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Test-retest reliability and stability of N400 effects in a word-pair semantic priming paradigm.
MedLine Citation:
PMID:  23122708     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVE: Elicited by any meaningful stimulus, the N400 event-related potential (ERP) component is reduced when the stimulus is related to a preceding one. This N400 semantic priming effect has been used to probe abnormal semantic relationship processing in clinical disorders, and suggested as a possible biomarker for treatment studies. Validating N400 semantic priming effects as a clinical biomarker requires characterizing their test-retest reliability. METHODS: We assessed test-retest reliability of N400 semantic priming in 16 healthy adults who viewed the same related and unrelated prime-target word pairs in two sessions one week apart. RESULTS: As expected, N400 amplitudes were smaller for related versus unrelated targets across sessions. N400 priming effects (amplitude differences between unrelated and related targets) were highly correlated across sessions (r=0.85, P<0.0001), but smaller in the second session due to larger N400s to related targets. CONCLUSIONS: N400 priming effects have high reliability over a one-week interval. They may decrease with repeat testing, possibly because of motivational changes. SIGNIFICANCE: Use of N400 priming effects in treatment studies should account for possible magnitude decreases with repeat testing. Further research is needed to delineate N400 priming effects' test-retest reliability and stability in different age and clinical groups, and with different stimulus types.
Authors:
Michael Kiang; Iulia Patriciu; Carolyn Roy; Bruce K Christensen; Robert B Zipursky
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-1
Journal Detail:
Title:  Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology     Volume:  -     ISSN:  1872-8952     ISO Abbreviation:  Clin Neurophysiol     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883319     Medline TA:  Clin Neurophysiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Ireland Ltd.
Affiliation:
Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, Ontario, Canada. Electronic address: kiang@mcmaster.ca.
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