A Mystery

I have this frequent habit of doing two activities simultaneously, one is particularly, in this case, of talking and listening; and the other can be writing symbols, or drawing lines, doodling figures or patterns either carving them on house-hold artices or any viable medium. The interesting thing is that my brain starts relating these two activities, obviously of different domains, while no dualism appears anymore. It is like as if heard or spoken word(s) is being carved into the structural patterns that my brain is recording, meanwhile, through the vision of the eyes and hearing of the ears. During some intense moments, this may result in discontinuity in awareness of the discussion with the other person. And I become so much absorbed in these two activitis that I have no idea what is happening in my surrounding, and also, not knowing, 'Who is he I'm talking to?' or even, to mention the extreme, 'Who am I?'

I do not understand this mystery. Do you?