CORTICAL REPRESENTATION OF THE VISUAL IMAGE

视觉图像的皮质表征

• 批准号: 2415006
• 负责人: MICHAEL J HAWKEN
• 金额: $ 18.35万
• 依托单位: NEW YORK UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-01 至 1998-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2415006
• 关键词: Macaca; behavioral /social science research tag; color visions; form /pattern perception; light intensity; motion perception; neural information processing; neurophysiology; psychophysics; smooth pursuit eye movement; visual cortex; visual pathways; visual perception; visual stimulus; visual threshold; Macaca; behavioral /social science research tag; color visions; form /pattern perception; light intensity; motion perception; neural information processing; neurophysiology; psychophysics; smooth pursuit eye movement; visual cortex; visual pathways; visual perception; visual stimulus; visual threshold

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.

描述（来自研究者的摘要）：我们研究的目标 是要揭开运动处理和基础的皮质途径和 评估这些途径中传达的信号如何影响运动 灵长类动物中的感知和平稳的追捕眼动。理解 将感知信号转化为积极决定的机制 行动是视觉科学的长期目标之一。最近的 我们对视觉运动处理的理解的进步表明 未在 与常规亮度运动刺激相同。但两者都导致 生动的运动印象。我们将使用综合方法来学习 （a）神经和（b）通过使用相同刺激的追求表现 两者的条件，以及使用响应绩效的度量 可以等同于神经元，感知和追求。 （1）三 运动目标类别，亮度，色彩和非风格可以是 以感知判断的性质为心理物理来区分 回应他们。我们将利用已建立的心理物理 不同运动类别的感知处理的差异 研究神经元和V1和 外视觉区域V2和V4。我们将测量阈值轮廓 在色彩空间和运动灵敏度中 刺激评估神经元性能。对于非兴奋的刺激，我们将 测量神经元检测边界取向的性能， 以及它们在信号的信号方向上的表现 边界。 （2）与神经生理实验同时，我们 将检查三类运动刺激的功效 引起追求。我们将使用Gabor贴片作为视觉目标，为 这些将使我们能够独立控制空间， 刺激的时间和色彩特性。通过采用 在时空限制的目标中，我们获得了制作的能力 追求表现与心理物理之间的直接比较 表现。 我们预计这种方法将为我们带来独特的机会 将感觉运动集成的所有三个方面融合在一起以帮助 我们对大脑重要途径的理解，并有助于发展 未来研究的概念框架。