The brain is incredibly complicated and there is a lot of noise. More channels do make a huge difference. It’s not like each channel is associated to one direction or something and you only need 4. Also, to add to the other users point, the signal strength is much stronger inside than out since the skull acts like a barrier.
Your example is the equivalent of saying you don’t need a keyboard because you can use a computer with just the arrow keys and the spacebar.
Although BCIs are already a thing, the difference between what you can do with external compared to internal ones is probably quite vaste at our current tech level and will probably lead to better external ones at the same time.
You also don’t control the electrodes, you just receive the signal from them and they are obviously all being sampled.
The brain is incredibly complicated and there is a lot of noise. More channels do make a huge difference. It’s not like each channel is associated to one direction or something and you only need 4. Also, to add to the other users point, the signal strength is much stronger inside than out since the skull acts like a barrier.
Your example is the equivalent of saying you don’t need a keyboard because you can use a computer with just the arrow keys and the spacebar.
Although BCIs are already a thing, the difference between what you can do with external compared to internal ones is probably quite vaste at our current tech level and will probably lead to better external ones at the same time.
You also don’t control the electrodes, you just receive the signal from them and they are obviously all being sampled.