The amblyopic deficit for global motion is spatial scale invariant
The amblyopic deficit for global motion is spatial scale invariant
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DOI：
10.1016/j.visres.2008.06.012
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发表时间：
2008-09-01
期刊：
影响因子：
1.8
通讯作者：
Hess, Robert F.
中科院分区：
文献类型：
--
作者：
Aaen-Stockdale, Craig;Hess, Robert F.
弱视患者在全局运动识别方面表现异常。人们试图排除仅仅基于较低视觉区域可见性丧失的解释。然而，仍然存在一种可能性，即V1处理局部运动的尺度改变可能导致纹状外皮层处理整体运动的效率降低。我们使用由空间频率带通元素组成的刺激，等同于能见度，表明在低水平加工的损伤被排除后，弱视和弱视的整体运动缺陷仍然存在。这种残差是空间尺度不变的，两眼之间的相对差与刺激速度有关。我们认为这排除了仅仅基于局部运动输入的弱视全局运动缺陷的解释。相反，我们认为，除了低水平的缺陷，弱视中宽带、纹状外、全局运动机制的运动处理也受到损害。(c) 2008 Elsevier Ltd.版权所有。
Humans with amblyopia display anomalous performance for global motion discrimination. Attempts have been made to rule out an explanation based solely on the visibility loss in lower visual areas. However, it remains a possibility that the altered scale over which local motion is processed in V1 might lead to reduced efficiency of global motion processing in extra-striate cortex. We use stimuli composed of spatial frequency bandpass elements, equated for visibility, to show that the global motion deficit in amblyopia for both fellow and amblyopic eyes is still present once impairments in low-level processing have been factored out. This residual deficit appears to be spatial scale invariant and the relative deficit between the eyes shows a dependence on stimulus speed. We believe that this rules out an explanation of the amblyopic global motion deficit based solely on local motion input. We suggest instead that, in addition to low-level deficits, motion processing in a broadband, extra-striate, global motion mechanism is impaired in amblyopia. (c) 2008 Elsevier Ltd. All rights reserved.