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関連する概念動画

Vision01:24

Vision

61.7K
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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Graded Potential01:19

Graded Potential

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Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
Graded potentials fall into two categories: depolarizing and hyperpolarizing. Depolarizing graded potentials typically occur when sodium (Na+) or...
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Neural Circuits01:25

Neural Circuits

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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

9.3K
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....
9.3K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

11.9K
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...
11.9K
Visual System01:26

Visual System

2.3K
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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Cross-Modal Multivariate Pattern Analysis
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Cross-Modal Multivariate Pattern Analysis

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視覚皮質の空間的和算のための神経回路.

Hillel Adesnik1, William Bruns, Hiroki Taniguchi

  • 1Howard Hughes Medical Institute, Center for Neural Circuits and Behavior, Neurobiology Section and Department of Neuroscience, University of California San Diego, La Jolla, California 92093-0634, USA.

Nature
|October 13, 2012
PubMed
まとめ
この要約は機械生成です。

皮質回路は,視覚的な周囲抑制に寄与する. 阻害性ソマトスタチン発現性ニューロン (SOMs) は,周囲の刺激によって活動性を高め,ピラミッド細胞の抑制を促します.

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Using Looming Visual Stimuli to Evaluate Mouse Vision
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関連する実験動画

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科学分野:

  • 神経科学は神経科学である.
  • 視覚野研究 視覚野の研究
  • ニューロンの回路

背景:

  • 感覚刺激に対する反応は,大脳皮質において文脈に依存している.
  • 周りの抑制は,受容場-周りの刺激が中央刺激の反応を弱める場合,重要な視覚処理現象です.
  • 視覚処理の初期段階と比較して,皮質回路が周囲の抑制に与える貢献は依然として議論の余地があります.

研究 の 目的:

  • 視覚環境抑制における皮質回路の役割を調査する.
  • 周囲刺激中に視覚野の特定の阻害性ニューロンタイプの応答特性を決定する.
  • ソマトスタチンを発現するニューロンが周囲抑制に与える機能的貢献を明らかにする.

主な方法:

  • マウスの視覚皮質におけるin vivo電気生理学.
  • ソマトスタチンを発現する神経細胞の活性障害.
  • 視覚的刺激に対するニューロン反応の分析,受容場環境の変動.

主要な成果:

  • 表面層のソマトスタチン発現抑制ニューロン (SOMs) は,ピラミッド細胞とは異なり,受容場周辺刺激によって活性が増加します.
  • このSOM反応は,水平皮質軸索からの好ましい刺激によって引き起こされる.
  • SOMの活動が混乱すると,ピラミッド細胞周りの抑制が著しく影響され,その役割が確認されます.

結論:

  • 皮質回路,特にSOMを含む回路は,視覚的な周囲抑制を媒介する上で重要な役割を果たします.
  • ソマトスタチンを発現する阻害性ニューロンは,この皮質計算に重要な貢献者であると特定されています.
  • この研究は,周囲抑制のための特定の皮質回路機構を確立し,遺伝的に定義された抑制性ニューロンタイプに機能を割り当てます.