Usability of the digit-tracking technique in a geriatric population of inpatients with and without neurocognitive disorders: The DIGICOG-start study.

Tools for the early diagnosis of neurocognitive disorders (NCD) both accessible, fast, fun and efficient are currently needed. A digit-tracking technique (Digitrack) has been developed based on the exploration of blurred images on a tablet with the finger, related to the exploration of images during eye-tracking. The present study aimed at assessing the objective usability and the subjective User eXperience (UX) of the Digitrack by older adults according to the presence and the severity of NCD. A total of 135 patients were included in a geriatric acute care unit. Objective usability was assessed through the number of patients able to complete the Digitrack's training (3 images) and evaluation (20 images) phases. UX was measured through standard questionnaires (AttrakDiff and meCUE), and through the description of engagement behaviors following an internally developed scale which included 5 levels (interactive, constructive, active, passive and disengaged behaviors). The success rate of the device was 94.1%. The Digitrack had a very good overall attractiveness, standard hedonic and pragmatic qualities, and the emotions perceived were predominantly positive. These findings were not homogeneously observed in the whole studied population. Patients highly impaired due to NCD tended to rate the device with more neutral scores and to perceive more negative emotions. The participants mainly demonstrated active behaviors, but patients with severe major NCD were mostly passive. The study showed promising results regarding the usability and acceptability of a digit-tracking technique within older adults. Further studies should evaluate the potential of this novel methods to make a cognitive diagnosis.