CORTICAL REPRESENTATION OF THE VISUAL IMAGE

我们这项研究的目的是揭示皮层神经元在 在处理自然视觉环境中的时间成分中发挥作用。 我们将研究V1神经元和追踪眼球运动的背景如何 调节时间响应，因为时间变化是 固有的正常视力，和视觉感知的目标， 自然视觉环境始终处于上下文中。 1. 我们将 描述不同类型V1神经元的时间特性 对于由闪烁、运动、颜色或纹理定义的刺激模式， 询问什么因素调节时间调谐功能。 神经元将 按层状位置分类并按功能分类。 我们将研究亮度和颜色对比度对时间的影响， 调谐曲线以检查刺激对比度对对比度的影响 增益 我们将比较对时间响应函数的影响， 本地的、重叠的适应性刺激与远程的、上下文刺激。 在单独的实验中，我们将确定时空响应 不同类型V1神经元的功能与刺激模式 由亮度或调幅纹理定义。 2.我们的目标是 通过精确的测量视觉追踪的时空调谐， 测量人类受试者的眼球运动。 我们将衡量追求 在纹理背景上呈现追击目标时的性能， 周围都是有质感的情境刺激 这样我们就可以比较 适应对比度和远程上下文对V1神经元的影响， 视觉性能 最后，我们将研究 追求眼球运动的扰动速度，刺激类或 对比度来确定线索不变性的程度。 这项工作将从根本上测试初级视觉皮层的新观点， 通过确定精细到什么程度的V1 图像处理对行为结果有影响。 意义 这项工作是它的贡献，以了解之间的关系， 皮层信息处理和感觉运动整合。

Our objective in this research is to uncover what role cortical neurons play in processing temporal components in a natural visual environment. We will study for V1 neurons and for pursuit eye movements how context modulates the temporal responsiveness, because temporal changes are inherent in normal vision, and visual perception of targets in the natural visual environment is always in context . 1. We will characterize the temporal properties of different classes of V1 neuron for stimulus patterns defined by flicker, motion, color or texture and ask what factors modulate the temporal tuning functions. Neurons will be classified by laminar location and grouped into functional classes. We will study the effect of luminance and color contrast on temporal tuning curves to examine the effects of stimulus contrast on contrast gain. We will compare the effects on temporal response functions of local, overlapping adaptive stimuli with remote, contextual stimuli. In separate experiments we will determine the spatio-temporal response functions of different classes of V1 neurons with stimulus patterns defined by luminance or amplitude modulated texture. 2. We aim to measure the spatio-temporal tuning of visual pursuit by accurate measurement of eye movements in human subjects. We will measure pursuit performance while presenting pursuit targets on textured backgrounds or surrounded by textured contextual stimuli. In this way we can compare the effects of adapting contrast and remote context on V1 neurons and oculomotor performance. Finally, we will study the sensitivity of pursuit eye movements to perturbations in speed, stimulus class or contrast to determine the degree of cue invariance for pursuit. This work will test fundamentally new views of primary visual cortex as an image processing area by determining to what extent elaborate V1 image processing has an effect on behavioral outcome. The significance of this work is its contribution to understanding the relation between cortical information processing and sensorimotor integration.