在灵长类动物的侧面内皮层中形状选择性.
1Division of Neuroscience, Baylor College of Medicine, Houston, Texas 77030, USA. sereno@cmbn.rutgers.edu
Nature
|October 17, 1998
概括
后壁皮质中的神经元,是"何处"视觉通路的一部分,表现出形状选择性. 这表明"何处"路径也处理物体特征,独立于运动.
科学领域:
- 神经科学是一个神经科学.
- 视觉感知 视觉感知 视觉感知
- 认知神经科学 认知神经科学
背景情况:
- 外层视觉皮层在功能上分为时间 ("什么") 和顶部 ("哪里") 区域.
- 神经心理学研究支持这种功能分离.
- 正在研究前额叶皮质在整合"什么"和"在哪里"信息中的作用.
研究的目的:
- 为了研究后额叶皮层 ("何处"通路) 中的形状选择性.
- 要确定"何处"路径是否有助于处理对象特征,而不依赖于运动动作.
主要方法:
- 在固定任务期间,记录了灵长类动物后壁皮质中的神经元活动.
- 利用延迟匹配样本模式来评估神经元对塑造刺激的反应.
- 分析了与样本形状相关的形状选择性和延迟周期差异的神经元单元活动.
主要成果:
- 后壁皮层中的许多神经元表现出对二维几何形状的感觉形状选择性.
- 神经元单元在延迟期活动中显示出显著的差异,取决于样本形状.
- 后壁皮层皮层的形状选择性与腹部 ("什么") 途径中观察到的形状选择性相似.
结论:
- 后壁皮层 ("何处"通路) 中的神经元有助于注意和记住形状特征.
- 这种形状处理独立于眼睛运动,伸手或对象操纵而发生.
- 通过在空间"何处"路径中展示特征处理,这些发现挑战了严格的功能分离.
相关概念视频
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.


