NEURAL COMPUTATIONS IN VISUAL CORTEX

猕猴V1区对视觉形式的皮质处理将是 研究以了解信息在丘脑输出中是如何表示的 在皮质处理的初始阶段被重新组织。 等偶极纹理和相关的新视觉刺激将被用于 分离皮质内特征提取，并分离这一过程 来自空间过滤。神经反应将通过现场监测 潜力、多单位活动和单单位活动。神经 Actilty将以一种不仅检测到更改的方式进行分析 在平均射速锁相的刺激下，也更加微妙 与刺激相关的变化，例如相关性结构的变化。 第一个子项目是表格分布的分析 VI中的处理，特别强调它与 柱状组织、层状组织和细胞色素氧化酶 斑点。第二个子项目是对皮质的详细分析 与表单处理相关的计算。作为一个起点，这 调查将围绕从 人类诱发电位和心理物理研究，其中输出 的局部非线性子单元以协作的方式组合。这 模型将在单细胞反应的基础上进行改进或修改。 在这个模型框架内，空间、时间、 并且将确定亚基的显色性质。 视觉信息处理被认为是一种感官模型 一般的信息处理。对形式加工的分析， 以及它与颜色和运动处理的关系，使我们能够 研究背景下的特征提取和跨通道交互 哪些具体的假设可以提出，哪些模型可以进行检验。

The cortical processing of visual form in area V1 of the macaque will be investigated to learn how information represented in the thalamic output is re-organized during the initial stages of cortical processing. Isodipole textures and related novel visual stimuli will be exploited to isolate intracortical feature extraction, and to separate this process from spatial filtering. Neural responses will be monitored via field potentials, multi-unit activity, and single-unit activity. Neural activlty will be analyzed in a manner which will detect not only changes in mean firing rate phase-locked to the stimulus, but also more subtle stimulus-linked changes, such as alterations in correlation structure. The first subproject is an analysis of the distribution of form processing in VI, with particular emphasis on its relationship to the columnar organization, laminar organization, and cytochrome oxidase blobs. The second subproject is a detailed analysis of cortical computations related to form processing. As a starting point, this investigation will be organized around a working model developed from human evoked-potential and psychophysical studies, in which the outputs of local nonlinear subunits are combined in a cooperative fashion. This model will be refined or revised on the basis of single-cell responses. Within this model framework, the relationship of the spatial, temporal, and chromatic properties of the subunits will be determined. Visual information processing is considered to be a model for sensory information processing in general. Analysis of the processlng of form, and its relationship to the processing of color and motion, allows us to study feature extraction and cross-modality interactions in a context in which specific hypotheses may be proposed and models may be tested.