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> However, the > electrical responses of the cortex comprise a cascade of changes and > components of different latencies, and > it is not clear which of these would best correlate with BOLD signal. Interesting and important point. Nikos Logothetis has been claiming recently that it looks like LFP is going to show the best correlation with BOLD contrast, based on fMRI & simultaneous electrophysiology in monkey. Geraint ___________________________________________ ***NOTE NEW ADDRESS FROM 28TH FEB*** Institute of Cognitive Neuroscience University College London Alexandra House 17 Queen Square London WC1N 3BG voice +44-(0)20-7679-5496 fax +44-(0)20-7813-2835 email [log in to unmask] web http://www.klab.caltech.edu/~geraint ____________________________________________