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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.
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 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...
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...
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
Parallel Processing01:20

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...

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Related Experiment Video

Updated: May 13, 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

Optimal transsaccadic integration explains distorted spatial perception.

Matthias Niemeier1, J Douglas Crawford, Douglas B Tweed

  • 1Department of Physiology, University of Toronto, 1 King's College Circle, Toronto M5S 1A8, Canada.

Nature
|March 7, 2003
PubMed
Summary
This summary is machine-generated.

Transsaccadic integration, the brain's method for building a unified view from eye movements (saccades), is not flawed. New research shows this process uses optimal inference, accurately reflecting human perception and motor actions.

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Last Updated: May 13, 2026

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

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Published on: July 21, 2020

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Area of Science:

  • Neuroscience
  • Computational Vision
  • Cognitive Psychology

Background:

  • The brain constructs a continuous visual perception from discrete eye movements (saccades) through transsaccadic integration.
  • This integration process is traditionally considered flawed due to perceptual distortions and saccadic suppression of displacement (SSD).

Purpose of the Study:

  • To investigate whether transsaccadic integration operates via optimal inference rather than being inherently flawed.
  • To model the visuomotor system's interpretation of visual scenes during saccades.

Main Methods:

  • Simulated a visuomotor system with realistic saccadic eye movements, retinal acuity, motion detection, and eye-position sense.
  • Programmed the model to optimally integrate imperfect sensory and motor data for scene interpretation.
  • Conducted experiments to verify model predictions regarding perception-motor action correlations and perceived spatial distortions.

Main Results:

  • The optimized model exhibited human-like saccadic suppression of displacement (SSD) and spatial perception distortions.
  • The model predicted, and experiments confirmed, tight correlations between perception and motor action, such as increased SSD with less precise eye control.
  • Verified a graded contraction of perceived spatial jumps, consistent with optimal inference.

Conclusions:

  • Transsaccadic integration is best explained as a process of optimal inference, not a flaw.
  • The brain optimally integrates sensory and motor information to construct a coherent and evolving representation of the world.
  • This framework explains perceptual distortions and predicts specific links between visual perception and motor control.