Fischer. Swaying head Reykjavik 2005 (press conference). Causes?

It´s strange to explain the reason why Fischer swings his head at 12:23 and 12:33 of the video.

It would be very logical that the cause was a feeling of disagreement over the discussion with Jeremy Schaap (after J.S. leaving the press conference).

I suspect that it could be a slight variant of autism.
I don´t see it as an emotional reaction, but rather as a feature of his prodigious brain.

www.youtube.com/watch?v=S2CPl6GbXrM

Great video.

Nothing new. Brilliant at chess but batshit insane.

SLagging off the dead, impressive!

I think the head swing is brought on by strong words -- nothing medical. I would guess that this type of body language just means that he's ready to back his words.

Looks like he was about to respond viciously, but decided to hold back.
In any case, Fischer was definitely a very smart man. Not sure why many people like to call him crazy.
Do your homework.