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- Message-ID: <199212111853.AA04935@ux1.cso.uiuc.edu>
- Newsgroups: bit.listserv.csg-l
- Date: Fri, 11 Dec 1992 12:53:32 -0600
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- Comments: Warning -- original Sender: tag was cziko@UX1.CSO.UIUC.EDU
- From: "Gary A. Cziko" <g-cziko@UIUC.EDU>
- Subject: Perception
- Lines: 49
-
- [from Gary Cziko 921211.1544 GMT]
-
- Bill Powers (921210.1900), thanks so much for explaining how:
-
- >We can set up a model
- >environment in which there are several variables -- "v's." The input
- >function can produce a perceptual signal that is any weighted sum of
- >these variables, arbitrarily weighted. Then we can set up the output so
- >that it affects these variables either positively or negatively as
- >required for negative feedback, but all by the same amount, proportional
- >to the integral of the error signal. This control system will proceed to
- >control its perceptual signal just as if there were a single external
- >variable corresponding to it. If any or all of the v's are disturbed,
- >singly or in any combinations, the perceptual signal will be maintained
- >close to the given reference signal by an appropriate change in the
- >output effects on all the variables. . . .
-
- >So this control system experiences an entity in the environment that
- >does not in fact exist there. It is creating the entity. Nevertheless,
- >the behavior of the environment is lawfully and reliably related to the
- >perceptual signal, as long as the form of the input function remains the
- >same.
-
- Bill, I can't believe that this was staring me in the face all the time and
- I never realized it. Have you made this point explicitly before? If so,
- how did I miss it?
-
- This will go a long way to help me start sorting out my problems in
- understanding how perception works, particularly concerning its bottom-up
- vs. top-down nature and the issue of whether perceptions are "transmitted"
- from the environment to us via our sense organs or "constructed" deep in
- the brain (I think the answer is both "neither" and "both").
-
- Rick (Marken), do you remember how at the Indiana PA meeting in 1990 you
- were wondering how Ed Ford could say that we create our perceptual world?
- I believed you grabbed a chair and made comments about how you couldn't
- arbitrarily create or "uncreate" its perception. Isn't Bill's comment
- directly related to this issue.--Gary
-
-
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