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関連する概念動画

Vision01:24

Vision

59.2K
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.
59.2K
Visual System01:26

Visual System

1.6K
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...
1.6K
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

2.2K
Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
2.2K
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

6.7K
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....
6.7K
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

1.7K
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.
1.7K
Somatosensation01:33

Somatosensation

42.8K
The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
42.8K

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MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
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MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions

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センソモーター体験は,視界入力をコース・ディレクション・ネットワークにマップします.

Yvette E Fisher1, Jenny Lu1, Isabel D'Alessandro1

  • 1Department of Neurobiology, Harvard Medical School, Boston, MA, USA.

Nature
|November 22, 2019
PubMed
まとめ
この要約は機械生成です。

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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関連する実験動画

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科学分野:

  • 神経科学
  • 動物 の 行動

背景:

  • ドロソフィラのコンパスニューロンは 自律的な動きを統合して 方向を推定します
  • Rニューロンがインプットを媒介する 視覚的なヒントは方向の精度を高めます
  • コンパスネットワークに視覚的なシグナルを統合するメカニズムは不明です.

研究 の 目的:

  • ドロソフィラのコンパスニューロンネットワークに 視覚信号がどのように統合されているかを調べます
  • Rニューロンがコンパスニューロンに視覚入力を媒介する役割を決定する.
  • コンパスシステムの視覚処理の可塑性を明らかにする.

主な方法:

  • ドロソフィラの体内全細胞記録
  • カルシウム画像を集めました
  • 仮想現実環境の探索

主要な成果:

  • 視覚信号はコンパスニューロンのシナプス阻害を誘発し Rニューロンによって媒介されます
  • コンパスニューロンは 特定の視覚的な位置感を示します
  • 視覚的に誘発された阻害パターンは 環境の変化で再編成され コンパスの座標枠が変化します

結論:

  • 視覚的に誘発された阻害の関連性のある長期的なシナプス抑制が,可塑性の基礎です.
  • この可塑性は 方向性のある自己運動と 外部からのシグナルを 調和させています
  • 発見は,ナビゲーションのためのアトラクターダイナミクスと組み合わせた,アソシエティブな可塑性のモデルをサポートします.