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Related Concept Videos

Visual System01:26

Visual System

571
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...
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Vision01:24

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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.
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Parallel Processing01:20

Parallel Processing

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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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Motor and Sensory Areas of the Cortex01:14

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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....
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Related Experiment Video

Updated: Jun 25, 2025

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Differential cortical and subcortical visual processing with eyes shut.

Nicholas G Cicero1,2,3, Michaela Klimova4, Laura D Lewis2,3,5,6

  • 1Graduate Program in Neuroscience, Boston University, Boston, Massachusetts, United States.

Journal of Neurophysiology
|May 29, 2024
PubMed
Summary
This summary is machine-generated.

Closing your eyes doesn't completely block visual processing. The early visual system (LGN and V1) maintains responses, but downstream areas like extrastriate cortex attenuate signals when eyes are closed.

Keywords:
LGNeye closurefMRIluminancevisual cortex

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Eyelid closure partially transmits light, allowing coarse luminance processing.
  • The precise impact of eye closure on early visual system processing is not well understood.

Purpose of the Study:

  • To investigate how visual processing is modulated by eye closure.
  • To determine the effects of eyelid closure on responses in the visual thalamus and cortex.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants viewed flickering visual stimuli at high and low temporal contrasts with eyes open and closed.

Main Results:

  • The lateral geniculate nucleus (LGN) and primary visual cortex (V1) showed similar responses with eyes open or closed.
  • Extrastriate visual areas (V2, V3) exhibited significantly attenuated blood oxygenation level-dependent (BOLD) responses when eyes were closed, irrespective of stimulus contrast.

Conclusions:

  • Eye closure results in a distinct pattern of visual processing, not a simple attenuation.
  • Early visual processing stages (LGN, V1) preserve stimulus information, which is then gated off in downstream visual cortex (V2, V3).