Estimation of the dipole sources of scalp-recorded P300 data was performed with signal source analysis software ASA 3.0 (Advanced Source Analysis; ANT Software BV, www.ant-neuro.com/products/asa/). ASA delivered the MRI of the MNI305 brain which was already transformed to the Talairach space. The software also delivered standard electrodes and head model files that matched the MNI305 MRI. Therefore, the estimated coordinates from the source localization were in the Talairach space.
