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Abstract #2070

Signal Processing Spreads a Voxels Temporal Frequency Task-Activated Peak and Induces Spatial Correlations in Dual-Task Complex-Valued fMRI

Mary C. Kociuba 1 and Daniel B. Rowe 1,2

1 Department of Mathematics, Statistics, and Computer Science, Marquette University, Milwaukee, Wisconsin, United States, 2 Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin, United States

Given a dual-task experimental design with different task periods, two distinct task-activated peaks are expected. Signal processing will alter the activated voxels temporal frequency spectrum, by spreading voxel task activated peaks temporally and spatially into neighboring frequencies and voxels. If the period of both tasks falls within a close range, without knowledge of the expected task-activated regions, it is difficult to resolve the task to the associated region after processing. Modeling the impact of signal processing, with respect to the task-activated frequency, is critical to developing methods to account for artificial correlations, while preserving the signal of interest.

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