Does anyone know how long these sorts of electrodes are effective?
I've read that implants that help with parkinsons lose effectiveness after a couple of years due to a build up of scar tissue. Should we expect that the woman in the article has already lost the motor control the implants gave her, or are these a different sort of electrode?
A fundamental problem a lot of this work has to confront is that interpreting motor behavior is generally the best way of interpreting brain activity.
The activity that's happening in the brain but never reaches the level of motor activity (in people that are not disabled and/or impaired in some way) is problematic to interpret as it is difficult to control and may not even be properly regarded as intentional.