the reason I asked this question is because I did basic science research in undergrad and it didn't amount to anything. the research topic was very interesting but the lab PI basically just took all the credit. he/she would just use the undergrads to do the grunt work and he would do the write-up him/herself. the undergrads would get like an honorable mention and that was it. no 1st, 2nd, or 3rd author.
last year, I spent 6 months in a neurobio lab, 10-15 hrs/week, and got nothing to show for it but lab experience. it looked good on my resume for applying to med school, but for residency you need actual showable results, like a publication. they don't care if you have lab experience without any publications. compare this to my friend who started basic science research in a psych lab for 3-4 hrs/week and got a publication out in a few months and another one a few months later.
I think the takeaway msg from all the replies is basic science is very high risk. it takes a long, long time and is really hit or miss. you may get in with a good PI who lets you do a lot and pushes you to get published or you might get shafted. because of the high demand of time med school requires of you, I doubt I will be willing to put in 10-15 hrs of research/week on basic science.
I think I'm just going to study and adjust the first year and try clinical research for the summer in between M1 and M2 years. Maybe I'll try spending sometime in a clinical research lab in the spring of M1 year so I can get into a good program for the summer...
thanks for all your help!