Robot-assisted integrated cognitive-motor rehabilitation led to superior upper limb motor recovery compared to conventional cognitive rehabilitation in chronic stroke patients, while both groups showed comparable improvements in global cognition.
Key Findings
Results
Both intervention and control groups showed significant within-group improvements in global cognitive function, with no statistically significant between-group differences.
Primary outcomes were the Korean Mini-Mental State Examination (MMSE) and the Korean Montreal Cognitive Assessment (MoCA)
Both groups exhibited significant within-group improvements in MMSE and MoCA scores
No statistically significant between-group differences were found for either primary cognitive outcome
The control group received time- and dose-matched conventional paper-based cognitive rehabilitation, providing an active comparator
Results
Upper extremity motor recovery was significantly superior in the robot-assisted intervention group compared to the control group.
FMA-UE scores improved from 33.6 to 37.5 in the intervention group versus 25.7 to 25.9 in the control group
Between-group difference was statistically significant (p = 0.012)
Effect size was large (Cohen's d = 0.98)
The Fugl-Meyer Assessment of the Upper Extremity (FMA-UE) was a secondary outcome measure
Results
Observed within-group gains in CERAD cognitive subdomains did not maintain statistically significant between-group differences after multiple comparisons correction.
CERAD subdomains were assessed as secondary outcomes
Within-group gains were observed in both groups across CERAD subdomains
Between-group differences did not survive False Discovery Rate (FDR) adjustment
This suggests that apparent subdomain differences may have been attributable to multiple testing rather than true differential treatment effects
Results
The robot-assisted integrated cognitive-motor rehabilitation program using the Rebless Planar end-effector system was found to be feasible and safe in chronic stroke patients.
30 patients with chronic stroke were randomized into intervention (n = 15) or control (n = 15) groups
The intervention consisted of 30 min/session, 10 sessions over 3 weeks
The Rebless Planar system integrated goal-directed reaching with tasks involving attention, memory, and executive function
The trial was described as a single-center, randomized, assessor-blinded exploratory trial
No safety concerns were reported that would preclude use of the system in this population
Methods
The study was designed as an exploratory randomized controlled trial with assessor blinding and registration in the Korean Clinical Research Information Service.
Trial registration number: KCT0010564
Total sample size of 30 participants (15 per group)
Assessor-blinded design was used to reduce measurement bias
The study was conducted at a single center
Authors acknowledge that larger trials are needed to further investigate incremental cognitive benefits of robot-assisted training over conventional therapy
What This Means
This research suggests that using a robotic system to combine physical arm movements with cognitive tasks (like memory and attention exercises) can meaningfully improve arm motor function in people who have had a stroke. In a small randomized trial of 30 chronic stroke patients, those who trained with the robot showed substantially better arm movement scores after three weeks compared to those who did traditional paper-based cognitive exercises — an improvement described as a large effect. The robot group's arm scores went from about 33.6 to 37.5 on a standard motor scale, while the comparison group's scores barely changed (25.7 to 25.9).
Interestingly, both groups improved similarly on overall measures of cognitive function (like the MMSE and MoCA tests commonly used to screen for memory and thinking problems). This means the robotic training did not appear to provide extra cognitive benefits over conventional cognitive therapy, at least as measured by these broad tests. Some differences were seen on more specific cognitive subtests, but these did not hold up after accounting for the possibility of false positive results from multiple comparisons.
This research suggests that combining physical and cognitive tasks in robot-assisted therapy may be a promising strategy specifically for improving arm and hand movement after stroke, but its added value for cognition beyond standard cognitive rehabilitation remains unclear. The study was small and exploratory, and the authors call for larger trials to confirm these findings and better understand how dual-task robotic training affects thinking and memory in stroke survivors.
Cha S, Lee J, Jeon H, Ho Chun M. (2026). Robot-assisted integrated cognitive-motor rehabilitation in patients with chronic stroke: a randomized controlled trial.. Frontiers in neurology. https://doi.org/10.3389/fneur.2026.1866135