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Related Concept Videos

Vision01:24

Vision

53.2K
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.
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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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Related Experiment Video

Updated: Jun 28, 2025

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Modular horizontal network within mouse primary visual cortex.

Andreas Burkhalter1, Weiqing Ji1, Andrew M Meier1,2

  • 1Department of Neuroscience, Washington University School of Medicine, St. Louis, MO, United States.

Frontiers in Neuroanatomy
|April 23, 2024
PubMed
Summary
This summary is machine-generated.

Local horizontal connections in mouse primary visual cortex (V1) interact with feedback inputs in Layer 1 (L1). These interactions, particularly in M2-interpatches, shape visual processing of motion.

Keywords:
M2 muscarinic acetylcholine receptorclustered apical dendritesclustered inputshorizontal connectionslayer 1mousepatchesprimary visual cortex

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Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Computational Neuroscience

Background:

  • Feedback connections from higher cortical areas and local horizontal connections in primary visual cortex (V1) are crucial for contextual processing.
  • Layer 1 (L1) of V1 integrates feedback and local inputs onto projection neuron dendrites, linking external stimuli with internal information.

Purpose of the Study:

  • To investigate the overlap and interaction of feedback and local horizontal connections within Layer 1 of the mouse primary visual cortex (V1).
  • To elucidate the role of these interactions in processing visual information related to object and self-motion.

Main Methods:

  • Utilized anterograde and retrograde viral tracers to map local horizontal connections within mouse V1.
  • Characterized the distribution and termination patterns of long-range horizontal connections, identifying M2 muscarinic acetylcholine receptor-negative (M2-) interpatches.
  • Examined the overlap of these connections with apical dendrites of L2/3 and L5 projection neurons in L1.

Main Results:

  • Identified two types of local horizontal connections: short, image-point-specific connections, and long, patchy connections extending into the receptive field surround.
  • Long horizontal connections preferentially terminated in M2-interpatches.
  • Overlapping inputs from feedback networks (LP thalamus, medial dorsal stream) and local horizontal connections were observed in M2-interpatches with apical dendrites, forming module-selective loops.

Conclusions:

  • Layer 1 (L1) of the primary visual cortex (V1) contains distinct M2-interpatches where local and feedback inputs converge.
  • These M2-interpatches facilitate interactions between topographically distant visual representations, suggesting a role in integrating contextual information.
  • The findings indicate that interactions within M2-interpatches are critical for processing visual inputs related to object and self-motion.