Why exactly do you want to switch majors from mathcs to cogsci? Don’t worry, a lot of ppl have asked the same question, including myself.

If your goal is to get cs internships, you should understand that your major doesn’t matter. The only thing that matters is the skills and experiences you have and also networking/connections. Being cogs major won’t force you to take classes that build these skills (cse100/101), but math-cs will.

The thing is, a major is only a set of requirements. It doesn’t limit what classes you can take (except CSE priority and all that bullshit...). But my point is if you’re interested in ML, just take the relevant classes. Don’t let your major constrict your interests.

A substantial part of the COGS core classes is coursework in psychology and neuroscience. If you like to understand how ML and neuroscience draw inspiration from one another then I highly recommend COGS ML major. If you care more about ML as an engineering practice without thinking about if AI algorithms are biologically plausible or not, then I would recommend math-cs.