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関連する概念動画

Vision01:24

Vision

58.8K
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.
58.8K
Visual System01:26

Visual System

1.4K
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...
1.4K
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

6.0K
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....
6.0K
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

1.5K
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
1.5K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

9.0K
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...
9.0K
Association Areas of the Cortex01:21

Association Areas of the Cortex

7.9K
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:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
7.9K

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Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping
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Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

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視覚皮質の方向選択性と一致する

L Federico Rossi1, Kenneth D Harris2, Matteo Carandini3

  • 1UCL Institute of Ophthalmology, University College London, London, UK. federico.rossi@ucl.ac.uk.

Nature
|November 12, 2020
PubMed
まとめ
この要約は機械生成です。

視覚皮質のニューロン選択性は,刺激と抑制の接続の正確な空間パターンから生じ,シナプス前ニューロン選択性から生じません. この回路のモチーフは 感覚処理において 定理的かもしれない.

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Cross-Modal Multivariate Pattern Analysis
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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex

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関連する実験動画

Last Updated: Nov 30, 2025

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Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

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Cross-Modal Multivariate Pattern Analysis
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Cross-Modal Multivariate Pattern Analysis

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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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科学分野:

  • 神経科学
  • 計算神経科学
  • システム神経科学

背景:

  • 神経応答の選択性は,刺激と抑制の相互作用によって形成されます.
  • 主要視野皮質では,オリエンテーションと方向性のための層2/3のニューロン選択性は,同様に選択的な皮質内入力と伝統的に関連しています.
  • しかし,刺激的なインプットには様々な好みがあり,抑制的なインプットには選択性が欠けることがあります.

研究 の 目的:

  • ネズミの視覚皮質の2/3層の神経への刺激性および抑制性皮質内接続の正確な空間的組織を調査する.
  • 個々の選択性ではなく,入力の空間的配置がニューロン応答の選択性の根底にあるかどうかを判断する.
  • 感覚処理における観測された回路モチーフの潜在的正規性を探求する.

主な方法:

  • 個々の層2/3のピラミッドニューロンに刺激的および阻害的インプットをラベルし,機能的にイメージする狂犬病の追跡技術を使用した.
  • 前シナプスニューロンと後シナプスニューロンの空間的分布と接続パターンを分析した.
  • インプット集合の空間的移動と,ポストシナプスニューロンの方向選択性を相関させた.

主要な成果:

  • プレシナプス刺激性ニューロンは,2/3と4の層で,ポストシナプスニューロンの好ましい方向で共軸的に分布し,好ましい方向の反対の領域を好むことが判明した.
  • プレシナプス抑制ニューロンは,層2/3のポストシナプスニューロンの近く,そしてその好ましい方向の先にある.
  • 後シナプス神経の方向選択性は前シナプス神経の選択性とは無関係だったが,刺激と阻害のインプットの空間的配置と相関していた.

結論:

  • 前シナプス的な選択性ではなく,刺激的および阻害的皮質内接続の正確な空間的パターンは,視覚皮質の2/3層のニューロン応答の選択性を決定する.
  • 観察された非対称な接続性,刺激的および抑制的入力のための明確な空間的配置は,網膜の方向選択性に見られるメカニズムを反映しています.
  • これは,感覚処理経路の方向選択性を確立するための潜在的に正規の回路モチーフを示唆する.