I'm about to start studying Neuroscience and from what I can tell, you can go down one of two routes if you want a job directly related to Neuroscience. Going into the world of academia (as previously mentioned) or doing post-graduation Medicine and (probably.. I assume) specialising in Neuroscience/Neurology(?). Being an international student and therefore bi/tri (or whatever) lingual would probably aid a post-grad application for Medicine I guess, anything that adds to your application.. For academia though, I don't think it would make a difference, you would just need to be fully fluent in English.