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

[ben.willems at faa.gov]

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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