[The effect of posterior-neck-muscle vibration on apparent straight-ahead and visual localization of targets].
We examined the time course of apparent motion and apparent displacement of a visual target, and also the horizontal deviation of apparent straight-ahead related to left-posterior neck-muscle vibration. In Experiment 1, eight observers verbally judged the apparent motion and displacement of a visual target for 60 s from prior to the vibration to after its offset. We found that rightward apparent motion was an almost identical in magnitude during the vibration and disappeared within 20 s after the vibration offset. In contrast, rightward apparent displacement gradually increased during the vibration, and was sustained over 40 s after the vibration offset. In Experiment 2, five observers manually pointed to the position of a visual point in the median plane; the mean pointed position in the vibration condition was found to deviate maximally 3 degrees to the right of the mean pointed position in the control condition. In Experiment 3, the same observers closed their eyes and pointed to the apparent straight-ahead; the mean pointed positions did not differ between the vibration and control conditions.
Konishi
Taku
T
Department of Psychology, Faculty of Letters, Kobe University, Japan. konitaku@lit.kobe-u.ac.jp
Takenaka
Takeshi
T
Suetsugu
Akira
A
Matsushima
Takaji
T
D000328:Adult; D005260:Female; D006801:Humans; D007088:Illusions; D008297:Male; D009334:Neck Muscles / Q000502:physiology*; D011434:Proprioception / Q000502:physiology*; D013028:Space Perception / Q000502:physiology*; D014732:Vibration