Fang Fang’s group used the double-rectangle cuing paradigm (J Exp Psychol Gen 123: 161–177, 1994) and the low-contrast rectangles which are presented very brieﬂy to render them invisible to subjects. - IDG/McGovern Institute for Brain Research at PKU

Fang Fang’s group used the double-rectangle cuing paradigm (J Exp Psychol Gen 123: 161–177, 1994) and the low-contrast rectangles which are presented very brieﬂy to render them invisible to subjects. They found that object-based attention can be guided by an invisible object in an automatic way, with a minimal influence from high-level top-down control.

Zhang X., and Fang F. (2012). Object-based attention guided by aninvisible object. Exp B rain Res 223: 397-404.