Abstract #1673

The Relationship Between 7T FMRI BOLD and MEG Derived γ Activity

Claire Stevenson¹, Matthew Brookes¹, Peter Morris¹

¹SPMMRC School of Physics and Astronomy, The University of Nottingham, Nottingham, Nottinghamshire, UK

BOLD data acquired at higher field strengths are thought to be closer to the true site of neural activation, which should result in a response amplitude more closely related to true neuronal activity. MEG offers a non-invasive direct measure of neural activity. Here 3T and 7T BOLD data are compared to MEG derived γ band activity. Modulations in γ activity due to a graded visual stimulus are compared to variations in the BOLD response at 3T and 7T. It is found that modulations in amplitude of the 7T BOLD correlate better with MEG derived γ activity than 3T data.