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Simultaneous application of the rotatory stimulus with a constant angular acceleration (1∘/sec) did not clearly improve the optokinetic pursuing ability in squirrel monkeys, even though the directions of vestibular and visual stimuli matched. When the directions of vestibular stimulus and visual stimulus conflicted, the optokinetic pursuing ability markedly declined regardless of the stimulus magnitude. The inter-individual difference was large in that situation. For the vestibular-visual coordination, the active head movement condition is considered to be natural and important as a biological function. [ABSTRACT FROM AUTHOR]

The present experiment employed 20 college students who demonstrated an ability to make determinations of interruption or continuity in a random noise signal that alternated with a tonal burst. The primary purpose of this experiment was to investigate the effects of the duration the temporal location of the interpolated signal on the perception of continuity under monaural presentation. The effect of frequency of the interpolated tone was also evaluated. The results showed that the perception of continuity in the noise was affected by both the duration and frequency of the interpolated tonal signal. The location of the interpolated signal had no significant differential effect on continuity thresholds. [ABSTRACT FROM AUTHOR]

Three experiments are reported that employed 78 normally hearing college students who demonstrated an ability to concentrate on an interrupted white noise that alternated with a tonal burst. The purpose of these experiments was to investigate the effects of the duration of the white noise and the frequency of the tonal burst on the perception of continuity under monaural and dichotic presentation. The effect of the number of noise pulses in the stimulus interval was also investigated. The results showed that under monaural presentation the perception of continuity was affected by both the duration of the noise and the frequency of the tone. Only the duration variable was significant under dichotic presentation. The number of noise pulses in the stimulus interval significantly affected the perception of continuity. [ABSTRACT FROM AUTHOR]