[ACT-R-users] Baseline activation strengthening and decay

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

That is a good question.

 

I think many times as modelers, we need to make some assumptions about
what is happening in the CONTEXT of the overall task.  So, in your
example, if you see a fixation for 1500ms, you need to make some
assumptions about what is happening in relationship to the overall task.
Does that fixation represent some critical moment in the flow of the
problem space?  Those assumptions would then guide your retrievals or
any other productions that may or may not also include retrievals.  So,
in other words, let your knowledge of the task and problem space guide
your assumptions about what is going on during the 1500ms.

 

Troy Kelley

Army Research Laboratory

Human Research and Engineering Directorate

AMSRD-ARL-HR-SE

APG, MD, 21005-5425

voice: 410-278-5859

fax: 410-278-9523

tkelley at arl.army.mil

 

  _____  

From: act-r-users-bounces at act-r.psy.cmu.edu
[mailto:act-r-users-bounces at act-r.psy.cmu.edu] On Behalf Of
ben.willems at faa.gov
Sent: Wednesday, February 15, 2006 10:31 PM
To: act-r-users at act-r.psy.cmu.edu
Subject: [ACT-R-users] Baseline activation strengthening and decay

 


Please excuse my ignorance, but I am working on the other side of the
cognitive modelers.  That is, I run simulations using human experts in
Air Traffic Control and create records of human activity quite similar
to what you call a simulation trace.  Ignoring for a moment that the
visual system may be able to process several things within the foveal
area simultaneously, how would you interpret a single 1500msec fixation
on an object in terms of number of retrievals?  Does that include a
single retrieval or does it involve cyclic retrievals with a time
constant of 50msec for the retrieval and another 50msec to push the
chunk to the goal stack?  Or do you assume that initially there is a
retrieval followed by maintaining activation at a faster cycle time?  Do
you assume that activation strengthening occurs independent of the
perceptual or motor event that triggers activation of the chunk?  E.g.,
seeing an aircraft representation vs. listening to a reference to an
aircraft or typing in an identifier for that aircraft. 

Ben Willems
Engineering Research Psychologist
William J. Hughes Technical Center
NAS Human Factors Group (ACB-220)
Building 28
Atlantic City International Airport, NJ 08405
USA
Phone:  609-485-4191
Fax:  609-485-6218
E-mail: Ben.Willems at faa.gov

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