Abstract #0756

Variability in Distribution of fMRI BOLD Response Linked to Prestimulus Alpha Power in Simultaneously-Acquired EEG

Jennifer Marie Walz¹, Michael Carapezza¹, Bin Lou¹, Robin Goldman¹, Truman Brown², Paul Sajda¹

¹Biomedical Engineering, Columbia University, New York, NY, United States; ²Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, United States

We investigate the variability of the fMRI BOLD response related to natural waxing and waning of attention during a simple auditory target detection task. We use the prestimulus alpha power in simultaneously-acquired EEG as a measure of attention, and contrast the BOLD response for high vs. low attention trials. We show that when task-engagement wanes, recruitment of brain areas becomes limited, involving only the minimum areas required for the task.