the basis of the blocking generally lies in the significance the blocked chain of thought has for the patient. Conversely, in a patient about whom we do not know very much, one can conclude from the appearance of blocking that we have struck upon one of his important complexes.
Bleuler argues that blocking in schizophrenia is not random but complex-determined, functioning as a reliable clinical indicator of psychically significant material.
, Dementia Praecox or the Group of Schizophrenias, 1911thesis