Comment by r_lee

why are you assuming it's not simply psychological?

"gets really nervous, makes a bunch of noise, annoys his brother, like he can't be canalised if he's not focused." could be autism or ADHD.

btw, ADHD doesn't mean "attention problems", it is much more complex than that and it can manifest in many different ways.

e.g. assuming he would have it, the listening provides a baseline level of stimulation, but as soon as it stops, there must be something to provide that stimulation, thus all those things.

if there's more behavioral stuff that you can recall, that would offer more clues.