I have been researching this topic too, and find it very interesting. It is done studies showing we might not have free will. Which means that our decisions are determined before we decide conciously.

Some even go to the lenghts to say that these studies put sticks in the wheels for religions w/ free will. But I don't think it's that simple. And we don't know for sure if this govern all our behavior, or just some parts like; if you want milk in your tea or not.

source: https://blogs.scientificamerican.com/mind-guest-blog/what-neuroscience-says-about-free-will/