DISCRIMINATION OF SMALL TIME INTERVALS BETWEEN A VISUAL AND AN AUDITORY SIGNAL.
JOHNS HOPKINS UNIV BALTIMORE MD PSYCHOLOGICAL LAB
Pagination or Media Count:
A display of information which presents the same objective facts to the eyes and ears would be advantageous in certain radar situations. An important problem in the successful application of such a display is the sensitivity of individuals to auditory and visual signals separated by small time intervals. To study this, a series of experiments was performed to test the ability of individuals to detect the coincidence of stimuli presented to the eyes and ears at nearly the same time. An exploratory attempt to make an audio and a video signal coincide on a repeater PPI showed that blips could not be made small enough or separated accurately enough to test the limits of discrimination. Therefore, a special apparatus simulating a PPI type of presentation was constructed to allow accurate positioning of 132 inch dots targets anywhere on a 12 inch display. A rotating pointer sweep of variable speed passed the dots coincident with a click heard in the observers earphones. Author