在的初级视觉皮层中定位调整的动力学
D L Ringach1, M J Hawken, R Shapley
1Center for Neural Science, New York University, New York, New York 10003, USA. dario@cns.nyu.edu
Nature
|May 15, 1997
概括
视觉皮层 (V1) 中的定向调是动态发展的. 输入层神经元显示稳定的调,而输出层神经元显示时间变化的偏好,表明皮质内反形状V1处理.
科学领域:
- 神经科学是一个神经科学.
- 视觉皮层研究 视觉皮层研究
- 计算神经科学是一种神经科学.
背景情况:
- 定向调是主要视觉皮层 (V1) 中神经元的一个关键特征.
- 对V1的thalamic输入缺乏方向选择性,使V1调的出现成为一个关键问题.
- 现有的模型很难完全解释V1.1中方向调节的复杂动态.
研究的目的:
- 为了研究V1神经元中方向调节的时间动态.
- 为了区分V1.1的输入和输出层之间的调特性.
- 探索网络架构 (feedforward与反) 在塑造V1响应中的作用.
主要方法:
- 在导向域中利用反向相关性来测量不断演变的神经调.
- 分析了随着时间的推移 (30-85 ms后刺激) 的方向调发展.
- 在不同的V1层中比较调特性,区分输入 (4Cα,4Cβ) 和输出层 (2,3,4B,5,6).
主要成果:
- 定向调以30-45毫秒的延迟出现,持续40-85毫秒.
- 输入层神经元 (4Cα,4Cβ) 显示稳定,单一的方向偏好.
- 输出层神经元显示时间变化的首选方向,有时具有多个峰值,和比输入层更清晰的调.
结论:
- V1神经元不是静态的过器;它们的动态调反映了复杂的处理.
- 输出层神经元所观察到的特性可以通过反网络模型更好地解释,而不是简单的前模型.
- 皮层内反机制在塑造 V1.1 中方向调节的时间动态方面发挥着至关重要的作用.
相关概念视频
Vision
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.
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.
Anatomy of the Eyeball
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 layer, the vascular tunic,...


