DISPARITY PROCESSING IN SENSORY AND MOTOR VISUAL SYSTEM

人类视觉中立体机制的空间选择性 深度知觉的加工差异将与 控制水平差异趋同的机制。建议数 研究将调查立体视觉的持续性和暂时性成分 和凝聚力。眼球运动和心理物理实验将检查 方向性、空间频率特异性和对比极性 瞬变和持续聚光的分视刺激所需的 立体声感知。结果将被用来制定一个模型 感觉和运动系统的视差处理可应用于 辐合和立体异常以及相互作用的分析 在复杂的自然环境中持续和瞬时的收敛反应之间 视觉场景。 将引发持续和瞬时的视差趋同响应 两种范式。在持续范式中，正弦波的强度 不同的差异刺激是由它可以达到的程度来衡量的 从试图稳定凝视的受试者身上引起强烈的反应。 连续、非自愿正弦收敛跟踪的增益和相位 作为亮度对比度、空间频率 眼球间的空间频率差和方位差 立体图刺激。这种非自愿跟踪范例提供了一种 客观评估视觉系统对阈值和 阈值以上刺激，只需要受试者尝试注视 稳步前进。瞬变范式等同于被迫做出选择 步骤有两个可能的双目匹配的过程 视差刺激，一个产生交叉视差，另一个产生 不相交的差距。步长收敛的初始速度和延迟 测量反应以评估两种刺激的相对强度。 这些结果和立体声阈值的可比测量结果将是 用于评估双眼感觉和运动的空间选择性 函数，并确定视差信息的公共来源是否 利用这些双目传感器和运动功能。

Spatial selectivity of stereoscopic mechanisms in human vision that process disparity for the perception of depth will be compared to that of mechanisms that control horizontal disparity vergence. The proposed studies will investigate sustained and transient components of stereopsis and vergence. Oculomotor and psychophysical experiments will examine the orientation and spatial frequency specificity and contrast polarity required for dichoptic stimuli of transient and sustained vergence and stereo perception. The results will be used to formulate a model of disparity processing for sensory and motor systems that may be applied to the analysis of vergence and stereo anomalies as well as to interactions between sustained and transient vergence responses within complex natural visual scenes. Sustained and transient disparity vergence responses will be elicited with two paradigms. In the sustained paradigm, strength of a sinusoidally varying disparity stimulus is measured by the extent to which it can elicit a vergence response from a subject attempting to fixate steadily. The gain and phase of continuous, involuntary sinusoidal vergence tracking is measured as a function of the luminance contrast, spatial frequency, interocular spatial frequency difference and orientation difference of the stereogram stimuli. This involuntary tracking paradigm provides an objective assessment of visual system responses to threshold and suprathreshold stimuli, requiring only that the subject attempt to fixate steadily. The transient paradigm is equivalent to a forced choice procedure in which there are two possible binocular matches of the step disparity stimuli, one that produces a crossed disparity and the other an uncrossed disparity. The initial velocity and latency of step vergence responses is measured to assess the relative strength of the two stimuli. These results and those of comparable measures of stereo threshold will be used to assess the spatial selectivity of binocular sensory and motor functions and to determine if a common source of disparity information is utilized b these binocular sensor and motor function.