CORTICAL REPRESENTATION OF THE VISUAL IMAGE

描述(摘自调查人员摘要)：我们研究的目标 是为了揭开运动处理和运动的皮层通路 评估在这些通路中传递的信号如何影响运动 灵长类动物的感知和顺畅追逐眼球运动。理解 将感知信号转化为积极决策的机制 动作是视觉科学的长期目标之一。近期 我们对视觉运动处理的理解的进步表明 有两类重要的视觉运动刺激不是在 与传统的亮度运动刺激相同的方式。然而，两者都导致了 生动的运动印象。我们将用综合的方法来研究 (A)神经刺激和(B)使用相同刺激的追逐表现 两种情况下的情况，并使用响应性能的测量 可以等同于神经元、感知和追求。(一)三个 运动目标的类别，亮度、彩色和非傅立叶，可以是 在心理上以所作的感性判断的性质为特点 作为对他们的回应。我们将利用已建立的心理物理学 不同类别运动的知觉加工差异 目标是研究V1和V1区神经元群体的表现 纹状外可视区域V2和V4。我们将测量阈值轮廓 在颜色空间中以及对色度和亮度的运动灵敏度 用来评估神经功能的刺激。对于非傅立叶激励，我们将 测量神经元检测边界方向的性能， 以及它们在发出移动方向信号方面的表现 边界。(2)在进行神经生理实验的同时， 将检查三类运动刺激在 诱人的追逐。我们将使用Gabor补丁作为可视目标， 这些将使我们能够独立控制空间， 刺激的时间和色度特性。通过采用使用 对于时空受限的目标，我们获得了制作 追逐成绩与心理物理成绩的直接比较 性能。 我们预计，这种方法将为我们提供独特的机会 将传感器电机集成的所有三个方面结合在一起以帮助 我们对大脑中重要通路的理解和帮助 未来调查的概念性框架。

DESCRIPTION (from the investigator's abstract): The goal of our research is to uncover the cortical pathways that underlie motion processing and to evaluate how the signals conveyed in these pathways influence motion perception and smooth pursuit eye movements in primates. Understanding the mechanisms that transform perceptual signals into positive decisions and actions is one of the long-term goals of visual science. Recent advances in our understanding of visual motion processing indicate that two important classes of visual motion stimuli are not processed in the same way as conventional luminance motion stimuli. Yet both lead to vivid impression of motion. We will use an integrated approach to study (a) neural and (b) pursuit performance by using the same stimulus conditions in both, and by using measures of response performance that can be equated across neurons, perception and pursuit. (1) The three classes of motion targets, luminance, chromatic and non-Fourier, can be distinguished psychophysically by the nature of perceptual judgments made in response to them. We will exploit established psychophysical differences in perceptual processing of the different classes of motion targets to study the performance of the populations of neurons in V1 and extrastriate visual areas V2 and V4. We will measure threshold contours in color space and motion sensitivity for chromatic and luminance stimuli to assess neuronal performance. For non-Fourier stimuli we will measure the performance of neurons for detecting boundary orientation, as well as their performance in signaling the direction of the moving boundary. (2) Concurrently with the neurophysiological experiments, we will examine the efficacy of the three classes of motion stimulus in eliciting pursuit. We will use Gabor patches as visual targets, as these will enable us to have independent control over the spatial, temporal and chromatic properties of the stimulus. By adopting the use of spatiotemporally restricted targets we obtain the ability to make a direct comparison between pursuit performance and psychophysical performance. We anticipate that this approach will give us the unique opportunity of bringing all three aspects of sensorimotor integration together to aid our understanding of important pathways in the brain and help to develop a conceptual framework for future investigations.