Two experiments, concerned with the effects of auditory vs. visual presentation on dot pulse counting, are described in a view-point of mufti-channel study. 9 series of dot pulses : 4, 5, 6, . . . . 11, 12, were presented auditory (A) or visually (V) at 10 rates: 100, 125, 150, 200, 225, 250, 300, 350, 400, and 450 msec inter-stimulus intervals (ISI) on each dot pulse. The interference materials were the same dot pulse, but they were presented in delay of a half percent of ISI through the other channel. Channels of presentation were: (1) A-only, (2) V-only, (3) A-V redundant, (4) monaural, left (L) - interference, (5) monocular, L-interference, (6) monaural A-right (R), monocular VL-interference, (7) monocular VR, monaural AL-interference. 12 Ss were required to count the number of dot pulses (click sounds or flashes) presented through each channel. In the first, binaural and binocular, A-presentation was superior to V-presentation on the accuracy of response and reaction time. A-V redundant presentation was not always effecting a significant increment of the correct response. In the second experiment, monaural and monocular in the interference situation, A-presentation had also superiority, and the unisensory system was more affected by the interference materials than the bisensory system.