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The BOLD correlates of the visual P1 and N1 in single-trial analysis of simultaneous EEG-fMRI recordings during a spatial detection task
Neuroimage. 2011. Vol. 54 . P. 824-835.
Novitskiy N., Ramautar J., Vanderperren K., De Vos M., Mennes M., Mijovic B., Vanrumste B., Stiers P., Van den Bergh B., Lagae L., Sunaert S., Van Huffel S., Wagemans J.
Simultaneous EEG-fMRI measurements can combine the high spatial resolution of fMRI with the high
temporal resolution of EEG. Therefore, we applied this approach to the study of peripheral vision. More
specifically, we presented visual field quadrant fragments of checkerboards and a full central checkerboard in
a simple detection task. A technique called “integration-by-prediction” was used to integrate EEG and fMRI
data. In particular, we used vectors of single-trial ERP amplitude differences between left and right occipital
electrodes as regressors in an ERP-informed fMRI analysis. The amplitude differences for the regressors were
measured at the latencies of the visual P1 and N1 components. Our results indicated that the traditional eventrelated
fMRI analysis revealedmostly activations in the vicinity of the primary visual cortex and in the ventral
visual stream, while both P1 and N1 regressors revealed activation of areas in the temporo-parietal junction.
We conclude that simultaneous EEG-fMRI in a spatial detection task can separate visual processing at 100–
200 ms from stimulus onset from the rest of the information processing in the brain.
Language:
English
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