Dan Fugl1, Henrik Pedersen1, Henrik Bo Wiberg Larsson1
1Functional Imaging Unit, Department of Clinical Physiology and Nuclear Medicine, Glostrup Hospital, Glostrup, Denmark
We examined different measures of neuronal activation in the VEP signal recorded simultaneously with BOLD fMRI. The correlation of fluctuations in VEP and BOLD signals depend on the method of measuring neuronal activation in the VEP signals. We observed about a doubling of the correlation coefficients when going from a more conventional measure based on peak detection to a measure based on correlation with the grand mean VEP.