Stationary-noise results of experiment 1, showing (a) group-mean CV/VC identification performance and (b) mean chance-corrected performance for each set-size condition. Solid curves represent sigmoidal fits to the data. The horizontal dashed line indicates the 50% correct level of performance. Error bars indicate standard errors of mean values across listeners.
SRTs (the SNR required for 50%-correct performance) derived from the group-mean psychometric functions shown in Fig. 1.
Results of experiment 1, showing (a)–(g) group-mean CV/VC identification performance as a function of SNR for the four tested maskers with the seven set-size conditions plotted in separate panels and (h) mean performance across set-size conditions. Error bars indicate standard errors of mean values across listeners.
Separate panels show CV/VC identification performance for different set size conditions (from 2 to 80) plotted against performance for a set size of 160. Each data point represents a particular SNR and masker condition. Solid curves represent fits to the data for each masker type. Vertical and horizontal error bars indicate standard errors of mean values across listeners.
Estimates of the FMB for each set size for the (a) 4-HZ SAM, (b) 32-Hz SAM and (c) interfering-talker masker conditions. FMB estimates were derived by fitting curves to the psychometric-function data (Fig. 3) and determining the difference in SNR (relative to stationary noise) required in a given fluctuating-masker to achieve the performance level associated with a given stationary-noise SNR. Error bars indicate standard deviations of the FMB estimation error.
Results of experiment 2, showing group-mean threshold set sizes as a function of SNR and adaptive rule. Error bars indicate standard errors of mean values across listeners.
Results of experiment 2, showing group-mean VC/CV identification performance when the nominal set size was fixed at the value determined by the adaptive threshold set-size estimation algorithm. Separate panels show results for measurements of (a) proportion-correct performance level and (b)SRT. Error bars indicate standard errors of mean values across listeners. The accuracy of the adaptive set-size estimation method is indicated by the difference between measured performance and (a) the target performance level (50% or 66.7% correct) or (b) the target SNR represented by the thin lines in each panel.
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