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- Date: Sun, 16 Aug 1992 10:08:54 -0600
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- From: "William T. Powers" <POWERS_W%FLC@VAXF.COLORADO.EDU>
- Subject: Welcome, Fred
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- [From Bill Powers (920816.1000)]
-
- Fred Keijser (920813) --
-
- Hello, Fred, and welcome to our conversation.
-
- I have had some contact with Maturana; in some ways we have similar views,
- but we diverge greatly in other ways. Maturana's concept of autopoiesis is
- not worked out in any detail -- it's just a statement that some systems are
- "self-making." What such a system would have to be able to do in order to
- make itself isn't explained.
-
- There's a discussion of my views on Maturana in Living Control Systems II,
- available from Greg Williams.
-
- My biggest argument with Maturana regards his "closed" nervous system. If
- you're going to assume a model of a nervous system, this entails the whole
- theoretical structure that is behind it: neurology, physics, chemistry, and
- so on. So to claim that the nervous system is structurally closed is only a
- half-baked epistemology. If you admit of a physical nervous system, then to
- finish baking the idea you have to include the relationships of the nervous
- system to the physical external world -- which Maturana refers to as the
- "medium" and treats as an unknown black box. In my opinion he doesn't have
- a workable model -- only a sort of metaphor.
-
- As to "representation," PCT addresses it in two ways. There is perception,
- which is a signal-based representation of aspects of the current external
- world. There are also reference signals, which are signal-based
- representations of the intended state of the perceptions. The perceptual
- signals arise from sensory interaction with the external world. The
- reference signals are internally generated. Which aspect of representation
- are you concerned with?
-
- Again, welcome.
-
- Bill Powers
-