It’s also incompatible with the observational data we’ve gathered so far. When we perform fMRI scans of the various structures of the brain and ask the subject to decide between binary options, the decision is made in the subconscious regions and then reported to the conscious regions. This means that when we’re deciding something, our “conscious mind” is told what’s being “thought about” and the eventual verdict, rather than being involved in it.

It appears that not only is free will non-existent, but consciousness may not actually be anything like we think it is. What we call consciousness may in fact just be the communication channels between the various brains that have been strapped on over the years.

Another example is when the connections between hemispheres are temporarily chemically “severed” the hemispheres begin behaving as two distinct minds. When isolating each hemispheres from the other’s field of vision from the other’s, you end up with extremely bizarre behaviors. One such behavior is the subject handing themselves an item from one hand to the next. They’re then asked how the item got into that hand. The response is universally that someone handed it to them.

My personal favorite rebuttal against free will though is “of course the brain would tell you it’s the master of the body.”