Da. Copland et al., Discourse priming of homophones in individuals with dominant nonthalamic subcortical lesions, cortical lesions and Parkinson's disease, J CL EXP N, 23(4), 2001, pp. 538-556
Citations number
54
Categorie Soggetti
Psycology,Neurology
Journal title
JOURNAL OF CLINICAL AND EXPERIMENTAL NEUROPSYCHOLOGY
An on-line priming experiment was used to investigate discourse-level proce
ssing in four matched groups of subjects: individuals with nonthalamic subc
ortical lesions (NSL) (n=10), normal control subjects (n=10), subjects with
Parkinson's disease (PD) (n=10), and subjects with cortical lesions (n=10)
. Subjects listened to paragraphs that ended in lexical ambiguities, and th
en made speeded lexical decisions on visual letter strings that were: nonwo
rds, matched control words, contextually appropriate associates of the lexi
cal ambiguity, contextually inappropriate associates of the ambiguity, and
inferences (representing information which could be drawn from the paragrap
hs but was not explicitly stated). Targets were presented at an interstimul
us interval (ISI) of 0 or 1000 ms. NSL and PD subjects demonstrated priming
for appropriate and inappropriate associates at the short ISL similar to c
ontrol subjects and cortical lesion subjects, but were unable to demonstrat
e selective priming of the appropriate associate and inference words at the
long ISI. These results imply intact automatic lexical processing and a br
eakdown in discourse-based meaning selection and inference development via
attentional/strategic mechanisms.