POSITION DEPENDENCY OF RAPIDLY INDUCED SACCADE DISCONJUGACY

Citation
T. Eggert et Z. Kapoula, POSITION DEPENDENCY OF RAPIDLY INDUCED SACCADE DISCONJUGACY, Vision research, 35(23-24), 1995, pp. 3493-3503
Citations number
20
Categorie Soggetti
Neurosciences,Ophthalmology
Journal title
ISSN journal
00426989
Volume
35
Issue
23-24
Year of publication
1995
Pages
3493 - 3503
Database
ISI
SICI code
0042-6989(1995)35:23-24<3493:PDORIS>2.0.ZU;2-T
Abstract
We tested the ability of normal subjects to alter the conjugacy of the ir saccades in a position-specific manner, Five subjects dichoptically viewed a stereogram produced by two random-dot patterns, They immedia tely perceived a three-dimensional wedge with its apex closer to them, They were asked to saccade for 15 min back and forth between the apex and two lateral dots of the wedge, For fixation sequences between cen tre-right-centre, saccades immediately became larger in the right eye, For sequences between centre-left-centre, saccades immediately became larger in the left eye, For two subjects this non-monotonic position-s pecific disconjugacy compensated for the disparity of the stereogram a lmost perfectly, The disconjugacy persisted even under monocular viewi ng of one of the random-dot patterns. It diminished or disappeared imm ediately, however, when the random-dot pattern was shifted on the scre en, We suggest the existence of a fast learning mechanism capable of p roducing ;position-specific disconjugacy by associating saccades with disparity, Such a mechanism would use a visual reference rather than t he position of the eyes in the orbit.