This
special treatment of Schneiderian first-rank symptoms (which overlap
with the construct of bizarre delusions and “special” hallucinations) led
to criterion A becoming excessively complex and redundant in DSMIII-R.
In DSM-III-R, there were three separate criteria A (A1 [two or
more characteristic symptoms], A2 [bizarre delusions], and A3 [special
types of hallucinations — Schneiderian first-rank hallucinations]) — the
DSM-IV review found this to be unnecessarily complicated (Flaum et
al., 1998). In DSM-IV, it was decided to retain criterion A2 while folding
the A3 criterion into A2. In DSM-IV