home *** CD-ROM | disk | FTP | other *** search
- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!paladin.american.edu!auvm!PARC.XEROX.COM!SIBUN
- X-Delivery-Notice: SMTP MAIL FROM does not correspond to sender.
- Fake-Sender: sibun@parc.xerox.com
- Message-ID: <92Aug17.163556pdt.29192@hmmm.parc.xerox.com>
- Newsgroups: bit.listserv.csg-l
- Date: Mon, 17 Aug 1992 16:35:54 PDT
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- From: Penni Sibun <sibun@PARC.XEROX.COM>
- Subject: Re: separating action and perception
- X-To: CSG-L%UIUCVMD.BITNET@pucc.princeton.edu
- In-Reply-To: "William T. Powers"'s message of Mon,
- 17 Aug 1992 11:40:24 -0700
- <92Aug17.114920pdt.11583@alpha.xerox.com>
- Lines: 37
-
- (penni sibun 920817)
-
- [From Bill Powers (920817.1130)]
-
-
- The point I was making to Penni Sibun concerned the relationship between
- the driver's actions (applying torques to the steering wheel) and the
- perceptions that are controlled as a result (the observed position of the
- car on the road, as the driver sees it). In some of the materials Penni
- cited, the statement appears that action and perception are inseparable.
- But when there are independent variables in the environment which have just
- as much influence on the outcome as the actions do, it is the outcome that
- remains the same, while the actions vary to oppose the effects of those
- independent variables. So the perception (of the car's position) remains
- essentially stable, but the actions (torques applied to the steering wheel)
- vary as the independent variables in the environment vary.
-
- perhaps you're eliding something here, but you seem to be saying:
- there's a picture (or encoding thereof) in the head of how the
- road/hood is supposed to look. perception is the driver getting an
- unambiguous (and undecomposable?) signal through his eyes, without his
- having to do any work to get it. there's just tons of literature on
- perception that suggest that perc. is a *lot* of work; in fact it
- involves action--perhaps to the degree that p. and a. are inseparable.
- (``active vision'' is a current buzzphrase.) if i'm driving into the
- sun, i'll have to squint to see anything. if it's sleeting, i'll have
- to peer around the bouncing balls of ice and the flailing wipers. at
- *any* time, my eyes are having to track the road, since the car is
- constantly bouncing me around. i don't in fact ``see'' everything in
- front of me the same way; my attention is focused.
-
- it also seems that you assume a one-step comparison process bet. the
- perception and the reference, but you don't explain how it might work.
-
- cheers.
-
- --penni
-