Why do brain implant trials enrol only people with severe paralysis? · Grey Matter

Research ethics weighs risk against possible benefit, and brain surgery to place an experimental device carries real risks of bleeding, infection and seizures.

Why do brain implant trials enrol only people with severe paralysis?

Research ethics weighs risk against possible benefit, and brain surgery to place an experimental device carries real risks of bleeding, infection and seizures. Those risks can be justified only for people who stand to gain most and have the fewest alternatives, such as people with tetraplegia, ALS or locked-in conditions, which is why early feasibility studies like Neuralink's enrol them. The same choice makes consent delicate, since participants may have strong hopes and limited ways to communicate, and reviews of these trials ask that consent cover what happens to the device after the study.