形状の選択性について,霊長類の側頭部内対面皮質における形状の選択性
1Division of Neuroscience, Baylor College of Medicine, Houston, Texas 77030, USA. sereno@cmbn.rutgers.edu
Nature
|October 17, 1998
まとめ
視覚経路の"どこ"の一部である後部頭皮質のニューロンは,形状の選択性を示しています. これは",どこに"経路が,動きから独立して,オブジェクトの特徴を処理することを示唆しています.
科学分野:
- 神経科学は神経科学である.
- 視覚的知覚 視覚的知覚
- 認知神経科学とは
背景:
- 外層視野皮質は,機能的には,テンポラル ("何") と表層 ("何処") 領域に分かれています.
- 神経心理学の研究は,この機能的分離を裏付けている.
- "何"と"どこで"の情報を統合する前頭前野の役割は調査中です.
研究 の 目的:
- 後部頭皮質の形状選択性を調査する ("何処"経路).
- "どこに"経路が,運動行動とは無関係にオブジェクトの特徴の処理に寄与するかどうかを判断する.
主な方法:
- 固定タスク中に霊長類の裏側頭上皮質のニューロンの活動を記録する.
- 形状刺激に対するニューロン反応を評価するために,遅延マッチ・トゥ・サンプルのパラダイムを利用した.
- サンプルの形状に関連する形状選択性と遅延期差異のためのニューロンユニット活動を分析した.
主要な成果:
- 後部頭皮質の多くのニューロンは,2Dの幾何学的な形状に対する感覚的形状選択性を示した.
- ニューロン単位は,サンプル形によって遅延期活動の有意な差異を示した.
- 後部頭皮質の形状選択性は,腹部 ("何") 経路で観察されたものと比較可能でした.
結論:
- 後部頭皮質 ("何処"経路) のニューロンは,形状特性を注意し,記憶することに貢献します.
- この形状処理は,眼の動き,伸縮,物体の操作とは無関係に起こる.
- 発見は,空間的な"どこ"経路内の特徴処理を実証することによって,厳格な機能的分離を挑戦します.
関連する概念動画
Somatosensation
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.
Motor and Sensory Areas of the Cortex
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.
Association Areas of the Cortex
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,...
Lobes of the Cerebrum
The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements.
Somatosensory, Motor, and Association Cortex
The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...
Lateralization
Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.


