Ehsani H, et al. - Researchers determined the impact of cognitive task difficulty and motor task type (walking vs an upper-extremity function [UEF]) on detecting cognitive impairment in older adults. They measured cognitive ability of 100 older adults by using the Montreal Cognitive Assessment (MoCA). They asked these subjects to perform repetitive elbow flexion under three conditions: 1) at maximum pace alone (Single-task); and 2) while counting backward by ones (Dual-task 1); and 3) threes (Dual-task 2). At normal speed, similar single- and dual-task gait were performed. Using wearable sensors, they measured three-dimensional kinematics for both motor functions. They noted that, within a UEF dual-task experiment, counting backward by threes was a pertinent and challenging enough task to identify cognitive impairment among participants. As the motor task component of the dual-task, the superiority of UEF over gait was evident. In a clinical setting, the UEF dual-task could be applied as a quick memory screen.