Greg Simpson, Ph.D.
Director, Dynamic Neuroimaging Laboratory
University of California, San Francisco

PET and fMRI studies have defined a number of cortical regions that are considered to comprise a network for anticipatory deployment of attention. I will present MEG/EEG brain imaging results that reveal that this network is a superset of multiple cortical networks that are active at different times during top-down deployment of attention. In addition, multiple oscillatory frequencies associated with different functional properties provide further differentiation of these cortical networks. Coherence and Granger causality analyses illustrate yet another dimension for functional specification of these networks. Future animal studies that define the relationship between oscillatory LFP activity and unit activity will be incorporated to provide greater specificity to the human MEG/EEG data.