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Related Concept Videos

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...
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"...
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.
The Anchoring-and-Adjustment Heuristic01:25

The Anchoring-and-Adjustment Heuristic

In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the $2,000...
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,...

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Related Experiment Video

Updated: May 8, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Collinear integration affects visual search at V1.

Hiu Mei Chow1, Li Jingling, Chia-huei Tseng

  • 1Department of Psychology, University of Hong Kong, Hong Kong.

Journal of Vision
|August 31, 2013
PubMed
Summary
This summary is machine-generated.

Perceptual grouping impacts visual search. Collinear contour integration before binocular fusion, not after, impairs search performance, suggesting early attention interaction in V1.

Keywords:
V1binocular fusioncollinearityperceptual groupingvisual search

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Area of Science:

  • Visual perception
  • Cognitive neuroscience
  • Attention research

Background:

  • Perceptual grouping is crucial for figure-ground segregation and attention.
  • Collinear grouping in visual search impairs target detection.
  • The precise stage where grouping affects attention remains unclear.

Purpose of the Study:

  • To investigate whether collinear contour integration interacts with visual search before or after binocular fusion.
  • To determine the neural locus of perceptual grouping's interference with selective attention.

Main Methods:

  • Participants performed a visual search task with collinear and noncollinear distractors.
  • A binocular rivalry paradigm was used, presenting parts of the collinear contour to each eye separately.
  • The critical length for search impairment was identified (five or nine elements, not one).

Main Results:

  • Search impairment was observed with collinear distractors of five or nine elements, but not one.
  • No search impairment occurred when collinear contour extension was presented to only one eye before fusion.
  • Contour extension after binocular fusion enhanced the collinearity effect on attention.

Conclusions:

  • Collinear information influences visual search behavior prior to binocular fusion.
  • Attention interacts with perceptual grouping as early as the V1 (primary visual cortex).
  • Binocular fusion modulates, but does not initiate, the attentional effects of collinearity.