The dynamics of vertical vergence
The dynamics of vertical vergence
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DOI：
10.1007/pl00005735
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发表时间：
1997-08-01
影响因子：
2
通讯作者：
Zacher, JE
中科院分区：
文献类型：
--
作者：
Howard, IP;Allison, RS;Zacher, JE
我们测量的增益和相位的垂直聚散度响应于分离的垂直振荡的dichoptic纹理显示器。纹理元素是m尺度的，以使显示区域上的可见度相等，并且是非周期性的和形状变化的，以避免虚假的双目匹配。显示器对向65度，并在0.05至2 Hz的频率下通过18最小至4度的峰-峰振幅振荡-比以前的研究中使用的范围更大。当刺激以0.1Hz或更小的频率振荡18 μ m时，聚散度增益接近1。当刺激振荡的幅度从18 μ m增加到4 °时，聚散度增益在所有频率下都降低，这是非线性的证据。增益随刺激频率的增加而下降，但在2 Hz时仍约为0.5，振幅为18 μ m。相位滞后从0.05 Hz的刺激频率下的小于10度增加到2 Hz时的100度和145度之间。总的来说，垂直聚散的动态类似于水平聚散和旋转聚散的动态。
We measured the gain and phase of vertical vergence in response to disjunctive vertical oscillations of dichoptic textured displays. The texture elements were m-scaled to equate visibility over the area of the display and were aperiodic and varied in shape so as to avoid spurious binocular matches. The display subtended 65 degrees and oscillated through peak-to-peak amplitudes from 18 are min to 4 degrees at frequencies from 0.05 to 2 Hz - larger ranges than used in previous investigations. The gain of vergence was near 1 when the stimulus oscillated at 18 are min at a frequency of 0.1 Hz or less. As the amplitude of stimulus oscillation increased from 18 are min to 4 degrees, vergence gain decreased at all frequencies, which is evidence of a nonlinearity. Gain declined with increasing stimulus frequency but was still about 0.5 at 2 Hz for an amplitude of 18 are min. Phase lag increased from less than 10 degrees at a stimulus frequency of 0.05 Hz to between 100 degrees and 145 degrees at 2 Hz. Overall, the dynamics of vertical vergence resemble the dynamics of horizontal vergence and cyclovergence.