Effect of trial-by-trial variation in center frequency on detection of interaural temporal and intensitive differences in bands of noise.

Sensitivity to interaural temporal disparities (ITDs) and interaural intensitive disparities (IIDs) was measured as a function of duration in conditions where the center frequency (CF) of the stimuli was constant and, separately, in conditions where the CF of the stimuli was varied on a trial-by-trial basis. Stimuli were bands of noise centered at either 300, 1200, 2400, or 4800 Hz with the bandwidth of the noise being 40% of their CF. The largest effects of shortening duration and varying center CF of the stimuli were degradations of sensitivity to ITDs for stimuli centered at 2400 or 4800 Hz. Overall, the data confirm and extend previous findings which indicate that ITDs and IIDs are processed separately within the central nervous system.