Figure 2. Viewing behavior prior to awareness.

(a) Examples of viewing behavior prior to object awareness on the ambiguous and unambiguous stimuli with corresponding percepts. There are significant differences between the groups with different percepts (as indicated by the KL divergence analysis), and the differences in the viewing behavior on the ambiguous and unambiguous stimuli are aligned with identical percepts (as shown by the similarity index δ). The shown fixation patterns correspond to the fifth-largest index value out of the ten examined stimulus sets. (b) The cosine values underlying the similarity index calculation for the individual fixation density maps (FDM). Filled symbols represent percept A, the empty ones percept B. Squares denote cosines calculated from the unambiguous FDMs; diamonds indicate values calculated from the ambiguous FDMs. Image 1 corresponds to the example shown in (a). (c) The time-analysis showing the index-peak at about 1330 ms before the button press. Error bars are s.e.m. The shaded area marks the time during which data would be discarded according to the pupil analysis.