Someone said how do you gauge autism severity, but I also would ask, how can you know that a forum member is introspective? How would you determine that? We sometimes see someone say they have lurked for quite a while before posting for the first time. Presumably that person was introspective, but wouldn't even register until they decide to participate here.
In other words, I'm not calling it a tautology, but I see it as probably impossible to get an empirical answer.
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A finger in every pie.