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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.
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
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.
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
Position and Displacement Vectors01:00

Position and Displacement Vectors

To describe the motion of an object, one should first be able to describe its position (where it is at any particular time). More precisely, the position needs to be specified relative to a convenient frame of reference. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference to describe the position of an object in relation to stationary objects on Earth.
Further, several important kinds of...

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Related Experiment Video

Updated: Jul 7, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

How position dependent is visual object recognition?

Dwight J Kravitz1, Latrice D Vinson, Chris I Baker

  • 1Laboratory of Brain and Cognition, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, USA.

Trends in Cognitive Sciences
|February 12, 2008
PubMed
Summary
This summary is machine-generated.

Object recognition may depend on retinal position, challenging theories of position-independent visual processing. Current evidence suggests position plays a role, but its exact function in object recognition remains unclear.

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Area of Science:

  • Cognitive Neuroscience
  • Computational Vision
  • Psychology

Background:

  • Object recognition is widely assumed to be invariant to retinal position.
  • This assumption underpins many theories and computational models of visual object recognition.
  • Recent behavioral and physiological data challenge the notion of position independence.

Purpose of the Study:

  • To review the behavioral literature on the role of retinal position in object recognition.
  • To evaluate the evidence for and against position-independent object representations.
  • To explore computational and physiological perspectives on this issue.

Main Methods:

  • Comprehensive review of existing behavioral studies on visual object recognition and retinal position.
  • Analysis of potential confounds in studies reporting position effects.
  • Integration of computational and physiological viewpoints.

Main Results:

  • Many studies report decreased object recognition performance with small retinal translations (e.g., 0.5 degrees).
  • Significant confounds complicate the interpretation of these findings.
  • Little robust evidence supports the existence of position-independent object recognition.

Conclusions:

  • The assumption of position-independent object recognition is not well-supported by current evidence.
  • Retinal position likely plays a role in object recognition.
  • The precise contribution of retinal position to object recognition remains an open question.