Fig. 1.

Illustration of how ERP AM can achieve high temporal resolution in fMRI. A suitable paradigm in a simultaneous ERP-fMRI recording can be used to induce slow and localized AM (a, b, and c) at or below the sampling frequency of the MR data acquisition. In this example, the model AM are generated in separate areas sensitive to the manipulation and are detectable in both ERP and fMRI. Consecutive correlation analysis between the fMRI time series and the multiple ERP time series yields complementary information regarding the spatial location and timing of these processes. Neuroelectric source acitivities need not necessarily propagate to the scalp directly but can modulate or be modulated by remote sources (indicated by arrows).