for me personally so far it’s just been obvious bc of the instant change in perspective that’s being represented. when I go “I’m sorry I just suddenly don’t care about this topic anymore and I can’t give you any insight on it” it’s kind of easy to be like “okay, this is a different self state” from an outside perspective.

outside of that most often occurrence, it’s also easy to spot in the office bc of how my demeanor changes. I also usually play with a tuoy and the way I play with it might change as well. My therapist who is a specialist is trained to spot these changes and examine them.