視覚空間は,目の動きの前に前頭前皮質で圧縮されます
Marc Zirnsak1, Nicholas A Steinmetz2, Behrad Noudoost2
11] Department of Neurobiology, Stanford University School of Medicine, Stanford, California 94305, USA [2] Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305, USA.
Nature
|March 28, 2014
まとめ
目の動きの間,前頭前皮質の視覚受容場 (RF) は,網膜の移動を予測するのではなく,ターゲットに収束します. この収束は視覚的知覚に影響を与え,視線制御を導く.
科学分野:
- 神経科学は神経科学である.
- コグニティブ・サイエンス コグニティブ・サイエンス
- 視覚的知覚 視覚的知覚
背景:
- サッカディックな眼の動きは視線をシフトさせ,網膜の画像の移動を引き起こします.
- 視覚受容場 (RF) の予測的リマッピングは,視覚の安定性を維持するために仮定されています.
- RFリマッピングに関する以前の証拠は,主にポストサッカディック位置に焦点を当てていました.
研究 の 目的:
- サッカード準備中に前頭前神経のRFの行動を調査する.
- RFがプレアカディカルにリマッピングすることによって網膜の移転を予測するかどうかを判断する.
- 目の動き中に視力の安定を支える神経メカニズムを理解する.
主な方法:
- 固定とサッカード準備中のサルにおけるマルチエレクトロド記録.
- 目の動きの前に,そしてその後,前頭前神経細胞の視覚的RFをマッピングする.
- 網膜中心空間のRFシフトとサッカディックターゲットへの収束を分析する.
主要な成果:
- 前頭前部のRFは,動きが始まる前にサッカディックターゲットの方向に収束し,最大18度までシフトしました.
- RF収束は,ターゲット領域の刺激に反応するRFの割合を3倍に増加させた.
- サッカディック前刺激はサッカディックターゲットに向かって誤って位置づけられ,人間の知覚を反映した.
結論:
- 前頭前皮質の視覚RFは,サッカデスの前の再マッピングを通じて網膜の移転を予測することはできません.
- RF収束は,目の動きの準備中にターゲット空間の優先認識を反映しています.
- このメカニズムは,サッカデスの間,視力の安定と視線のコントロールに貢献します.
関連する概念動画
01:21Association Areas of the Cortex
10.2K
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,...
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,...
10.2K
01:24Vision
48.6K
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.
48.6K
01:15Depth Perception and Spatial Vision
2.7K
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.
2.7K
01:26Visual 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...
Once through the pupil, the light passes through the lens, a...
2.3K
01:14Motor and Sensory Areas of the Cortex
8.1K
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....
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....
8.1K
01:12Visual Agnosia
2.0K
Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
2.0K