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- Date: Wed, 2 Sep 1992 14:39:01 PDT
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- From: Penni Sibun <sibun@PARC.XEROX.COM>
- Subject: Re: Cooking; chapman; visual perception
- X-To: CSG-L%UIUCVMD.BITNET@pucc.princeton.edu
- In-Reply-To: "William T. Powers"'s message of Tue,
- 1 Sep 1992 20:27:59 -0700
- <92Sep1.203225pdt.11779@alpha.xerox.com>
- Lines: 96
-
- (ps 920902.1400)
-
- [From Bill Powers (920901.1900)]
-
- >a primary interactionist field, ethnomethodology, came
- >about explicitly in reaction to sociology. rather than asking ``how
- >can we describe the[s]e here institutions,'' it asks, ``are there
- >institutions, and if so what, and if so how constituted.''
-
- Sounds pretty much the same to me. In either case, the institutions
- are reified. Not that I don't believe in them. I just think they exist
- in people's heads, not in the environment.
-
- well, of course, to interactionists, institutions are neither in the
- head nor in the evironment, but.... this list, csgl, is an
- institution cause we are all participating in it. it's not my head,
- it's not in your head, and it's not out there in the environment
- somewhere just sitting around.
-
- Well-used, I'd say. Understanding how an object can play a role is
- something else. I think it makes a difference who is perceiving the
- object.
-
- yes, of course it does.
-
- If you objectify objects, you can't explain how the same
- object can have different roles depending on who's using it for what
- purpose.
-
- i don't see how this follows (unless ``objectify'' has a lot of
- connotations here).
-
- >a machine is deterministic if there is only one way
- >to get from one state to the next; it's nondeterministic otherwise.
-
- That's what I was asking about. If it's nondeterministic in that
- sense, then what selects which of the possible paths will be taken?
-
- that's not the machine's problem:
-
- ``...we shall...permit several possible `next states' for a given
- combination of current state and input symbol. the automaton
- [machine]...may choose at each step to go into any one of these legal
- next states; the choice is not determined by anything in our model,
- and is therefore said to be _nondeterministic_.''
-
- --lewis, h. and c. papadimitriou, _elements of the theory of
- computation_, prentice-hall, 1981.
-
- If
- there's some systematic selection method, then it's deterministic
- again.
-
- sure.
-
- So the question is, when there are alternate paths, what
- determines the path actually taken?
-
- as far as toast is concerned, i don't know if they actually say (i
- didn't see it). they may well have flipped a coin.
-
- >no, a history is what happens between one point in time and another
- >point in time.
-
- Do you mean that there are continuous processes taking place BETWEEN
- nodes? I had thought that an operation simply jumped you from one node
- to another.
-
- in section ``ontology of cooking tasks,'' a&h say: ``a _history_ is a
- function from natural numbers (representing `time') to world states.''
- roughly, a history is a record of what happens during a run of toast.
-
- Because the way the proposition is stated, it doesn't matter whether
- the agent breaks the egg into the pan or whether someone else blunders
- through the room and breaks it on the floor, or if the agent finds it
- already broken in the carton. If it's broken the goal is satisfied,
- the way I read it.
-
- you're probably right on that, and it's a good point.
-
- Now we simply have goal-setting, perception of the current state,
- comparison with the goal, and action that reduces the error. That I
- understand. What I don't get are all these nodes and arcs and that
- stuff, which sounds like the innards of a computer program, not
- something happening with someone doing it. chacun a son gout.
-
- oh, absolutely. can you see that that's exactly my reaction when
- y'all get into the details of reference signals etc. and all that
- math? in both cases, the theories and their models are disjoint, and
- it's an enormous act of faith (or science?!) to maintain the belief
- that they have anything to do w/ each other.
-
-
- cheers.
-
- --penni
-