Then I saw this video and the penny dropped: https://www.youtube.com/watch?v=Y1at7yrcFW0 Introduction to Modern Brain-Computer Interface Design - Christian A. Kothe ; Swartz Center for Computational Neuroscience, University of California San Diego
I go back to my friend, all excited, and tell him what I saw, and as I'm describing it I realizing that I'm just repeating back to him just what he told be the other day! I stopped and apologized.
I like to think I'm on the ball but sometimes things just go over your head even when you think you know what's going on.