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Vision Research 40 (2000) 29852998 Depth selectivity of vertical fusional mechanisms

Summary: Vision Research 40 (2000) 29852998
Depth selectivity of vertical fusional mechanisms
R.S. Allison *, I.P. Howard, X. Fang
Centre for Vision Research, York Uni6ersity, 103 Farquharson, Toronto, Ontario, Canada M3J 1P3
Received 25 January 2000; received in revised form 5 May 2000
We measured the ability to fuse dichoptic images of a horizontal line alone or in the presence of a textured background with
different vertical disparity. Nonius-line measurements of vertical vergence were also obtained. Diplopia thresholds and vertical
vergence gains were much higher in response to an isolated vertically disparate line than to one with a zero vertical-disparity
background. The effect of the background was maximum when it was coplanar with the target and decreased with increasing
relative horizontal disparity. We conclude that vertical disparities are integrated over a restricted range of horizontal disparities
to drive vertical vergence. 2000 Elsevier Science Ltd. All rights reserved.
Keywords: Vertical vergence; Fusion; Integration; Diplopia
1. Introduction
For any posture of the eyes, only a subset of points
on an extended surface fall on corresponding points in
the two retinae -- those that lie on the point horopter.
Binocular single vision is attained by a combination of
vergence and sensory fusion. Sensory fusion creates a


Source: Allison, Robert - Department of Computer Science, York University (Toronto)


Collections: Computer Technologies and Information Sciences; Biology and Medicine