Hybrid EEG–EOG Brain–Computer Interface for Virtual-Reality Powered Mobility Training in Children with Severe Neuromotor Disabilities: A Multiple-Case Feasibility Study

Background: Developing Brain–Computer Interfaces (BCIs) for children with severe neuromotor disabilities remains challenging due to developmental neurophysiology and the high cognitive demands of motor imagery. Hybrid BCIs integrating electroencephalography (EEG) and electrooculography (EOG) can overcome these limitations by combining continuous motor-related control with reliable discrete commands. This multiple-case study investigated the feasibility of a hybrid EEG–EOG BCI integrated with a virtual reality (VR) powered wheelchair simulator for mobility training. Methods: Six participants (mean age: 13.00 ± 3.52 years; 1 female, 5 males) with severe neuromotor disabilities (i.e., Central Core Myopathy, LAMA2 related Congenital Muscular Dystrophy, Spinal Muscular Atrophy Type II, and Cerebral Palsy) completed repeated sessions using a self-paced BCI. The system combined continuous kinesthetic motor imagery (KMI) for steering and EOG-detected voluntary blinks for discrete commands. We evaluated online classification performance (accuracy, sensitivity, specificity), user workload (NASA-TLX), and simulator-related discomfort (MSAQ) under fully and semi-immersive VR conditions. Results: Across the selected session-level evaluations, mean online classification accuracy was 67%, increasing to 77% when considering only successful evaluations. Four of the six participants completed the experimental protocol, whereas two discontinued after T3 because sufficiently stable BCI control could not be achieved. NASA-TLX scores indicated increasing perceived workload but generally low frustration, while low MSAQ scores suggested good VR tolerability. No participants withdrew because of VR-related discomfort or adverse effects. Conclusions: This exploratory study provides preliminary evidence supporting the feasibility of hybrid EEG–EOG BCI control within a VR-based powered mobility simulator for children and adolescents with severe neuromotor disabilities. Although simulated navigation was feasible for four participants, substantial variability in BCI control highlights the need for further technological refinement and validation in larger cohorts.