1/f-type fluctuation in human visuomotor transformation.
In the absence of vision of the limb, movements toward a visual target exhibit substantial errors which are considered to originate mainly in the visuomotor transformation process. To determine the time-dependent property of human visuomotor transformation, we investigated the error sequences in movements toward visual target using scaling analyses. When subjects could see their controlling limb, the error sequences could not be distinguished from a random sequence. On the other hand, when the controlling limb was invisible, the error sequences were not random in order, but exhibited 1/f-type time correlation. This finding that the variation in human visuomotor transformation shows 1/f-type fluctuation provides a significant index for mathematical modeling and system identification in human visuomotor control.
Miyazaki
Makoto
M
Department of Sensory and Communicative Disorders, Research Institute, National Rehabilitation Center for Persons with Disabilities, 4-1 Namiki, Tokorozawa, Saitama 359-8555, Japan. miyazaki@rehab.go.jp
Nakajima
Yasoichi
Y
Kadota
Hiroshi
H
Chitose
Kazuyoshi
K
Ohtsuki
Tatsuyuki
T
Kudo
Kazutoshi
K
D000328:Adult; D001132:Arm / Q000502:physiology*; D006801:Humans; D008297:Male; D010775:Photic Stimulation / Q000379:methods*; D011597:Psychomotor Performance / Q000502:physiology*