Figure 8.

Tileability and conjunction search. Shown are 1-D bars, and the result of filtering those bars with fine scale (left) and coarse scale (right) bandpass filters (e.g., with a Gaussian second derivative). The fine-scale filter responses to a distractor light bar can be tiled to form a target dark bar. However, the same is not the case for the coarse-scale filter responses to a light bar. This suggests that thinner bars may lead to fewer illusory conjunctions.