[ACT-R-users] Production satiation (UNCLASSIFIED)

[Kelley, Troy (Civ,ARL/HRED)]

Classification:  UNCLASSIFIED 
Caveats: NONE

Yes, I was wondering about production utility as being an answer.  I
have never used it much.  I also assumed that the production utility
would continue to increase if the production was still firing, even if
the rewards were small.  I didn't realize the production utility would
decrease if the rewards were small and it fires in a sequence of
productions.  I need to look at the production utility equation again. 


Troy D. Kelley
US Army Research Laboratory
Human Research and Engineering Directorate
AMSRD-ARL-HR-SE
Aberdeen, MD, 21005-5425
Ph: 410-278-5869
FAX: 410-278-9523


-----Original Message-----
From: Ion Juvina [mailto:ijuvina at andrew.cmu.edu] 
Sent: Tuesday, May 15, 2007 11:47 AM
To: Kelley, Troy (Civ,ARL/HRED)
Cc: act-r-users at act-r.psy.cmu.edu
Subject: Re: [ACT-R-users] Production satiation (UNCLASSIFIED)

here is my 2 cents: a production's utility decreases when that
production fires frequently in a sequence of productions that leads to
very small rewards. so, all we need to do is make sure we have a
"competitive" production there, that is, a production that contributes
to getting higher rewards. 

example: a "ride-a-bike" production could lose the competition in favor
of a "drive" production if the environment favors speed and safety.
however, the "ride-a-bike" production can still win when the environment
favors health and losing-weight criteria. 

ion
 
  

   
  


On May 15, 2007, at 10:15 AM, Kelley, Troy ((Civ,ARL/HRED)) wrote:


	Classification:  UNCLASSIFIED 
	Caveats: NONE 
	  
	ACT-R users, 

	I was wondering, and I have never heard of this, if there a
concept of production satiation in ACT-R, or someway to implement such a
concept?  This seems to be a common problem in ACT-R where a production
will continue to fire over and over and it is difficult to stop.  I
understand that the solution is to change the activation of a chunk so
that something else will match, but this is difficult to accomplish when
the matching chunk keeps increasing in activation, thus causing more
matches.  I remember a few ACT-R workshops back that someone, I think
Richard Young, presented the idea of a production refractory period, and
I was wondering if this idea has ever gained any ground?  Or are there
other ideas of satiation within ACT-R?  I am asking this because we are
having trouble with our robot performing the same productions over and
over.  Again, I understand that we need to activate other chunks to
cause a different match, but the question is - Where does this increased
activation come from?  Is this a meta-cognitive function?  If there are
no "new" stimuli from the outside, what triggers an increase in
activation?

	Troy D. Kelley 
	US Army Research Laboratory 
	Human Research and Engineering Directorate 
	AMSRD-ARL-HR-SE 
	Aberdeen, MD, 21005-5425 
	Ph: 410-278-5869 
	FAX: 410-278-9523 


	  
	Classification:  UNCLASSIFIED 
	Caveats: NONE 

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Classification:  UNCLASSIFIED 
Caveats: NONE