Only correctly answered trials were used for analysis. Trials with
saccades beyond the fixation-area were removed from further analysis.
A fixation area was defined as subtending 1.8° diameter visual angle
centered on the fixation cross ensuring fixation-areas did not overlap
(Fig. 1). This step in the pre-processing removed an average of 4.2% of
trials (±3.4 SD) across the 21 participants included in the final sample.