on four subjects, perception of the movement velocity of the fused auditory image (FI) was studied by means of click-train dichotic stimulation with gradually changing interaural time delays. With the signal used, the subjects were able to perceive differences in the velocities of FI movement. Absolute velocity difference limens (DL’s) were determined on the assumption that FI movements was uniform and that its trajectory might be approximated by an arc of a circle. The velocity DL’s were found to be nearly linearly related to the velocity of FI movement and increased from 14°/sec to 140°/sec.

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Single unit activity from the VI and VII lobuli of the cerebellar vermis cortex was studied following acoustical stimulation with sound signals of different parameters. Cerebellar neurons, as compared to those from the auditory system, showed low selectivity to sound frequency, intensity and duration. However, about 2/3 of the neurons were selectively sensitive to interaural time and intensity differences; about 1/3 of neurons showed a specific response to signals simulating sound motion in a definite direction. Thus, cerebellar neurons seem to be mainly responsive to those sound parameters which are essential for sound localization.