He points out that a patient in so-called PVS (permanent vegetative state) has markedly low global brain metabolism (like that of a person in slow wave sleep, or under general anesthesia). But what is remarkable is the fact that in the rare case in which such a patient recovers consciousness, they still show a reduced brain metabolism. In other words, a low brain metabolism is not sufficient to demonstrate PVS.
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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