This study of 70 schizophrenic patients used a lexical decision task i
nvolving the recognition of words that were preceded (primed) either b
y meaningfully or phonologically associated or by nonassociated words
to study the intrusion of contextually inappropriate associations in t
hought disorder (TD). The patients were split into subgroups of TD and
non-TD patients, and the data from these two groups were compared wit
h data from 44 normal control participants. TD schizophrenic patients
exhibited more semantic priming than non-TD patients and controls, and
differences in phonological priming dependent on stimulus onset async
hrony (SOA) were obtained. Results support the hypotheses of an increa
se in activation or a decrease in inhibition in the spreading of seman
tic and phonological associations in TD schizophrenic patients.