Related Experiment Video
Updated: Aug 15, 2026
14:34
How to Create and Use Binocular Rivalry
Published on: November 11, 2010
Capture of the visual direction of monocular objects by adjacent binocular objects
1Helmholtz Instituut, Utrecht University, The Netherlands. c.j.erkelens@fys.ruu.nl
Vision Research
|July 1, 1997
Summary
Binocular visual direction rules fail for moving objects due to significant eye fixation errors. Perceived direction of monocular objects is instead captured by adjacent binocular objects, impacting eye position measurements.
Area of Science:
- Vision science
- Neuroscience
- Perception
Background:
- Traditional studies on binocular visual direction focus on stationary objects, assuming perfect eye fixation.
- Vergence errors are small for stationary targets but significantly larger for moving objects.
Purpose of the Study:
- To examine existing rules of binocular visual direction under dynamic viewing conditions with moving objects.
- To investigate the impact of fixational errors on perceived visual direction.
Main Methods:
- Objective eye movement measurement using the scleral coil technique.
- Subjects viewed oscillating stereograms with a monocular line in the gap and adjusted its motion amplitude.
- Analysis of perceived line motion and corresponding retinal errors.
Main Results:
- Subjects made substantial fixational errors tracking oscillating elements.
- Settings for perceived line stationarity deviated from geometric predictions, especially in wider gaps.
- Existing rules for binocular visual direction of monocular objects were refuted.
Conclusions:
- Perceived direction of monocular objects is not solely determined by object and eye geometry.
- Binocular visual direction of monocular objects is influenced ('captured') by adjacent binocular objects.
- This 'binocular capture' phenomenon affects the reliability of nonius lines for indicating eye position.
Related Concept Videos
01:24Vision
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
01:17Accessory Structures of the Eye
Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
01:15Depth Perception and Spatial Vision
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
01:24Color Vision
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.