[Lateralization thresholds for two-tone complexes in man with various interaural differences in stimulation]

With the aid of dichotic stimulation, one-tone signals (1 and 2 kHz) and two--tone complexes (mixture of these frequencies) were presented to subjects with interaural differences simulating shift of the sound image for azimuth angle alpha = 45 and 60 degrees in respect to situation of this image at the midline (alpha = 0 degree). At alpha = 0 degree, the lateralization threshold of the two--tone complex for interaural delay of the low-frequency component tone (1 kHz) is lesser by half than the lateralization threshold for the one--tone signal of the same frequency, whereas the lateralization threshold of the two--tone complex for interaural differences of the higher (2 kHz) tone intensity is somewhat greater than the analogous lateralization threshold for the one--tone signal of the same frequency. At alpha = 45 degrees, the differences between respective lateralization thresholds of the two--tone complex and one--tone signals become less obvious, and quite insignificant at alpha = 60 degrees.