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Related Concept Videos

Vision01:24

Vision

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.
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
Accessory Structures of the Eye01:17

Accessory 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...
Depth Perception and Spatial Vision01:15

Depth 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.
Muscles of the Eye01:20

Muscles of the Eye

The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
Extraocular Muscles
The six extraocular muscles surround the eyeball and control its movements. They are responsible for a wide range of eye motions, including looking up, down, left, right, and rotating...

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An oculomotor continuum from exploration to fixation.

Jorge Otero-Millan1, Stephen L Macknik, Rachel E Langston

  • 1Department of Neurobiology, Barrow Neurological Institute, Phoenix, AZ 85013, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 28, 2013
PubMed
Summary

Visual exploration and fixation are not distinct behaviors but exist on a continuum. Eye movement patterns during exploration gradually merge with fixation microsaccades as scene size decreases, suggesting a unified oculomotor model.

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Area of Science:

  • Oculomotor behavior
  • Visual neuroscience
  • Human perception

Background:

  • Classic view posits distinct oculomotor behaviors for visual exploration and fixation.
  • Exploration involves high saccadic rates, while fixation features slower microsaccades.
  • An alternative model proposes a functional continuum between exploration and fixation.

Purpose of the Study:

  • To investigate whether visual exploration and fixation are distinct or part of a continuum.
  • To analyze saccadic eye movement properties across varying scene sizes and viewing conditions.
  • To determine if a single oculomotor model can explain eye movements from exploration to fixation.

Main Methods:

  • Measured human eye movements during fixation on a spot and scanning of natural scenes of varying sizes.
  • Analyzed saccade rates and other saccadic properties as a function of image size.
  • Utilized eye movement simulations to test a unified oculomotor behavior model.

Main Results:

  • Saccade rates decreased with diminishing scene size, merging with microsaccadic rates during fixation.
  • Saccadic properties exhibited a continuum with microsaccadic parameters as image size changed.
  • Simulations supported a single model explaining the saccadic continuum across all image sizes and viewing conditions.

Conclusions:

  • Challenges the dichotomous view of visual exploration and fixation.
  • Suggests visual fixation is a spatially focused form of visual exploration.
  • Proposes a unified model for oculomotor behavior across different visual tasks and scales.