The relative emphasis
paid to these three perspectives has, however, varied over
time (Andreasen, 1989; Bruijnzeel and Tandon, 2011; Keller et al.,
2011), with the Bleulerian accent on negative symptoms and interpersonal
pathology leading to a broad definition reflected most
strongly in DSM-I and DSM-II. This led to a marked discrepancy between
the diagnosis of schizophrenia in the USA versus the UK and
perhaps much of Europe (Kendell et al., 1971; Wing and Nixon,
1975). In reaction to these inconsistencies, the operationalized
criteria of DSM-III narrowed the definition by requiring chronicity
and poor function and highlighting Schneiderian first-rank symptoms
in an effort to define a more homogeneous disorder.