Reproducibility of the Word Frequency Effect: Comparison of Signal Change and Voxel Counting

NeuroImage 18 (2003) 468–482

15 Pages Posted: 7 Nov 2014

See all articles by Michael Chee

Michael Chee

Duke-NUS Graduate Medical School Singapore

Hwee Ling Lee

Duke-NUS Graduate Medical School Singapore

Chun-Siong Soon

Duke-NUS Graduate Medical School Singapore

Christopher Westphal

Duke-NUS Graduate Medical School Singapore

Vinod Venkatraman

Temple University - Department of Marketing and Supply Chain Management; Temple University - Decision Neuroscience

Date Written: April 29, 2002

Abstract

We determined the reproducibility of both the direction and the effect size of the word frequency effect (WFE) as it relates to associative semantic judgments. Sixteen volunteers were scanned twice. At the group level of analysis, signal change and voxel counting could both reproducibly detect the existence of a WFE. However, signal change data showed less intersession variation, particularly in the left inferior frontal gyrus. The effect size of WFE was well reproduced only with signal change measurements. In consideration of the signal change data, statistical threshold did not have a major effect on the detection or determination of the effect size. In general, while the direction of the WFE was reasonably reproducible at the individual level, the effect size was far less well reproduced. These findings suggest that with existing techniques, fMRI may be used to track changes in brain activation stemming from improvement in language proficiency at the group level but not at the individual level.

Suggested Citation

Chee, Michael and Ling Lee, Hwee and Soon, Chun-Siong and Westphal, Christopher and Venkatraman, Vinod, Reproducibility of the Word Frequency Effect: Comparison of Signal Change and Voxel Counting (April 29, 2002). NeuroImage 18 (2003) 468–482. Available at SSRN: https://ssrn.com/abstract=2430762

Michael Chee

Duke-NUS Graduate Medical School Singapore ( email )

Singapore
Singapore

Hwee Ling Lee

Duke-NUS Graduate Medical School Singapore

Singapore
Singapore

Chun-Siong Soon

Duke-NUS Graduate Medical School Singapore

Singapore
Singapore

Christopher Westphal

Duke-NUS Graduate Medical School Singapore

Singapore
Singapore

Vinod Venkatraman (Contact Author)

Temple University - Department of Marketing and Supply Chain Management ( email )

Philadelphia, PA 19122
United States

Temple University - Decision Neuroscience ( email )

Philadelphia, PA 19122
United States

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