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首页> 外文期刊>Neuropsychologia >The effect of central (macula) sparing on contralateral line bisection bias: a study with virtual hemianopia.
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The effect of central (macula) sparing on contralateral line bisection bias: a study with virtual hemianopia.

机译：中央（黄斑）保留对侧线二等分偏斜的影响：虚拟偏盲的研究。

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摘要

Hemianopic patients show a contralesional bisection bias, but it is unclear whether this is a consequence of their field loss or related to extrastriate damage. One observation cited against the former is that hemianopic bisection bias does not vary with the degree of central (macular) sparing; however, it is unclear to what extent central sparing should affect this bias. Our goal was to determine the effect of central sparing on line bisection biases from field loss alone, with two approaches. First, we studied 12 healthy subjects viewing lines under conditions of virtual hemianopia, created by a gaze-contingent technique. Second, we calculated the effect predicted by a visuospatial model of the effect of central magnification on line representations in the visual system. Our results first replicated the contralateral line bisection bias with hemianopia, confirming that this can be generated by visual hemifield loss in the absence of extrastriate damage. Central sparing had only a modest effect on hemianopic bisection bias, with only slightly less bias with 10 degrees compared to 2 degrees of central sparing. In accordance with these empiric data, computing the center of mass for line representations in our model showed only a shallow decline in bisection bias as central sparing increased from 0 to 10 degrees . We conclude that contralateral bisection bias only decreases slightly with central sparing, and that the absence of a statistically significant effect of central sparing in patients cannot be taken as evidence against a visual origin of contralateral hemianopic line bisection bias.
机译：偏盲患者表现出对侧平分偏斜，但是目前尚不清楚这是由于他们的田野损失所致还是与外泌体损害有关。反对前者的一项观察结果是，半盲状二等分偏差不随中央（黄斑）保留的程度而变化。但是，尚不清楚中央节约在多大程度上应影响这一偏见。我们的目标是使用两种方法来确定仅从场损失中获得中心备用对线路二等分偏差的影响。首先，我们研究了由凝视视线技术创建的虚拟偏盲条件下的12位健康受试者的视线。其次，我们计算了视觉放大模型对视觉系统中线放大率的影响的视觉空间模型所预测的效果。我们的研究结果首先用对侧偏视复制了对侧线对分偏视，证实了这种现象可能是由于在没有过度损伤的情况下视力半视野丧失而引起的。中央备用对半钢琴分割的偏见仅有中等程度的影响，只有10度的偏向与中央备用的2度相比仅稍少。根据这些经验数据，在我们的模型中计算线表示的质心表明，随着中心距从0度增加到10度，二等分偏差只有很小的下降。我们得出的结论是，对侧二等分偏倚仅随着中央保留而略有减少，并且不能将患者中没有中央统计学上的统计学显着效果作为对侧半盲线对等偏视的视觉起源的证据。

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