First-in-human case study of BCI-spinal stimulation shows hand function gains in chronic tetraplegia

This first-in-human case study involved one individual with chronic, motor-complete cervical spinal cord injury. The intervention was an implantable brain-computer interface (BCI) that decoded motor intent from electrocorticography signals to trigger cervical epidural spinal cord stimulation (ESCS) at intent onset, compared to tonic ESCS alone. Follow-up was conducted one month after a four-week therapy period.

The study reported that the BCI-ESCS paradigm enhanced grip strength and object manipulation immediately, though no specific effect sizes or absolute numbers were provided. Corticospinal excitability showed greater increases after a single session. After the four-week therapy, the individual demonstrated clinically meaningful improvements in voluntary hand function, even without system assistance, with some of these gains persisting at the one-month follow-up.

Safety and tolerability data were not reported. Key limitations include the single-subject design, absence of statistical measures or effect sizes, and lack of a controlled comparison. The findings represent a proof-of-concept suggesting intention-driven neuromodulation may induce corticospinal plasticity.

For clinical practice, these findings are preliminary and mechanistic. They suggest a novel, potentially plasticity-inducing approach for neuromotor recovery in chronic spinal cord injury, but the evidence is from a single case without quantitative safety or efficacy data. Controlled trials are needed to assess generalizability, magnitude of benefit, and risks.