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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...
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.
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...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
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.
Auditory Perception01:17

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

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Related Experiment Video

Updated: Jul 16, 2026

A Two-interval Forced-choice Task for Multisensory Comparisons
07:13

A Two-interval Forced-choice Task for Multisensory Comparisons

Published on: November 9, 2018

Competing neural responses for auditory and visual decisions.

Grit Hein1, Arjen Alink, Andreas Kleinschmidt

  • 1Cognitive Neurology Unit, Johann Wolfgang Goethe-University, Frankfurt am Main, Germany. ghein@berkeley.edu

Plos One
|March 29, 2007
PubMed
Summary

Dividing attention between different tasks, like reading and conversation, is difficult. Auditory tasks suppress visual processing in the brain, even without motor competition, impacting awareness.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Dividing attention between dissimilar tasks is challenging.
  • Understanding the neural basis of attentional interference is crucial for cognitive science.

Purpose of the Study:

  • To investigate the neural mechanisms of attentional interference between auditory and visual tasks.
  • To determine if interference occurs independently of motor response competition.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to monitor brain activity.
  • Simple auditory and visual decision tasks were employed.
  • Neural activity was analyzed during isolated and simultaneous task performance.

Main Results:

  • Overlapping brain activity for isolated auditory and visual tasks was observed in lateral prefrontal, middle temporal, and parietal cortices.
  • Performing an auditory task suppressed activity in prefrontal and middle temporal cortices when a visual stimulus was presented concurrently.
  • Reduced activity in visual cortex correlated with impaired awareness of the visual stimulus.

Conclusions:

  • Auditory decisions interfere with visual processing at multiple neural levels, including prefrontal, middle temporal, and visual cortices.
  • This interference occurs even without competing motor responses.
  • Neural suppression and reduced awareness are key consequences of attentional division between dissimilar tasks.