Our thoughts are an electric cloud and I believe randomness is involved, and like a bolt of lightning, the path taken is unpredictable.
And make it a tempestuous lightning storm where the state of all lightning bolts represents a moment of consciousness. That will take a lot to model accurately.
An electric cloud with quantum effects that we also don’t fully understand. There will always be a layer deeper that we just do not know the effects of or what actually exists there or “under there”.