What if a person claiming to get messages from God was examined and found to have brain activity quite like that of persons who are diagnosed as mentally ill... what if all of this is true, yet it is also the case that the purportedly prophetic messages repeatedly proved true?
Integral to Dembski's idea of specified complexity (SC) is the notion that something extrinsic to evolution is the source of the specification in how it develops. He compares SC to the message sent by space aliens in the movie "Contact." In that movie, earthbound scientists determine that radio waves originating in from somewhere in our galaxy are actually a signal being sent by space aliens. The scientists determine that these waves are a signal is the fact that they indicate prime numbers in a way that a random occurrence would not. What is interesting to me is the fact that Dembski relies upon an analogy with a sign rather than a machine. Like a machine, signs are produced by an intelligent being for the sake of something beyond themselves. Machines, if you will, have a meaning. Signs, if you will, produce knowledge. But the meaning/knowledge is in both cases something other than the machine/sign itself. Both signs and machines are purposeful or teleological...
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I guess my point in posting that is that being able to measure correlations between what people say and their brain activity is not necessarily the same as knowing the cause of what people say. A scientist who observed what I described would be left scratching his or her head and might eventually acknowledge that something more is going on than can be measured with tools made by human hands.