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Related Concept Videos

Vision01:24

Vision

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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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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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Association Areas of the Cortex01:21

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Somatosensory, Motor, and Association Cortex01:24

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Visual System01:26

Visual System

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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.
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Related Experiment Video

Updated: Dec 22, 2025

A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
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Projections between visual cortex and pulvinar in the rat.

Leo R Scholl1,2, Andrzej T Foik2, David C Lyon2

  • 1Department of Cognitive Sciences, School of Social Sciences, University of California, Irvine, California, USA.

The Journal of Comparative Neurology
|May 4, 2020
PubMed
Summary
This summary is machine-generated.

Researchers investigated the extrageniculate visual pathway in rats using rabies virus tracing. Findings suggest the pulvinar modulates higher visual cortex more than primary visual cortex (V1).

Keywords:
RRID:AB_2307445RRID:Addgene_32633RRID:CVCL_1915RRID:RGD_2308852extrageniculate pathwaylateral posterior thalamic nucleuspulvinarrabies virusratthalamusvisual cortex

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Area of Science:

  • Neuroscience
  • Visual System Research
  • Mammalian Neuroanatomy

Background:

  • The extrageniculate visual pathway's circuitry remains largely unknown.
  • The pulvinar nucleus is hypothesized to regulate cortical information flow and guide visual actions.

Purpose of the Study:

  • To elucidate the neural circuitry of the extrageniculate visual pathway in rats.
  • To investigate the role of the pulvinar in modulating visual cortical activity.

Main Methods:

  • Retrograde tracing using modified rabies virus injected into the visual cortex and pulvinar of Long-Evans rats.
  • Analysis of cellular projections to different visual cortical areas (V1 and higher visual cortex).

Main Results:

  • A smaller population of cells projected from the pulvinar to the primary visual cortex (V1).
  • A significantly larger population of cells projected from the pulvinar to higher visual cortical areas.
  • Reciprocal projections between the pulvinar and visual cortex mirrored this distribution.

Conclusions:

  • The pulvinar's direct influence on rodent primary visual cortex (V1) may be less significant than previously assumed.
  • The pulvinar appears to play a more substantial role in modulating higher visual processing areas.
  • This study refines our understanding of visual information processing in the rodent brain.