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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!paladin.american.edu!auvm!DRETOR.DCIEM.DND.CA!RANDALL
- Message-ID: <9212172313.AA10051@dretor.dciem.dnd.ca>
- Newsgroups: bit.listserv.csg-l
- Date: Thu, 17 Dec 1992 18:13:13 EST
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- From: "Allan F. Randall" <randall@DRETOR.DCIEM.DND.CA>
- Subject: Memory and Imagination -- REPOST
- Lines: 45
-
- This is a repost of an article I sent out around the time we lost our
- Internet feed. I don't know if it was successfully distributed or not,
- but since I haven't seen any replies, I'll assume the worst and repost
- it. If anyone has replied, it did not make it to DCIEM. My apologies if
- you receive two copies of this.
- -- Allan Randall
- ----------------------------------------------
-
- Hi all,
- Although there have been delays, I am happy to say that I am now working
- full-time on Martin Taylor's control project. I will be working in
- conjunction with Chris Love and Jeff Hunter.
- Anyway, my first order of business is to get more properly grounded in
- control theory, so I have just finished giving "Behaviour: The Control Of
- Perception" a thorough reading (BTW, my formal background is in computing
- and AI).
- I am intrigued by the model of memory presented in Chapter 15. Bill, is
- this still your working model, or has it changed? (I know its been a while
- since you wrote the book). Do you still see the basic function of memory
- as providing reference signals? Do you see the imagination loop as
- operating through memory as it does in the book? Or have the intervening
- years changed your conception of the problem? My conception of the diagram
- on page 221 is that the memory unit would take references from the
- higher level ECSs and remember how the world is supposed to act, so the
- memory is basically a little toy world inside the ECS (a toy world, that
- is, for all the ECSs above it that feed it references). This is a neat
- model, I think, especially with the switches that give the four
- different modes of behaviour. But I also realize there are probably many
- other spcific ways of implementing memory that do not conflict with the
- basic HPCT scheme, so I am wondering how you feel about this model now,
- twenty years later.
- I had previously thought of imagination mode as one ECS telling upper
- levels that they are controlling, even though they aren't. However,
- talking with Martin recently, he pointed out the need to imagine that a
- reference has NOT been satisfied, as well as imagining that it had, I
- realized this model can do this as well. If the memory box is acting as
- a little toy world, then it can respond in imagination mode that
- "no, this won't work." -- the higher level ECS will experience prolonged
- error in imagination.
- I also found it interesting that you used the RNA model of memory. Have
- you dropped this idea since the RNA theory has fallen out of favour?
-
- Allan Randall, randall@dciem.dciem.dnd.ca
- NTT Systems, Inc.
- Toronto, ON
-