Treatment of artifacts and outlying samples

Data were filtered, or partially removed, on a test-by-test basis by manual adjustment of VEST™ software controls according to standard operating guidelines/procedures for the removal of artifacts (e.g., blinks, recording noise, temporary failures of eye-tracking, shifting of goggles, erroneous responses or those unrelated to the task) to separate eye movement signals from other recording noise, or to segregate saccadic activity from pursuit activity. Individual tests for some participants were removed from analysis when the data quality was judged to be inadequate for accurate measurement or produced analytic errors, or test was not run.