BINOCULAR VISION AND DEPTH PERCEPTION

双目视觉和深度感知

• 批准号: 2158574
• 负责人: JOACHIM RUDIGER VON DER HEYDT
• 金额: $ 26.31万
• 依托单位: JOHNS HOPKINS UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1979
• 资助国家: 美国
• 起止时间: 1979-06-01 至 1994-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2158574
• 关键词: Macaca mulatta; attention; binocular vision; electrophysiology; motivation; neural information processing; neuroanatomy; neurophysiology; psychophysics; sequential perception; single cell analysis; stimulus /response; visual cortex; visual depth perception; visual feedback; visual fixation; visual pathways; visual stimulus

This program of research aims at an understanding of the operational mechanisms in the cerebral cortex of primates which underlie stereoscopic depth perception. Experiments will be conducted in alert rhesus monkeys behaviorally trained to perform repeatedly a visual task, while single neuron activity will be recorded with one or more microelectrodes from striate and prestriate cortex. Stimuli will be presented stereoscopically on two color displays separately seen by the left and right eyes, and generated with a high-speed graphics system. The position of one (or both) eyes will be monitored continuously in order to control the monkey's direction of gaze. The principal objective is to obtain experimental evidence for or against the hypothesis that disparity-selective responses of cortical visual neurons are directly linked to stereoscopic depth perception, and to ascertain the significance of the different types of the neural disparity selectivity in the stereoscopic process. Three lines of investigation will be followed: First, experiments will be done to assess the responses of disparity selective neurons in visual areas V1, V2 and V3- V3A to solid figure and dynamic random-dot stereograms of different luminance contrast. Stereopsis is degraded or lost when viewing isoluminant stereopatterns: changes in the responses of stereoscopic neurons of monkey with stimuli of low luminance contrast would be a strong indication in favor of a direct role of these neurons in stereopsis. Moreover, the results of these experiments would provide information about which anatomo-physiological visual subsystem (magno- or parvo-cellular) neurons with stero properties are part. An associated series of experiments will be designed to investigate the mechanisms underlying the responses of cortical neurons to random-dot stereograms, that is of the mechanisms providing the substrate for the correct matching of corresponding elements of the images in the two eyes, a task that human subjects perform effortlessly and most accurately. Finally, I will attempt to assess the influences of attention and motivation on the neural responses of depth neurons in different cortical areas. The basic strategy of thee experiments will be to train the monkey to attend to the very stimulus that activates the cortical neuron under study, and to identify differences in the neuron's responses when that stimulus is or is not of behavioral relevance to the monkey.

该研究计划旨在了解运营 基于立体镜的大脑皮层的机制 深度感知。 实验将在警报恒河猴中进行 经过行为训练以反复执行视觉任务，而单身 神经元活性将以一个或多个微电极的记录 条纹和预先皮质。 刺激将在立体尺度上展示 在两种颜色上，左眼和右眼看到 由高速图形系统生成。 一个（或两者）的位置 将连续监视眼睛以控制猴子的 目光的方向。 主要目的是获得实验 证据或反对差异选择反应的假设 皮质视觉神经元与立体深度直接相关 感知，并确定不同类型的不同类型的意义 立体过程中的神经差异选择性。 三行 将遵循调查：首先，将进行实验以评估 视觉区域V1，V2和V3-的差异选择性神经元的反应 V3A到固体形象和不同的动态随机点立体图 亮度对比。 观看时立体声降解或丢失 隔离立体模式：立体镜面的响应变化 猴子神经元具有低亮度对比的刺激将是强烈的 指示这些神经元在立体探针中的直接作用。 此外，这些实验的结果将提供有关 哪些是分析性的视觉子系统（磁性或parvo细胞） 具有Stero属性的神经元是一部分。 一系列相关系列 实验将旨在研究研究机制 皮质神经元对随机点立体图的反应，即 提供基板的机制，以正确匹配 两只眼睛中图像的相应元素，这是人类的任务 受试者毫不费力，最准确。 最后，我会尝试 评估注意力和动力对神经的影响 深度神经元在不同皮质区域的反应。 基本策略 您的实验将是训练猴子参加 激活正在研究的皮质神经元的刺激，并确定 刺激是或不为 与猴子的行为相关。