Spitting Camel said:
Calm down, buddy! Where did THAT come from? Maybe get a psych eval before school starts?
Finally, someone understands where I'm coming from.
To DemonDeacon: Don't even pay attention to Gleevec's braindead response. His posts are becoming about as worthless as his life. To answer your question, it would be close to impossible to tell if an institution does have a clear preference for one "type" of EC versus another without talking to a member of the admissions committee. I think you can get a good feel for this sort of thing by looking at members of the incoming class and their ECs...but this is just a really rough way to gauge whether the institution prefers one type of EC versus another...it's impossible for us to tell for certain.
That said, I think is it pretty likely that certain institutions do want to attract students that are in line with their "mission" and can be molded to fit their own image of what constitutes an "excellent physician." Some institutions are just hell bent on research (there are many of these). These schools want to produce the future Nobel Prize winners in medicine, the future faculty members at Harvard Medical School, the leading researchers in the fight against cancer, etc. The adcom members at said schools will seek out applicants with very strong research credentials (X number of years in a research lab, 1st authorship publications, strong letter of recommendation from a famous PI, etc).
Other schools might want to produce the future leaders in health policy. These schools would want their students to serve on the World Health Organization, design policies to help in effort to combat bioterrorism, serve on a commitee in the Food and Drug Administration, etc. The adcom members at these schools would probably seek applicants with extensive experience working for non-profit organizations, leadership experience in campus clubs, internships with governmental organizations, etc.
I doubt any med school would openly state what "type" of EC they prefer...but I really do think they take this into account when making their final admit/reject decisions. I also seriously doubt that ANY US med school would state that they prefer X EC over volunteer experience...or that they prefer volunteer experience over Y EC.
Final advice: Just do whatever exra-curriculars you're interested in and forget whether these ECs will give you an edge for admissions. If they do end up giving you an edge with an adcom, more power to you. If they don't, then you probably wouldn't have liked attending that med school anyway. Just do the ECs that you love and leave the rest to fate. In the end, it'll all work out.