Centre-of-Gravity Fixations in Visual Search: When Looking at Nothing Helps to Find Something
Figure 1
Example of the search displays used in Experiments 1 and 2. The grid (a) shows how the search display was partitioned for data analysis and was not visible in the experiment. In Experiment 1 (a), each cluster was partitioned into 4 stimulus regions (Landolt Cs), a central void region (marked by vertical lines), and 4 peripheral void regions (marked by horizontal lines). In Experiment 2 (b), a regular grid of same-sized squares was laid over the search display that contained 18 stimuli that were randomly distributed on 36 possible positions, resulting in equal numbers of stimulus regions and void regions.
