Determinants of visual awareness following interruptions during rivalry
Determinants of visual awareness following interruptions during rivalry
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DOI：
10.1167/4.3.6
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发表时间：
2004-01-01
影响因子：
1.8
通讯作者：
Clifford, CWG
中科院分区：
文献类型：
--
作者：
Pearson, J;Clifford, CWG
人类视觉系统无法融合两只眼睛相应区域的不同模式，导致两种模式之间感知优势的随机交替：竞争。当间歇性地出现竞争性刺激时，他们的感知就会稳定（Leopold、Wilke、Maier 和 Logothetis，2002）。这种稳定性表明某种知觉记忆在刺激中断时的运作。在这里，我们检查了这种感知记忆的内容，以量化不同信息源的相对贡献：原点、方向和颜色。刺激是间歇性地呈现的，并且在每次空白中断期间，我们交换光栅的颜色、方向或呈现的眼睛。比较每次中断之前和之后报告的感知使我们能够确定感知的哪些方面保持稳定。在传统的双眼竞争过程中，接受刺激的眼睛在 74% 的中断中保持稳定。刺激颜色和方向也有较弱的显着影响。当通过在两只眼睛之间快速交替模式来消除原眼信息时，刺激颜色在 86% 的中断中保持稳定。刺激方向再次产生较弱但显着的影响。这些结果表明，在竞争中断期间介导知觉稳定性的机制可以在单眼和双眼水平上发挥作用，就像在连续观看竞争刺激期间发挥作用的机制一样。基于这种相似性，我们推测竞争中断期间的知觉记忆可能涉及与竞争期间视觉竞争相同的神经表征。如果是这样的话，在竞争中使用间歇性刺激可能会允许研究在连续呈现期间仍然隐藏的视觉竞争机制的各个方面。
The inability of the human visual system to fuse dissimilar patterns in corresponding regions of the two eyes results in stochastic alternation of perceptual dominance between the two patterns: rivalry. When rivalrous stimuli are presented intermittently their perception is stabilized (Leopold, Wilke, Maier, & Logothetis, 2002). This stability indicates the operation of some kind of perceptual memory across interruptions in stimulation. Here we examined the contents of this perceptual memory to quantify the relative contributions of different sources of information: eye-of-origin, orientation, and color. Stimuli were intermittently presented and, during each blank interruption, we swapped either the color, orientation, or eye of presentation of the gratings. Comparing the percepts reported before and after each interruption allowed us to establish what aspects of perception remained stable. During conventional binocular rivalry, the eye in which the stimulus was presented remained stable across 74% of interruptions. Stimulus color and orientation also had weaker significant effects. When eye-of-origin information was eliminated by alternating the patterns rapidly between the two eyes, stimulus color remained stable across 86% of interruptions. Stimulus orientation again had a weaker but significant effect. These results demonstrate that the mechanisms mediating perceptual stability across interruptions in rivalry can operate at both monocular and binocular levels, much like the mechanisms operating during continuous viewing of rivalrous stimuli. On the basis of this similarity, we speculate that perceptual memory across interruptions in rivalry may involve the same neural representations as visual competition during rivalry. If this is the case, the use of intermittent stimulation in rivalry might permit the investigation of aspects of the mechanisms underlying visual competition that remain hidden during continuous presentation.