PULSE RATE COMPARISONS BETWEEN FLICKER AND INTERMITTENT TONE.
HOFSTRA UNIV HEMPSTEAD N Y
Pagination or Media Count:
In a study of Shipley 1964 Ss were asked to indicate when a pulsed auditory stimulus flutter appeared different in pulse rate from a pulsed visual stimulus flicker. On each trial, both stimuli were initially set at the same rate, between 2 and 10 pulses per second, and S changed flutter rate until the flutter appeared different from the flicker. Preliminary data for the present study indicated that Ss perceived both stimuli at the same rate when the difference between flicker and flutter was actually over 100 times as great as Shipley found to be the average change in auditory rate. In addition, on some trials, Ss initially perceived the two stimuli as different when in fact they were equated. When Ss expected to perceive the stimuli the same, the stimuli appeared the same. Only when the method of adjustment was used did the data agree with Shipleys. The data indicated that a Ss are more accurate at pulse rates below four pulses per second, and become less accurate as pulse rate increases, b Ss are better able to discriminate between the two stimuli when the auditory pulse rate is lower, than when the visual pulse rate is lower, and c the method of constant stimuli yields much different data on intersensory rate comparisons between flicker and pulsed tone, than does the method of adjustment. Author