Wang Anqi, Hu Xuhua, Wu Baoyu, Chen Lihong, Luo Wenbo
Research Center of Brain and Cognitive Neuroscience, Liaoning Normal University, Dalian, PR China; Key Laboratory of Brain and Cognitive Neuroscience, Liaoning Province, Dalian, PR China.
Research Center of Brain and Cognitive Neuroscience, Liaoning Normal University, Dalian, PR China; Key Laboratory of Brain and Cognitive Neuroscience, Liaoning Province, Dalian, PR China.
Vision Res. 2020 Dec;177:1-5. doi: 10.1016/j.visres.2020.07.016. Epub 2020 Sep 6.
The context sensitivity of visual size perception can be enhanced by prior exposure to low-spatial-frequency (LSF) relative to high-spatial-frequency information. Whether LSF priming affects low- or high-level mechanisms of contextual influence remains to be clarified. By using the Ebbinghaus illusion, which is a classic example of context-dependent size perception, we reduced the lightness contrast of surrounding inducers relative to the background and the shape similarity of the central target and surrounding inducers to diminish or eliminate low-level contour interaction and high-level size contrast, respectively. The results showed that LSF-related enhancement of context influence was unaffected by a change to the surround elements' contrast but not by a change to the shape similarity between the target and surround. The findings provide evidence that LSF priming primarily affects high-level rather than low-level mechanisms of contextual influence, possibly by weakening the suppressive function of feedback connections from higher visual regions to the early visual cortex.
相对于高空间频率信息，先前暴露于低空间频率（LSF）可增强视觉大小感知的上下文敏感性。低空间频率启动是影响上下文影响的低级还是高级机制仍有待阐明。通过使用艾宾浩斯错觉（这是上下文依赖大小感知的一个经典例子），我们降低了周围诱导物相对于背景的亮度对比度以及中心目标与周围诱导物的形状相似度，以分别减少或消除低级轮廓相互作用和高级大小对比度。结果表明，与低空间频率相关的上下文影响增强不受周围元素对比度变化的影响，但受目标与周围形状相似度变化的影响。这些发现提供了证据，表明低空间频率启动主要影响上下文影响的高级而非低级机制，可能是通过削弱从较高视觉区域到早期视觉皮层的反馈连接的抑制功能。
