Three possibilities come to mind:

Is there an evolutionary purpose?

Does it arise as a consequence of our mental activities, a sort of side effect of our thinking?

Is it given a priori (something we have to think in order to think at all)?

EDIT: Thanks for all the responses! Just one thing I saw come up a few times I’d like to address: a lot of people are asking ‘Why assume this?’ The answer is: it’s purely rhetorical! That said, I’m happy with a well thought-out ‘I dispute the premiss’ answer.

  • dmention7@lemm.eeEnglish
    0·
    5 months ago

    Yeah, this is it.

    And to take a slightly different tack, if the biochemical and electrical activity in your brain were not deterministic, how would you ever know? It’s one thing to believe that you made a decision on your own “Free Will”, but how could you possibly rewind the entire universe (or at least some sufficiently small portion of it), including your brain’s exact atomic state, and re-run the experiment to know for sure? At that point, what would “Free Will” even mean?