CORTICAL REPRESENTATION OF THE VISUAL IMAGE

我们在这项研究中的目标是揭示大脑皮层神经元 在自然视觉环境中处理时间成分方面发挥作用。 我们将研究V1神经元和追踪眼球运动的上下文 调节时间响应性，因为时间变化 正常视觉所固有的，以及对目标的视觉感知 自然的视觉环境总是在文脉中。1.我们会 表征不同类型V1神经元的时间特性 对于由闪烁、运动、颜色或纹理和 询问是什么因素调节了时间调谐功能。神经元将会 按层流位置分类，并分成功能类。 我们将研究亮度和颜色对比度对时间的影响 调整曲线以检查刺激对比度对对比度的影响 收获。我们将比较它们对时间响应函数的影响 局部的、重叠的适应性刺激和远程的、背景的刺激。 在单独的实验中，我们将确定时空响应 不同类型V1神经元的刺激模式功能 由亮度或幅度调制纹理定义。2.我们的目标是 用精确度测量视觉追踪的时空调节 测量受试者的眼球运动。我们将测量追击 在纹理背景上呈现追捕目标时的性能或 被有质感的上下文刺激所包围。这样我们就可以比较 适应对比度和远距离背景对V1神经元的影响 眼球运动表现。最后，我们将研究其敏感性。 追踪眼球运动对速度、刺激等级或 对比判断追逐线索的不变性程度。 这项工作将从根本上测试初级视觉皮质的新观点 通过确定将V1细化到什么程度来确定图像处理区域 图像处理对行为结果有影响。它的意义 这项工作的重要意义在于它有助于理解 大脑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.