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- Posted-Date: Wed, 02 Sep 92 09:35:57 PDT
- Message-ID: <199209021636.AA16704@aerospace.aero.org>
- Newsgroups: bit.listserv.csg-l
- Date: Wed, 2 Sep 1992 09:35:57 PDT
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- From: marken@AERO.ORG
- Subject: Re: Exploration and Reorganization
- Lines: 90
-
- [From Rick Marken (920902.0930)]
-
- Martin Taylor (920902 11:15), in response to my slogan:
-
- > "All PURPOSEFUL behavior is the control of perception".
-
- says:
-
- >It also comes perilously close to tautology
-
- Well, slogans are slogans.
-
- see Powers (920901.1000) where he says:
-
- >Rick said it: all control behavior is control of perception.
-
- etc
-
- I said:
-
- >Exploration and reorganization can "look" the same; but I think
- >you could tell the difference using the test.
-
- And Martin said:
-
- >They aren't even in the same domain, so I don't see how they could "look" the
- >same.
-
- I was not clear. I think of "exploration" and "reorganization" as words
- describing potential mechanisms underlying an observed behavior; I think
- of them as descriptions of models. I interpret your comment above to mean
- that you think of exploration as a description of behavior and reorganization
- as a description of a model. In this case, there is indeed nothing to compare.
- And I would argue that much of the behavior that would be described
- as exploration is actually the result of a reorganization process; other
- behavior that would also be called exploration is actually systematic,
- control behavior. For example, when a rat is placed in a test chamber
- it "explores" -- it sniffs around, climbs the walls, pushes on stuff, etc.
- It produces a lot of changing perceptions for itself; I think many people
- would describe this as exploration. Now, what is causing this behavior?
- One explanation is that it is caused by systematic variation in the
- rats' references for various perceptions, this variation being caused by a
- higher order system trying to achieve its own perceptual goal (which
- might be verbally described as "a perception of high familiarity").
- This explanation says that the exploration we see is a result of regular,
- systematic control processes -- and this could be tested using versions
- of the test for the controlled variable.
-
- Another possible PCT explanation of the SAME behavior would be that it
- is the result of reorganization. This explanation would be particularly
- plausible if we knew that the rat had not eaten for a day before being
- placed in the test cage. If the "exploratory behavior" is the result
- of reorganization then we would expect to see the variability of the
- behavior gradually eliminated as control of some particular aspect of
- the enviroment had effects that reduced intrinsic error.
-
- So that was the point of my comment; the SAME behavior (which could be
- verbally described as "exploratory") could have different internal causes.
-
- This whole discussion may not be relevant to what you were proposing --
- which seems like it may have been that "exploration" is an alternative
- to the reorganization model of learning. If so, then I would have to
- say "never mind". But, I would suggst that, along with your new model,
- you could tell us what observations it is meant to explain (that are
- not handled by the control hierarchy and reorganization model as it
- already exists) and how we might test your explanation vs the explanation
- provided by the existing model.
-
- I have often carried on about the importance of the phenomenon of
- control -- and knowing what that is before getting to involved in
- the modelling. I would just like to add one more caveat; it is also
- important to understand the difference between phenomena and the
- models that are designed to explain them. I know that you understand
- that difference Martin. But I think that we all must be careful (when
- we are talking about control phenomena) to be as clear as possible
- (in our expression and our understanding) about the difference between
- what we experience (phenomena) and what we imagine (models that we
- hope will explain the phenomenon).
-
- Best regards
-
- Rick
-
- **************************************************************
-
- Richard S. Marken USMail: 10459 Holman Ave
- The Aerospace Corporation Los Angeles, CA 90024
- E-mail: marken@aero.org
- (310) 336-6214 (day)
- (310) 474-0313 (evening)
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