[Determination of the location of sound sources by dogs exposed to dichotic sounds].

Lateralization thresholds for dichotically presented sounds were measured in dogs by avoidance technique. The animals were trained to lift the left paw when the sound was presented at left, and the right one when it occurred at right. The sound lateralization was achieved by varying interaural time and intensity level differences. Click trains and tonal pulses of 0.3, 1.0 and 5.0 khz frequencies were used as sound stimuli. The threshold for click trains was found to be equal 55--60 mcs for temporal cue and 1.5--1.8 dB for intensity differences. The lateralization threshold turns out to depend on frequency of tonal pulses. Intensity difference thresholds drop with increasing frequency whereas the temporal ones rise. The lateralization for frequencies above 1.5 khz could not be achieved.