(3/n) We found a clear asymmetry in this transition, with the engagement starting much earlier than the engagement. This leads to a brief moment where both speakers are encoded in the human cortex.

(2/n) The intuition is quite simple. When switching from a speaker A to a speaker B, the cortical tracking of A and B should decrease (disengagement) and increase (engagement) respectively. That's one key principle that BCIs for auditory attention decoding have been using