I'm currently considering applying for MD/PhD programs but I think my interests for the PhD research track are a little, but not hugely different than my undergrad research experience. I mainly worked on a research project where, if I were to continue in the path of that research, would lend itself to a Psychology PhD. I think I'm more interested in a neuroscience PhD however. If I know a lot about the field and have demonstrated that I'm capable of handling research, does it matter if my undergrad research was a little different from what I want to do in the Md/phd programs?