Hemispheric contributions to semantic activation: A divided visual field and event-related potential investigation of time-course.

Smith, Erin R., Chenery, Helen J., Angwin, Anthony J. and Copland, David A. (2009) Hemispheric contributions to semantic activation: A divided visual field and event-related potential investigation of time-course.. Brain Research, 1284 125-144. doi:10.1016/j.brainres.2009.05.053


Author Smith, Erin R.
Chenery, Helen J.
Angwin, Anthony J.
Copland, David A.
Title Hemispheric contributions to semantic activation: A divided visual field and event-related potential investigation of time-course.
Journal name Brain Research   Check publisher's open access policy
ISSN 0006-8993
1872-6240
Publication date 2009-08-11
Sub-type Article (original research)
DOI 10.1016/j.brainres.2009.05.053
Open Access Status Not Open Access
Volume 1284
Start page 125
End page 144
Total pages 20
Editor Floyd E. Bloom
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject C1
920107 Hearing, Vision, Speech and Their Disorders
170204 Linguistic Processes (incl. Speech Production and Comprehension)
Formatted abstract
Hemispheric contributions to lexical-semantic processing were investigated using event-related potentials and a divided visual field semantic priming paradigm. Hemispheric activation for pairs related via semantic category membership and association (CA) or via semantic category membership only (CO) was examined over two stimulus onset asynchronies (SOAs). Experiment 1 employed a SOA of 250 ms, and Experiment 2 employed a SOA of 750 ms. Controlled semantic priming was targeted in both experiments via a high relatedness proportion. Behavioral accuracy data revealed significant bilateral priming for both CA and CO conditions at 250 ms SOA. At 750 ms SOA hemispheric differences were observed within the behavioral data, with significant priming of the CO condition and priming for the CA condition approaching significance in the left hemisphere, and significant priming of the CA condition only in the right hemisphere. At 250 ms SOA, ERP analysis revealed bilateral CA activation in the N400 and LPC time windows. The second experiment (750 ms SOA) revealed bilateral CA priming during the N400 time window, with no significant LPC effects. The CO condition did not elicit significant ERP priming within either time window at either SOA. The results indicate no hemispheric differences for the ERP measures, with bilateral hemispheric N400 priming observed for associated category members irrespective of SOA, and a bilateral LPC effect at 250 ms SOA only, under controlled semantic priming conditions.
© 2009 Elsevier B.V. All rights reserved.
Keyword Controlled processing
Divided visual field
Event-related potential
Hemispheric contribution
Semantic priming
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Published under "Cognitive and Behavioral Neuroscience".

 
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Created: Wed, 24 Feb 2010, 02:04:35 EST by Meredith Downes on behalf of School of Health & Rehabilitation Sciences