Maybe this early signal isn't a full decision, it's just like a nudge that you get, it's just biasing you one way, but its not really finally making up your mind. Decisions are caused by unconscious brain processes, then consciousness kicks in later. It is subjective experience that you think that you have free will. It's something that is implausible, its incompatible with the scientific deterministic universe anyway. (2012) source Unverified