Regardless of small differences in how different fields may be perceived, I would not let this dictate which research you get involved in. Research is a challenging, demanding experience and nothing sucks more than researching something you don't care about or find intrinsically boring. Personally, after my first experience doing cell culture, westerns, and PCR, I'll never touch that kind of research again. I'll get way more fun and fulfillment doing research that personally interests me (or at the very least doesn't make me want to drink from the nearest flask of reagents).
Your involvement in research will be a positive for your application. Regardless of whether that research field is clinical, psychological, sociological, etc, your application will not be held back by the field of research that you choose--so choose something that you like and find interesting.