Paralyzed woman uses mind to control robotic arm

The video tutorial explains the use of intercortical microelectrodes, which are small devices implanted into Jan Sherman's motor cortex. These electrodes are connected to a computer and a robotic arm. Researchers first have Sherman watch the robotic arm perform a task and then imagine herself doing the same task. The computer records her brain activity during this process. When Sherman thinks of a command, the computer translates her brain's electrical activity into instructions for the robotic arm, enabling it to perform the desired action.

How are the electrodes connected to the robotic arm?

What happens to the brain activity recorded during the exercise?