THE EFFECT OF VISUAL STIMULATION ON THE DURATION OF POSTROTATIONAL APPARENT MOTION EFFECTS.
Rept. no. 1,
TULANE UNIV NEW ORLEANS LA
Pagination or Media Count:
In order to investigate the effect of a visual stimulus upon postrotational nystagmus, equipment was set up which provided for rotation at 20 rpm. Two experimental conditions were planned 1 In condition A, Ss were rotated for 100 seconds in a counterclockwise direction. They were required to observe the apparent motion of a dimly light tridimensional target which moved with the rotating equipment. There was no illumination save from that of the target. 2 In condition B the rotation was at the same rpm and two seconds after cessation of rotation the overhead light was turned on for a period of five seconds. S was required under both conditions to observe the apparent motion of the target during and after rotation. The data were treated by the method of analysis of variance. From the results the following conclusions were drawn 1 Upon cessation of rotation the apparent motion of a tri-dimensional target of dim illumination in an otherwise dark room is inhibited during a period of illumination of the room. 2 The duration of postrotational apparent motion is significantly decreased by the temporary period of illumination. 3 From trial to trial there is a significant decrement in the duration of postrotational apparent movement habituation even in those trials where there is no overhead illumination.