The NIMH Data Archive (NDA) contains EEG and fMRI data which may be helpful.  The NDA is an expansion of the National Database for Autism Research (NDAR) which now includes most research related data collected from mental health grants through the National Database for Clinical Trials related to Mental Illness (NDCT) and the Research Domain Criteria Database (RDoCdb).  

You may apply for free access by completing the attached Data Use Certification (also available at https://ndar.nih.gov/access.html) and submitting it to the NDA Help Desk at NDAHelp@mail.nih.gov.  You will need to complete the document, sign it, and have it signed by someone at your institution with signature authority.

Regards,
Gretchen 

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Gretchen Navidi [C]
NIMH Data Archive (NDAR, RDoCdb, NDCT, Pediatric MRI)
Office of Technology Development and Coordination | Office of the NIMH Director
National Institute of Mental Health/National Institutes of Health
6001 Executive Blvd., Room 7157 Rockville, MD 20852
Phone: 301-443-7725 | navidig@mail.nih.gov
http://ndar.nih.gov/| http://ndct.nimh.nih.gov/ | http://rdocdb.nimh.nih.gov/ | http://pediatricmri.nih.gov/