There are some experiments that suggest that human actions are not the result of conscious thought. Maybe you've heard about Michael Gazzaniga's experiments on split brain subjects. The most radical interpretation of the results is that our conscious thought merely constructs a narrative about actions it has no direct control of.

In other words, our brains act like a bunch of interconnected neural networks and one of them, the language processing part, tries to make sense of what all the others are doing, serving the only purpose of communicating with others.