Hi Premdass,
I also posted about Neuroscience, though coming from a Psychology background. I have researched this quite a bit, and I know that not all courses require under-grad of medical science. The King's college course has predominantly Psychology graduates, followed by Biomedical Graduates. I have also seen a number of courses which specifiy that Computerscience is certainly acceptable.
Medical graduates are not preferred at all, though Biological science graduates I feel are the majority for most courses. Pharmacology and Biology students especially.
This is not to say that Psychology graduates and Computerscience graduates are not accepted. I know they are, it's just about finding the right course for you.
Good luck!
Frogs