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Related Concept Videos

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...
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.
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...
Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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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.
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.

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Related Experiment Video

Updated: May 9, 2026

Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes
09:27

Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes

Published on: January 19, 2024

Tracking the first two seconds: three stages of visual information processing?

Jane Jacob1, Bruno G Breitmeyer, Melissa Treviño

  • 1Department of Psychology, University of Houston, Houston, TX, 77204-5022, USA, jjacob9@uh.edu.

Psychonomic Bulletin & Review
|July 24, 2013
PubMed
Summary

This study reveals distinct stages of visual information processing. Priming tasks rely on brief iconic memory, while comparison tasks involve iconic visible persistence, iconic informational persistence, and visual working memory.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception

Background:

  • Understanding the temporal dynamics of visual information processing is crucial for cognitive science.
  • Previous research suggests multiple stages in how the brain processes visual stimuli shortly after presentation.

Purpose of the Study:

  • To compare visual priming and comparison tasks to delineate information processing stages within the initial 2 seconds of stimulus onset.
  • To investigate the roles of iconic memory and visual working memory in different visual tasks.

Main Methods:

  • Participants performed visual priming and comparison tasks with a 13-ms prime and a 40-ms probe at varying stimulus onset asynchronies (SOAs).
  • Task performance (speed and accuracy) was measured to assess information processing.
  • Analysis focused on the relationship between SOA and task performance to identify processing stages.

Main Results:

  • Priming effects peaked at 133 ms SOA and disappeared by 700 ms, suggesting reliance on short-term visuosensory (iconic) memory.
  • Comparison task effects showed a multiphasic pattern with maxima at 0 ms, 240 ms, and 1200 ms, and minima at 133 ms and 720 ms.
  • These distinct patterns indicate different memory systems are engaged depending on the task demands.

Conclusions:

  • The findings support a three-stage model of stimulus processing: iconic visible persistence, iconic informational persistence, and visual working memory.
  • The priming task primarily utilizes the first two stages, while the comparison task engages all three.
  • These processing stages are comparable to those observed in other cognitive tasks, including those related to the attentional blink.