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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.
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.
Color Vision01:24

Color 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.
Gestalt Principles of Perception01:21

Gestalt Principles of Perception

Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
Perception01:28

Perception

Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
Bottom-up processing begins at the sensory level, where receptors detect external environmental stimuli. These could include the tactile sensation of...

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Related Experiment Video

Updated: Jun 20, 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

Expectation (and attention) in visual cognition.

Christopher Summerfield1, Tobias Egner

  • 1Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford, OX1 3UD, UK. christopher.summferfield@psy.ox.ac.uk

Trends in Cognitive Sciences
|September 1, 2009
PubMed
Summary
This summary is machine-generated.

Visual cognition is limited by brain processing capacity and ambiguous information. This study reviews how attention and expectation, two key mechanisms, help overcome these limitations, with a focus on the neurobiology of visual expectation.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Visual cognition faces limitations due to finite computational capacity and information ambiguity.
  • Attention and expectation are crucial mechanisms that mitigate these processing burdens.
  • While attention has been widely studied, visual expectation remains relatively underexplored.

Purpose of the Study:

  • To review recent research on the neurobiology of visual expectation.
  • To contrast the findings on visual expectation with existing literature on attention.
  • To explore the overlap, differences, and interactions between attention and expectation in visual perception.

Main Methods:

  • Literature review of recent neurobiological studies on visual expectation.
  • Comparative analysis of findings from attention and expectation research.
  • Synthesis of current understanding of how these two mechanisms influence visual perception.

Main Results:

  • Recent work is beginning to delineate the neurobiology of visual expectation.
  • Attention prioritizes stimuli based on motivational relevance.
  • Expectations constrain visual interpretation based on prior likelihood.

Conclusions:

  • Both attention and expectation are vital for efficient visual cognition.
  • Understanding the neurobiology of expectation is crucial for a complete picture of visual perception.
  • Further research is needed to fully elucidate the interplay between attention and expectation.