McGill Vision Research, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada H3G 1A4
McGill Vision Research, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada H3G 1A4.
Proc Biol Sci. 2017 Nov 29;284(1867). doi: 10.1098/rspb.2017.1669.
Temporarily depriving one eye of its input, in whole or in part, results in a transient shift in eye dominance in human adults, with the patched eye becoming stronger and the unpatched eye weaker. However, little is known about the role of colour contrast in these behavioural changes. Here, we first show that the changes in eye dominance and contrast sensitivity induced by monocular eye patching affect colour and achromatic contrast sensitivity equally. We next use dichoptic movies, customized and filtered to stimulate the two eyes differentially. We show that a strong imbalance in achromatic contrast between the eyes, with no colour content, also produces similar, unselective shifts in eye dominance for both colour and achromatic contrast sensitivity. Interestingly, if this achromatic imbalance is paired with similar colour contrast in both eyes, the shift in eye dominance is selective, affecting achromatic but not chromatic contrast sensitivity and revealing a dissociation in eye dominance for colour and achromatic image content. On the other hand, a strong imbalance in chromatic contrast between the eyes, with no achromatic content, produces small, unselective changes in eye dominance, but if paired with similar achromatic contrast in both eyes, no changes occur. We conclude that perceptual changes in eye dominance are strongly driven by interocular imbalances in achromatic contrast, with colour contrast having a significant counter balancing effect. In the short term, eyes can have different dominances for achromatic and chromatic contrast, suggesting separate pathways at the site of these neuroplastic changes.
暂时剥夺一只眼睛的全部或部分输入会导致人类成年人的眼优势发生短暂转移，被遮盖的眼睛变得更强，未被遮盖的眼睛变得更弱。然而，对于颜色对比在这些行为变化中的作用知之甚少。在这里，我们首先表明，单眼遮盖引起的眼优势和对比敏感度的变化同样影响颜色和非颜色对比敏感度。接下来，我们使用双色电影，定制和过滤以不同的方式刺激两只眼睛。我们表明，眼睛之间强烈的非颜色对比不平衡，没有颜色内容，也会对颜色和非颜色对比敏感度产生类似的、无选择性的眼优势转移。有趣的是，如果这种非颜色不平衡与双眼相似的颜色对比配对，眼优势的转移是选择性的，影响非颜色但不影响颜色对比敏感度，并揭示了颜色和非颜色图像内容的眼优势分离。另一方面，眼睛之间强烈的颜色对比不平衡，没有非颜色内容，会导致眼优势的微小、无选择性变化，但如果双眼的非颜色对比相似，则不会发生变化。我们得出的结论是，眼优势的感知变化主要由非颜色对比的双眼不平衡驱动，颜色对比具有显著的平衡作用。在短期内，眼睛对非颜色和颜色对比可能具有不同的优势，这表明在这些神经可塑性变化的部位存在单独的途径。
