system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If the brain signals for moving your hand and thinking of moving your hand are the same, what is the physiological difference that causes your hand to actually move?

Edit: In a Tom Scott video, he was describing an experiment on a zero-g flight by some neuro researchers testing their CBIs in zero-gravity. One of the researchers said the brain signal for moving your hand and thinking of moving your hand is the same hence my question.
gpt
The main reason thinking about moving does not move your arm is the 'strength of the signal'. Ie that you just *thought* about it is not enough for movement. The signals (electrical messages) your brain have to reach a particular threshold for actual movement.

What is really cool is that there is growing research into computer technology that can help with this eg for people with spinal cord injuries. They can move robotic prosthetics by just *thinking* about moving them.