**4. Further Questions and Remarks**

The hypothesis assumes, for the sake of its reductio ad absurdum approach, that the system is reliably deterministically predictive. If so, then the system would be able to know whether the test subject wishes to rebut its deterministic predictions and will integrate that information into its predictive processing algorithms. Again, it would mirror these predictions of the inner state of their brain to the human actor, and the human actor would again be able to react with obeying or refuting this prediction. Eventually the potential reaction-time between prediction, presentation and the reaction would become too short for a resistive reaction on the part of the human actor. Therefore, we must define a threshold period for the game of prediction and reaction of, say, half a second or two seconds.

Furthermore, the hypothesis assumes that a free human actor is characterized by the desire to now and then falsify reliable deterministic predictions about their forthcoming behaviour. There is no empirical evidence for that, and it would be hard to find one that avoids the trap of tautology. Rather, this resistive desire is taken as a definition for a free will.

It should be noted that this thought-experiment is akin to the famous Newcombe's paradox with a perfect predictor. If we were to redesign Newcombe's paradox in the way that a perfect predictor would, in addition to our knowledge of the content of the box containing a million dollars or nothing, predict the complete physical/chemical/biological state of the brain of the human player and mirror it back to this very player (as indicated in Figure 2), it would be possible for this player to win the million dollars.

**Funding:** This research received no external funding.

**Acknowledgments:** The author wants to thank colleagues for their valuable time for discussion of the thought-experiment, especially Dieter Bandhauer, Lutz Musner, Andreas Obrecht, and Walter Peissl.

**Conflicts of Interest:** The author declares no conflict of interest.
