Individual and mean first- and second-order modulation detection thresholds. Each panel shows the modulation depth at threshold, in decibels, on the ordinate: for first-order detection and for second-order detection. The abscissa represents the modulation rate: for first-order detection and for second-order detection. Data for first-order modulation detection are represented by triangles, and are drawn with lines connecting the symbols. Data for second-order modulation detection are represented by circles for the slow-rate pair and by squares for the fast-rate pair. Open and filled symbols represent data from conditions without and with notched noise, respectively. First-order modulation depth was fixed at 0.5 for all second-order modulation detection conditions. The symbols (triangles, circles, and squares) represent the mean and error bars represent standard deviation from the mean (note: data from the conditions without notched noise are offset slightly along the abscissa for readability).
Individual and mean scores for detection of second-order modulation with and without a notched-noise masker. The top and bottom panels represent data for the slow- and fast-rate pairs, respectively. Left and right panels show data from the conditions without and with notched noise, respectively. Within each panel, the data for each subject are shown as the mean standard deviation for the conditions with no-masker (unfilled bars), the low-band masker (dark gray filled bars), and the high-band masker (light gray filled bars), from left to right. First-order modulation depth was 0.5 for all subjects and conditions. Other parameters are specified in Table I .
Values of second-order modulation depth and of modulation masker coefficient used in Experiment 2, for both the low-band and high-band modulation masker conditions. The first-order modulation depth was 0.5 for all conditions and all subjects.
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