Abstract:

In the current study, five participants were asked to describe the sequence of two sounds that originated from the front and back hemifield, relative to the subject. The stimuli were 50-ms broadband noise pulses presented at a sound pressure level of 70 dB A. Across sessions, the distance between speakers varied from 78 to 234 in. Within sessions, the delay between the onset (interstimulus onset interval or ISOI) of the first and second speakers varied from 4 to 150 ms. Both ISOI and inter-speaker distance affected the participant performance on the task [f(8,32)=8.21, p<0.001]. It is clear from these results that continuous movement originating from the front and back hemifields [f(2,8)=14.06, p<0.001] occurs over the same time intervals as on the horizontal azimuth. Implications for motion research will also discussed.