Jabberwocky
Frumious Bandersnatch
It's most likely that he is referring to the tendency for 5ht2a agonists to cause muscle tremor.
yeah, it's the shaking. I can stop it or abate if I want to but with effort. I prefer to just let myself shake till tension is gone and it feels wonderful, but it looks weird and makes people worry. So maybe "conscious seizures" has more fright value than it should but it sure can look like one if your buddy walks in on you. I can the shakes with all psychedelics to varying degrees but it is a especially common with DOC for me personally.
I also find it to be pretty much the opposite of dissociating, though at high doses I have been pretty in my head when choosing to listen to music rather than be active. I find that DOC focuses me to a very intense degree... I will get very into what I'm doing.
My dissociative of choice was MXE if that helps. I found the things you experience in that headspace can be just as intense as any psychedelic but you are more detached, as if watching a movie instead of being thrown into the movie. Well, DOC is first and foremost a psychedelic, but can be also be more "movie-like" especially when you're getting thrown about in the psychedelic headspace. It might be this very quality people are describing when they say they can function in public better with this psychedelic. Sorry if I've used poor language. I've taken DOC with MXE before and found it brought out this quality even more.