The EEG-fMRI session will be conducted at the University of Minnesota Center for Magnetic Resonance Research. If a subject has any metal implant in his/her body, s/he must not participate in the MRI test. After subjects pass through the routine screening for participation in the MRI test, an EEG cap with 64 electrodes will be put on his/her scalp and electrically conducting gels will be applied to each of these electrodes. One more electrode will be put on his/her back to record electrocardiographic signal. The electrodes location will be recorded by means of a device which can tell the positions of the electrode sensors. The EEG preparation procedure will take around 30-45 minutes. Then a 15-minute EEG will be recorded out side of the scanner. Afterwards, the subject will be asked to lie down in a MRI scanner with the EEG cap on his/her scalp. The electrodes will be connected to a data collection system and electroencephalograms and fMRI will be collected and stored simultaneously onto the computer of the recording system. During the scan, subjects will be asked to close his/her eyes but keep awake. Or subjects may be also asked to perform some simple tasks. For example, subjects may be asked to tap his/her finger regularly or imagine some movements. The EEG-fMRI scan will take around 2 hours. After the recording session, subjects may want to wash his/her hair to clean out the electrically conductive gels. Although the EEG and MRI procedure can be performed as a routine clinical test, in this instance it is being performed for the research and not for his/her clinical care.