scholarly journals Direction constancy

1972 ◽  
Vol 11 (2) ◽  
pp. 175-178 ◽  
Author(s):  
A. Lewis Hill
Keyword(s):  
Direction Constancy

A theory of visual stability across saccadic eye movements

1994 ◽  
Vol 17 (2) ◽  
pp. 247-258 ◽  
Author(s):  
Bruce Bridgeman ◽  
A. H. C. Van der Heijden ◽  
Boris M. Velichkovsky
Keyword(s):  
Eye Movements ◽  
Saccadic Eye Movements ◽  
Visual Direction ◽  
Visual Stability ◽  
Perceptual Stability ◽  
Adequate Information ◽  
Psychological Evidence ◽  
Calibration Solution ◽  
Final Question ◽  
Direction Constancy

AbstractWe identify two aspects of the problem of maintaining perceptual stability despite an observer's eye movements. The first, visual direction constancy, is the (egocentric) stability of apparent positions of objects in the visual world relative to the perceiver. The second, visual position constancy, is the (exocentric) stability of positions of objects relative to each other. We analyze the constancy of visual direction despite saccadic eye movements.Three information sources have been proposed to enable the visual system to achieve stability: the structure of the visual field, proprioceptive inflow, and a copy of neural efference or outflow to the extraocular muscles. None of these sources by itself provides adequate information to achieve visual direction constancy; present evidence indicates that all three are used.Our final question concerns how information processing operations result in a stable world. The three traditionally suggested means have been elimination, translation, or evaluation. All are rejected. From a review of the physiological and psychological evidence we conclude that no subtraction, compensation, or evaluation need take place. The problem for which these solutions were developed turns out to be a false one. We propose a “calibration” solution: correct spatiotopic positions are calculated anew for each fixation. Inflow, outflow, and retinal sources are used in this calculation: saccadic suppression of displacement bridges the errors between these sources and the actual extent of movement.

scholarly journals Visual direction constancy across eyeblinks

2009 ◽  
Vol 71 (7) ◽  
pp. 1607-1617 ◽  
Author(s):  
J. S. Higgins ◽  
D. E. Irwin ◽  
R. F. Wang ◽  
L. E. Thomas
Keyword(s):  
Visual Direction ◽  
Direction Constancy

Alhazen's Neglected Discoveries of Visual Phenomena

Perception ◽  
1996 ◽  
Vol 25 (10) ◽  
pp. 1203-1217 ◽  
Author(s):  
Ian P Howard
Keyword(s):  
Seventeenth Century ◽  
Visual Perception ◽  
Visual Motion ◽  
Eleventh Century ◽  
Binocular Disparity ◽  
Image Formation ◽  
Visual Pathways ◽  
Eye Muscles ◽  
Visual Phenomena ◽  
Direction Constancy

The first three books of the Book of Optics written by Alhazen in Cairo in the eleventh century were translated into English by A I Sabra in 1989. Book I deals with optics, the structure of the eye, image formation in the eye, and with the visual pathways. This book inspired all other books on optics from the thirteenth to the seventeenth century and formed the basis upon which Kepler solved the problem of image formation. However, Alhazen's work contained in Books II and III has been almost totally ignored. These two books contain an account of hundreds of observations and experiments carried out by Alhazen on a broad range of topics which are now studied under the heading of visual perception. He clearly enunciated many of the fundamental principles which are credited to scientists living in the last two hundred years, including a theory of unconscious inference; the law of equal innervation of the eye muscles; the principles of binocular direction; constancy of size, shape, and colour; induced visual motion; the vertical horopter; the fusional range of binocular disparity; and many others.

Direction Constancy in the Oculomotor System

1993 ◽  
Vol 2 (5) ◽  
pp. 143-147 ◽  
Author(s):  
Paul Dassonville ◽  
John Schlag ◽  
Madeleine Schlag-Rey
Keyword(s):  
Oculomotor System ◽  
Direction Constancy

scholarly journals Delineating the perceived ground surface from a direction constancy rule

2010 ◽  
Vol 2 (7) ◽  
pp. 716-716 ◽  
Author(s):  
T. L. Ooi ◽  
Z. J He ◽  
B. Wu
Keyword(s):  
Ground Surface ◽  
Direction Constancy
Sign in / Sign up

Export Citation Format

Share Document