free will without metaphysical

1) you presented a few non deterministic systems, however most systems are deterministic. Actually, the fundamental nature of the universe is such that no system is deterministic. However, most of the time things behave as if they are, because the averages dominate. We don't have to worry about suddenly falling through the floor because the statistics make that extremely unlikely. Still, many large things are determined by very small changes. this is a part of chaos theory. It's summarized by the notion that the fluttering of a butterfly in Beijing may upset tomorrow's weather here. The brain depends upon trillions of neurons and synapses, so it's quite likely that brain operation is not deterministic. 2) You say there are events without cause. With regard to decisions there clearly are causes (i.e. genetics and external factors). Free will would just be another force/factor. The problem is that without determinism, free will seems undefined. I don't agree that free will has the nature of a force. I think it is a process. The best I can conjure is that free will is like a computer program. Humans use it to process events to arrive at actions. The general nature of the program is determined by heredity, but at any time the program has been modified by past experience and it is also subject to random events that change the decision paths. 3)You say there are events without cause, decision based on free will is an event with a cause as will would have to be some sort of physical cause. This gets back to how free will is defined in a universe that is not deterministic. Originally, free will was a departure from determinism. Without determinism, what is free will? Events definitely are the inputs to decision making, so free will depends upon events. However, neither the input events or the free will process can be necessarily repeated, so we cannot say that the same result will always occur. 4)This physical cause will is found no were else in the universe. Are you saying that free will will be found nowhere else? Remember, you set the ground rule that the debate was to exclude metaphysics. That means we are only able to use empiricism. Since the whole universe has not been observed we do not know whether free will exists elsewhere. I think that chances are that there are probably intelligent life forms that are subjectively conscious and have free will, but I don't know. I think that once we understand subjective consciousness, we'll have better understanding of what is involved. 5)You provided a non deterministic random system. Are you proposing that free will decision is random? Partly random, but not entirely, I claim that free will is now undefined. We still have some concept of free will, but it needs an entirely new definiion. If there is a valid definition, then I suppose free will must be a type of process that is both non-deterministic and self-modifying. In other words, our decisions depend upon a combination of our genetic makeup, our experience of events including all our past history, and randomness. How do you define free will? You cannot use the concept of a deterministic universe in the definition, because that does not exist. Your initial argument posed the question so that free will was the exception to determinism.