ANALYSIS OF GAZE SHIFT IN-DEPTH IN ALZHEIMERS-DISEASE PATIENTS

Citation
K. Uomori et al., ANALYSIS OF GAZE SHIFT IN-DEPTH IN ALZHEIMERS-DISEASE PATIENTS, IEICE transactions on information and systems, E76D(8), 1993, pp. 963-973
Citations number
NO
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Computer Applications & Cybernetics
ISSN journal
0916-8532
Volume
E76D
Issue
8
Year of publication
1993
Pages
963 - 973
Database
ISI
SICI code
0916-8532(1993)E76D:8<963:AOGSII>2.0.ZU;2-5
Abstract
To clarify the stereopsis disturbance in patients with Alzheimer's dis ease (AD), we analyzed binocular eve movement when subjects shifted th eir gaze between targets at different depths. Subjects are patients wi th Alzheimer's disease, Multi-infarct dementia (MID), or Olivopontocer ebellar atrophy (OPCA), and healthy controls. Targets are arranged in two ways: along the median plane and asymmetrically crossing the media n plane, at distances from the eyes of 1000 mm and 300 mm. When the ta rgets are switched at the onset of a beep, the subjects shifted their gaze to the lit target. The experiment is conducted in a dimly lit roo m whose structure is capable of providing good binocular cues for dept h. In AD subjects, especially in the subjects whose symptoms are moder ate (advanced stage), vergence is limited and the change in the conver gence angle is small, unstable, and non-uniform. These results are dif ferent from those of other patients (MID) and OPCA) or healthy control s and suggest a disturbance of stereopsis in the parietal lobe where A D patients typically have dysfunctions.