We currently think that it is, but that's not to say that we won't turn out to be wrong. Maybe someday we will come up with a coherent model for how things like

We currently think that it is, but that's not to say that we won't turn out to be wrong. Maybe someday we will come up with a coherent model for how things like mood, your current gut fauna, the amount ambient light, what you ate/drank over the past few weeks, etc. affect how you act and do. Well, what happens when/if we nail that model down and find out that it doesn't account for some wibbly-wobbly quantum going on in the dense electrical storms of our brains, which pulls in information from somewhere else from time to time? Don't try to answer a question like this authoritatively in the same paragraph that you mention you're currently a student...