DISPARITY PROCESSING IN SENSORY AND MOTOR VISUAL SYSTEM

人类视觉中立体机制的空间选择性， 深度感知的过程差异将与 控制水平视差聚散度的机制。拟议 研究将调查立体视觉的持续和短暂成分 和聚散度视觉和心理物理实验将检查 方向和空间频率特异性和对比极性 需要短暂和持续的聚散的双视刺激， 立体知觉结果将用于制定一个模型， 用于感觉和运动系统的视差处理 聚散度和立体异常以及相互作用的分析 在复杂的自然环境中， 视觉场景 持续和短暂的视差聚散反应将被引发， 两个范例。在持续的范例中， 变化的视差刺激是通过它可以在多大程度上 从试图稳定地注视的受试者那里引出聚散反应。 连续非自主正弦聚散度跟踪的增益和相位 作为亮度对比度，空间频率， 眼间空间频率差和方向差 立体图刺激。这种无意识的跟踪模式提供了一种 客观评估视觉系统对阈值的反应， 阈上刺激，仅需要受试者尝试注视 稳瞬态范式相当于被迫选择 其中存在步骤的两个可能的双目匹配的过程 视差刺激，一个产生交叉视差，另一个产生交叉视差。 无交叉的差异。步聚散的初速度和潜伏期 测量响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措施将是 用于评估双眼感觉和运动的空间选择性 功能，并确定视差信息的公共源是否 利用了B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.