@lookingforward What do you mean by “taking out the STEM”? I don’t see the harm in having a strong focus on research. Isn’t having a clear dedication to one activity (ostensibly related to his major) preferable to having more non-STEM extracurriculars that are unrelated to what he wants to pursue?
@paul49ers I do think that your focus on neuroscience research will help, especially if you can communicate why that specifically has intrigued you through our high school career. Your scores & GPA are obviously good enough.
Best of luck! 
Chance me back? http://talk.collegeconfidential.com/what-my-chances/1966406-chance-me-upenn-ed-yale-brown-princeton-etc-will-chance-back-p1.html