Sam Harris is also discussed in the thread “The Illusion of Free Will”.
Because it is a proper noun, “Objectivism” and “Objectivist” should be capitalized.
You already know about the thread “Weak vs. Strong Emergence”
“Scientific Challenges to Free Will” makes many good points, but one which appears there and which I have used in the past is that these reaction time tests are pointless because we do not need free will to follow an urge on a cue. ‘That is not what free will is for’, to hijack and paraphrase someone else’s phrase. A single instance of an explicit self-consciously carefully reasoned conclusion which one accepts and acts upon although it may be surprising or against one’s prior biases or assumptions is sufficient to establish the existence of volition even if much of our other behavior is rote or automatized. Or in other words, ‘downward causation’ from the conceptual level into physical action is what free will is for.