Skip to main content
. Author manuscript; available in PMC: 2006 Apr 22.
Published in final edited form as: Nat Neurosci. 2005 Jul 10;8(8):1110–1116. doi: 10.1038/nn1501

Figure 5.

Figure 5.

Effects of pop-out and directed attention on suppressive interactions in human visual cortex. SSIs obtained for areas V1 (squares), V2/VP (triangles), and V4 (circles) are plotted for the current study, probing bottom-up effects of pop-out on suppressive interactions, (filled symbols) and for a study that probed the top-down effects of directed attention on suppressive interactions7 (open symbols). The horizontal axis represents the SSIs obtained for heterogeneous display conditions from the two studies, when the peripheral stimuli were unattended. The vertical axis represents the SSIs obtained for the pop-out display condition from the present study and the directed attention condition from the previous study7 to directly compare the top-down and bottom-up effects on suppressive interactions. The dashed line represents the points at which the two indices are equal, indicating no modulation of suppressive interactions by top-down or bottom-up influences.