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Related Concept Videos

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.
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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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Visual System01:26

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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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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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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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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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Related Experiment Video

Updated: Jan 15, 2026

Author Spotlight: Unveiling Neural Coding and Mechanisms of Visual Processing in the Superior Colliculus
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Recurrent circuits encode de novo visual center-surround computations in the mouse superior colliculus.

Peng Cui1, Kuisong Song2, Dimitrios Mariatos-Metaxas1

  • 1Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.

Plos Biology
|October 16, 2025
PubMed
Summary

Researchers discovered a new way the superior colliculus (SC) detects visual salience. This surround suppression mechanism in the SC operates independently of cortical input, revealing a novel local circuit for saliency computation.

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Computational Neuroscience

Background:

  • Visual salience detection models often involve center-surround interactions.
  • The precise neural circuits (retinal, cortical, subcortical) underlying these computations are not fully understood due to overlapping functions.

Purpose of the Study:

  • To investigate a de novo collicular mechanism for surround suppression in visual salience detection.
  • To elucidate the local circuit computations within the superficial superior colliculus (SC).

Main Methods:

  • Patterned optogenetics and whole-cell recordings in mouse superficial SC slices.
  • Defined center zones using inputs from channelrhodopsin-expressing retinal ganglion cells.
  • Utilized cell-type-specific trans-synaptic tracing and computational modeling.

Main Results:

  • Optogenetic activation of the surround network suppressed neuronal responses in the center zones.
  • This suppression was found to be excitatory, originating from the withdrawal of center excitation.
  • Demonstrated surround-driven inhibition of local recurrent excitatory circuits within the SC.

Conclusions:

  • Identified a local circuit mechanism for saliency computation within the superior colliculus.
  • This collicular mechanism for surround suppression operates independently of cortical input.
  • Provides new insights into the distributed neural basis of visual salience detection.