Speaker: Jim Lee

Title: Reproducibility of the word frequency effect: comparison of signal change and voxel counting.

Authors: Chee, Lee, Soon, Westphal, Venkatraman.

Reference: Neuroimage 18 (2003) 468.

Abstract: fMRI activation is often measured by counting the number of statistically significant voxels: i.e., those voxels whose signal over time correlates with the task timing. A different method that may be more stable, and more accurate, is to compute the percent signal change in the statistically significant voxels. I will talk about the background for this method, share results from the paper, and illustrate the difference between the two methods with fMRI data from autistic subjects.