Type of Document Dissertation Author McArdle, Joseph Jude Author's Email Address email@example.com URN etd-04172006-115934 Title Semantically Based Lexical Processing Yields Unique Topographic Contributions to the Speech Bereitschaftspotential Degree PhD Department Psychology Advisory Committee
Advisor Name Title Bell, Martha Ann Committee Co-Chair Braun, Allen R. Committee Co-Chair Friedman, Bruce H. Committee Member Harrison, David W. Committee Member Hoffman, Kurt A. Committee Member Schulman, Robert S. Committee Member Keywords
- speech motor planning
Date of Defense 2006-04-03 Availability unrestricted AbstractSEMANTICALLY BASED LEXICAL PROCESSING YIELDS UNIQUE TOPOGRAPHIC CONTRIBUTIONS TO THE SPEECH BEREITSCHAFTSPOTENTIAL By Joseph J. McArdle
Martha Ann Bell, Ph.D. & Allen R. Braun, M.D., Co-Chairs
The Bereitschaftspotential (BP) is an event related potential believed to reflect motor planning and preparedness. Although the relationship between the BP and volitional movements of the distal limbs is well established, studies of the BP and speech have produced inconclusive findings. The most heavily debated of these findings were reports of left lateralized hemispheric asymmetry in the BP topography, shortly before speech onset. Several researchers argued that these shifts were artifacts produced by movements of the articulatory muscles. However, methodological differences between the studies could also explain why the asymmetry was not always found. In the present study it was proposed that articulatory complexity and semantic processing each contribute to observed variations in the speech BP topography. Eighteen healthy volunteers performed 3 speech tasks, designed to distinguish semantic and articulatory contributions to the BP topography. The findings suggested that articulatory complexity and semantic processing each uniquely contribute to the frontolateral and medial BP topographic distribution. The present study also introduced the use of Doppler imaging of the tongue as a means of eliminating potential artifactual tongue movements from the speech BP.
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