Abstract
ABSTRACTInvestigations on the semantic priming effect (SPE) in patients after left hemisphere (LH) lesions have shown disparities that may be explained by the variability in performance found among patients. The aim of the present study was to verify the existence of subgroups of patients after LH stroke by searching for dissociations between performance on the lexical decision task based on the semantic priming paradigm and performance on direct memory, semantic association and language tasks. All 17 patients with LH lesions after stroke (ten non-fluent aphasics and seven non aphasics) were analyzed individually. Results indicated the presence of three groups of patients according to SPE: one exhibiting SPE at both stimulus onset asynchronies (SOAs), one with SPE only at long SOA, and another, larger group with no SPE.
Highlights
The semantic priming effect (SPE) can be understood as an improvement in performance derived from context, in which target processing is facilitated by the preceding stimulus because of a semantic association between them
Group analysis showed accuracy of between 75% and 95% depending on the target.[8]
Three groups of participants were discriminated according to the SPE
Summary
The semantic priming effect (SPE) can be understood as an improvement in performance derived from context, in which target processing is facilitated by the preceding stimulus (prime) because of a semantic association between them. The left hemisphere (LH) plays an important role in this phenomenon,[1] but it is unclear whether patients with LH lesions have a similar SPE to controls. No previous studies evaluating non-aphasic patients with LH lesion were found. Studies evaluating non-fluent aphasics are inconclusive.[2] Some studies found the SPE in expressive aphasics[3,4,5] whilst others did not.[6,7]. SPE findings in these patients were inconsistent, probably because of methodological differences among studies (number and characteristics of patients’ lesions, task stimuli, stimulus onset asynchrony, and so on).[8] With regard to non-fluent aphasia in particular, a previous review[2] showed that even when controlling stimulus onset asynchrony (SOA) (an important source of variance in the SPE), results remained conflicting
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