The association disturbances were conceived of as being primary; from these we can derive the majority of secondary symptoms. In schizophrenia, the habitual well-worn pathways of association have lost their cohesiveness.
Bleuler establishes associative disturbance as the primary, generative defect in schizophrenia, from which virtually all secondary symptoms — hallucinations, stereotypies, affect-blocking — are derivable.
, Dementia Praecox or the Group of Schizophrenias, 1911thesis