The correct answer to this open question is "spinal cord injuries."
The ability to tap into signals from the brain to produce hand and arm movement hold promise for patients with spinal cord injuries."
When a person gets a spinal cord injury, he(she is not able to move some limbs. It could be temporary or permanent. Spinal cord injuries produce a total loss of sensation or the function of muscles. It all depends on the severity of the injure. Injured people have to take treatment and rehabilitation to improve their conditions. That is why the ability to tap into signals from the brain to produce hand and arm movement holds promise for patients with spinal cord injuries."