VISUAL ATTENTIVE PROCESSES

这项研究的目的是调查 视觉注意集中在感觉过程的几个阶段 灵长类动物的皮质视觉系统。研究计划 就是比较身体活动引起的神经活动 不同注意条件下呈现的相同测试刺激 神经生理和心理物理相结合的情况 调查。主要目标是确定是否 注意机制对神经施加动态控制 视觉事件在初始视觉皮质中的表现 区域。 电生理和行为学联合检查 会对焦点注意力的影响产生影响 关于定向线段的视觉信息的处理 在皮质视觉加工的三个早期阶段(V1，V2， 和V3/V3A)。将使用两种方法。第一个是 比较不同脑区神经元的反应特性 视觉皮层区域在以下条件下的轨迹： 焦点注意力受到控制，并被定向到 目标刺激或远离目标刺激。第二 方法是比较响应属性和配置文件 在需要重点关注的情况下 确定目标刺激，相比之下，在这些刺激下 物理上错综复杂的目标刺激 可以在没有焦点关注的情况下被识别出来。目标是 确定注意力对早期大脑皮层的影响 视觉传入输入的处理，以确定 这些变化，以确定皮质链中的什么位置 处理发生的更改，并确定它们发生的时间 在相对于刺激事件的时间上。

The aim of the research is to investigate the influence of focal visual attention upon sensory processes at several stages of the cortical visual system in primates. The research plan is to compare the neural activity evoked by physically identical test stimuli presented under different attentional conditions in combined neurophysiological and psychophysical investigations. The major objective is to determine whether attentional mechanisms exert dynamic control over the neural representation of visual events in the initial visual cortical areas. Combined electrophysiological and behavioral investigations will be made of the influence of focal attention of the processing of visual information about oriented line segments in three early stages of cortical visual procesisng (V1, V2, and V3/V3A). Two approaches will be used. The first is to compare the response properties of neurons in the respective visual cortical areas under conditions in which the locus of focal attention is controlled and is directed either at the target stimulus or away from the target stimulus. The second approach is to compare the response properties and profiles under conditions in which focal attention is required to identify the target stimulus and, by contrast, under those conditions in which the physically indentical target stimulus can be identified without focal attention. The objectives are to determine the influence of attention upon the early cortical processing of visual afferent input, to determine the nature of the changes, to determine where in the chain of cortical processing the changes occur, and to determine when they occur in time relative to the stimulus event.