Ocular Search Pattern during Line Bisection Task in Normal Subjects

J Korean Neurol Assoc > Volume 19(2); 2001 > Article

Journal of the Korean Neurological Association 2001;19(2): 96-101.

선 이등분검사에서 정상인의 안구 탐색 패턴

이병화, 박정민 최성혜* 윤수진 정지향 하충건* 나덕렬

성균관대학교 의과대학 삼성서울병원 신경과,인하대학교 의과대학 신경과학교실*

Ocular Search Pattern during Line Bisection Task in Normal Subjects

"Byung Hwa Lee, M.A., Jung-Min Park, M.S., Seong Hye Choi, M.D.*, Soo Jin Yoon, M.D., Jee Hyang Jeong, M.D., Choong-Kun Ha, M.D.*, Duk L. Na, M.D."

Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine Department of Neurology, College of Medicine, Inha University*

Abstract

"Background : The study of ocular search pattern in normal subjects and patients with hemispatial neglect may help understand spatial cognition. However, only a few studies are available that investigated ocular search pattern even in normal controls. The present study was to investigate ocular search pattern of normal subjects during line bisection task. Methods : Nine normal subjects (6 men and 3 women with mean age of 21.8±4.2 years) were requested to fix their eyes on the midpoint of the line that was presented on the monitor. Lines for bisection were varied according to the location (center, right-sided or left-sided) and length (short or long) and each subject performed 6 trials (one trial/condition). Horizontal eye movements were recorded using an infrared video-oculography and were analyzed in terms of the range and the direction of eye movements. R e s u l t s : Average range of fixation during line bisection was 20.1% of entire length that corresponded middle portion of the line. There was no directional preference in searching the line during line bisection task. Conclusions : We expected that normal subjects overtly look at both ends of the line before they bisect the line. On the contrary, they seem to use a strategy such that they directly go to the middle part of the line and then make fine adjustment while looking at both ends of line covertly. J Korean Neurol Assoc 19(2):96~101, 2001 Key Words : Line bisection, Eye movement, Ocular search pattern, Video-oculography, Neglect"