Just to throw in here, it's possible I have CAPD, too. I fit all of the original description. I also have poorly corrected vision problem, amblyopia. However, I think of mine as being all on or in cruise mode. When I interact with people, I am 100% engaged, I am over aware of individual nuances and social mores to the degree I am uncomfortable interacting in a group until I know the people because I am far concerned with offending than minor gains an introvert might take away from an interaction.