Department of Psychology, University of Minnesota, Twin Cities, United States.
Department of Psychology, University of Minnesota, Twin Cities, United States.
Vision Res. 2021 Jul;184:8-13. doi: 10.1016/j.visres.2021.02.006. Epub 2021 Mar 24.
The McCollough Effect is a color aftereffect produced by exposure to colored, oriented patterns. For example, following adaptation to vertical red and horizontal green stripes in alternation, vertical black and white patterns appear greenish, while horizontal black and white patterns appear reddish. The striking aspect of the McCollough Effect is that just a few minutes of adaptation can produce an aftereffect lasting days or weeks. Though this effect is easily induced, previous work has shown that stronger effects can be achieved with longer periods of adaptation. To allow especially long adaptation durations, the current work develops a novel method of induction of the McCollough Effect using live video feed, filtered by orientation, and viewed with a head-mounted display. Results showed that this "McCollough World" paradigm was as strong an inducer (per unit time) as traditional paradigms using gratings, while allowing observers to adapt comfortably for multiple hours. Two hours of McCollough World adaptation produced effects that were significantly larger than 20 min of traditional adaptation, which is close to the tolerance limits for gratings. This work provides insight into the features necessary for induction of the McCollough Effect and provides a strategy for creating especially strong and long-lasting color aftereffects.
麦考罗效应是一种由彩色、定向图案引起的颜色后效。例如，在适应交替的垂直红色和水平绿色条纹后，垂直的黑白图案会呈现出绿色，而水平的黑白图案会呈现出红色。麦考罗效应的显著特点是，只需几分钟的适应时间就可以产生持续数天或数周的后效。尽管这种效果很容易产生，但之前的研究表明，通过更长时间的适应可以获得更强的效果。为了允许更长的适应时间，目前的研究开发了一种使用实时视频馈送的新型麦考罗效应诱导方法，该方法通过方向进行过滤，并使用头戴式显示器观看。结果表明，这种“麦考罗世界”范式作为诱导剂（每单位时间）与使用光栅的传统范式一样强，同时允许观察者舒适地适应多个小时。两小时的麦考罗世界适应产生的效果明显大于 20 分钟的传统适应，这接近光栅的耐受极限。这项工作深入了解了诱导麦考罗效应所需的特征，并为创建特别强烈和持久的颜色后效提供了一种策略。
