Orientation-tuned suppression in binocular rivalry reveals general and specific components of rivalry suppression
Orientation-tuned suppression in binocular rivalry reveals general and specific components of rivalry suppression
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DOI：
10.1167/9.11.17
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发表时间：
2009-01-01
影响因子：
1.8
通讯作者：
Alais, David
中科院分区：
文献类型：
--
作者：
Stuit, Sjoerd M.;Cass, John;Alais, David
在双眼竞争（BR），冲突的单眼图像交替抑制意识。在图像抑制期间，探头的对比灵敏度相对于图像处于感知优势时降低了类似于0.3-0.5个对数单位。以往的研究竞争抑制导致争议的性质和程度的抑制在BR。我们测试了特定功能的抑制，使用正交竞争光栅和测量对比敏感度的小光栅探头在一个2AFC方向辨别任务的方向范围。结果表明，抑制是不均匀的跨方向：抑制是更大的方向接近的抑制光栅。更高的抑制是特定于被抑制的竞争光栅周围的窄范围，具有类似于V1取向带宽的调谐。一个类似的实验测试了空间频率调谐，发现对于接近被抑制光栅的频率的频率，抑制更强。有趣的是，没有调谐抑制观察时，闪烁和交换的范例，表明调谐抑制只发生在较低水平，眼间竞争。总之，结果表明，有两个组件竞争抑制：一个一般的功能不变的组件和一个额外的组件，专门调整到竞争的功能。
During binocular rivalry (BR), conflicting monocular images are alternately suppressed from awareness. During suppression of an image, contrast sensitivity for probes is reduced by similar to 0.3-0.5 log units relative to when the image is in perceptual dominance. Previous studies on rivalry suppression have led to controversies concerning the nature and extent of suppression during BR. We tested for feature-specific suppression using orthogonal rivaling gratings and measuring contrast sensitivity to small grating probes at a range of orientations in a 2AFC orientation discrimination task. Results indicate that suppression is not uniform across orientations: suppression was much greater for orientations close to that of the suppressed grating. The higher suppression was specific to a narrow range around the suppressed rival grating, with a tuning similar to V1 orientation bandwidths. A similar experiment tested for spatial frequency tuning and found that suppression was stronger for frequencies close to that of the suppressed grating. Interestingly, no tuned suppression was observed when a flicker-and-swap paradigm was used, suggesting that tuned suppression occurs only for lower-level, interocular rivalry. Together, the results suggest there are two components to rivalry suppression: a general feature-invariant component and an additional component specifically tuned to the rivaling features.