A computer scientist looks at the brain:

“You” are just a subroutine, and a recently-added one at that. You’re like a user-mode driver that gets access to certain kernel data, but you only see and control what the kernel lets you. You have no direct access to the kernel’s process space, but you can make calls into it, and you get notifications from it. The bulk of your nature as a human lies entirely outside your process space, outside your ability to directly perceive or control.

The Multiple Self