I assumed you were a freshman. If so, you need to SIR by May 1. Are you a transfer?
We were looking at CHP at UCI and at the CHP open house, they said that in order to get the classes you want for pre-med, you should be in Biological Sciences and not Social Sciences. Yes, I know you can apply to med school with any major as long as you take the pre-req classes. At UCI, they said that it was difficult to enroll in pre-med required courses if your major is in the social sciences. They repeated it over and over and over again. Maybe someone who goes to UCI and has tried to register for classes outside of their department can speak to this. For us it was enough of a reason to take UCI out of consideration.
As far as cog sci vs psych, they are often in the same department so likely an easy switch if you are interested. Definitely major in what interests you . If you were interested in being a pediatrician it wouldn’t matter but you mentioned neurology so I wanted to point out a neuro based major that you might not be aware of.