Fig. 1.

Division of participants into analysis groups. A) Non-demented participants underwent testing and were divided into control and mild cognitive impairment (MCI) groups. The Alzheimer’s disease (AD) group was confirmed similarly. B) Quality control of analysis groups. All eye-tracking (ET) data went through quality control and recordings with < 60% success rate were disqualified. All audio recordings went through quality control, with garbled or silent recordings being disqualified before the automated King-Devick (KD) results analysis. CERAD-NB, Consortium to Establish a Registry for Alzheimer’s Disease –neuropsychological test battery; CDR, clinical dementia rating; QC, quality control. ^*One participant from the KD MCI group was removed from the KD analysis due to an excessive number of errors (> 30) made in the last KD card, as they read the test in vertical columns instead of horizontal rows.