Left-hand panels: Randomly chosen epochs of the four types of targets employed in the main experiment. Right-hand panels: The long-term power spectra of each of the four types of targets.
IID of the pointer (in dB) required to match the intracranial position of the target as a function of the ongoing ITD (left ear leading) imposed on a -wide [panel (a)] or wide [panel (b)] band of Gaussian noise. The data points represent the mean values computed across the four listeners. The error bars represent standard error of the mean. Squares represent data obtained when the target was presented in isolation; triangles represent data obtained when the target was presented along with the low-frequency interferer. Solid lines represent the best linear-regression fits to the data with the intercept forced to be zero. Dashed lines represent quantitative predictions of the extents of laterality in the presence of the interferer. Predictions were derived from an extension of the Heller and Trahiotis (1996) model described in Sec. III C of the text.
Similar to Fig. 2, but for the “” transposed stimuli.
The same as Fig. 3, but for the “” transposed stimuli.
The average standard deviation (in dB) obtained for each ITD in the “no-interference” and “interference” conditions. Each entry in the table represents the mean of the 32 (eight listeners) measures of standard deviation computed across the six matches made by each listener for each experimental condition.
The second through fifth columns report the slopes and variance accounted for by the best-fitting lines to the data obtained in each experimental condition. The sixth column contains the ratios of the “without-interferer” to “with interferer” slopes. The two rightmost columns of the table show the results of the statistical analysis (Edwards, 1964) yielding the significance of the differences of the regression slopes obtained when the targets were presented in isolation versus when they were presented along with the interferer. Asterisks indicate significance using an alpha level of .
Article metrics loading...
Full text loading...