The simple way of seeing it is that you're executing machine code but it takes time for the compiler to make it readable in a way for you to interpret the code you just fired off. Basically half your brain that is you is running on a low level language and the other one is on a higher level language. That's why we're able to (literally) compile the abstract and simple into complex language.

Likewise, it's why you can literally program yourself to function differently by writing high level language that after compilation will be interpreted in the future by the hardware. Hence things like the "cycle of depression" and "placebo effects".

So it's still free will, there's just a bit of lag between the CPU and the software. Because the CPU is just hardware running binary, it's why it's easier to decrypt and read the signals bring processed - thus why we have machines that know what you'll think before you know what you'll pick, but not machines that can read thoughts (those can be defeated by making it so you don't become aware of what you'll pick through blind randomization btw - also another similarity with computers).