A feasibility pilot study comparing tablets and smartphones for an app-based speed training program in older people: an open-label, randomized controlled PROBE trial.

This feasibility pilot study examined whether the device type (tablet or smartphone) influences the effectiveness of a brain training program for older adults. Forty-four community-dwelling participants were randomly assigned to the tablet or smartphone group using a stratified block randomisation protocol based on age and sex. Each participant completed 12 supervised training sessions, each lasting approximately 40 min, over 3 to 4 months. Cognitive assessments included general intelligence, attention, memory, and executive function. Two-way repeated-measures analysis of variance (ANOVA) was used to test the effects of the device type and time (pre- vs. post-intervention). Of the 44 participants, 36 completed the program. No main or interaction effects were observed for device type. However, significant improvements over time were found in the Montreal Cognitive Assessment, Raven's Coloured Progressive Matrices, Paced Auditory Serial Addition Test, Frontal Assessment Battery, time required to complete Raven's Coloured Progressive Matrices, visual cancellation, and Trail-Making Test Part A. These results suggest comparable near-transfer benefits in attention and executive functions across tablets and smartphones. However, neither device produced far-transfer gains in memory measures. These findings underscore the feasibility and potential cost-effectiveness of smartphone-based training interventions for supporting cognitive health in later life.Trial Registration: Registered in the University Hospital Medical Information Network Clinical Trials Registry on October 15, 2020 (UMIN000042123).