I'm not sure it's the slowest. In fact according to this chart it could potentially be one of the fastest: https://www.wired.com/2016/01/phil-kennedy-mind-contr

I'm not sure it's the slowest. In fact according to this chart it could potentially be one of the fastest: https://www.wired.com/2016/01/phil-kennedy-mind-control-computer/amp https://www.wired.com/2016/01/phil-kennedy-mind-control-comp... (Seems i can't link the actual image but in the article there's a chart that breaks down the speed/information density of different types of communication.)