A four-way mixed ANOVA was
conducted on the RAU-transformed scores with factors of word duration (long/short), gap duration (0/200
ms), masker condition (regular/random/concurrent) and group (NH/HI). The results of the statistical
analysis are shown in Table 2. Main effects of word duration, gap duration, and masker condition, but not
group, were significant. The two-way interactions between word duration and gap duration, and between
word duration and masker condition, were significant. None of the three-way interactions, nor the four-way
interaction, were significant.

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