Misconception Repair Lab
Treating a long-standing trait as an active episode (or vice versa)
-
1. The tempting shortcut
"This person has always been strange, so it's just how they are" — or the reverse: "This is strange, so it must be a new illness."
-
2. Stop and think
Before you read on: what is wrong with this reasoning? Try to answer in your own words, then reveal the explanation below.
-
3. Reveal — why it fails
F20-F29 contains both episode-based categories (F20, F23, F25) and a trait-based category (F21). Getting this distinction wrong in either direction causes real errors: missing a genuine new psychotic episode in someone with schizotypal traits, or over-pathologising a stable lifelong pattern as an acute illness.
-
4. Reveal — the better reasoning rule
- Has this always been the person's baseline, or is it a clear change from how they normally are?
- If it is a change, how long has the change lasted, and does it meet an episode-based category's duration/severity threshold?
- If it has always been present, does it amount to a sustained, frank psychotic episode at any point, or does it stay at the level of an enduring odd-but-stable pattern?
Corrective example: Aftab (see the F20-vs-F21 boundary case) has lifelong schizotypal-like traits, but a clearly new six-week episode of thought broadcast and thought disorder is layered on top — the new episode is classified on its own terms (F20), without either ignoring it as 'just how he is' or retroactively relabelling his whole life as schizophrenia.
5. Try the transfer case
Apply the better rule above to a fresh case.