Unit 4 Code Description There are only a couple of new commands used in the models for this unit and one of them, set-all-base-levels, was discussed in the unit text. So there is not really much of anything new to discuss about the functions used to run the models, but there is a different approach […]
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ACT-R Tutorial 18-Feb-19 Unit Six Unit 6: Selecting Productions on the Basis of Their Utilities and Learning these Utilities Occasionally, we have had cause to set parameters of productions so that one production will be preferred over another in the conflict resolution process. Now we will examine how production utilities are computed and used in
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ACT-R Tutorial 18-Feb-19 Unit Seven Unit 7: Production Rule Learning In this unit we will discuss how new production rules are learned. As we will see, a model can acquire new production rules by collapsing two production rules that apply in succession into a single rule. Through this process the model will transform knowledge that
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Multiple Models • More than one model can be defined – Define-model – Clear-all removes all models • All models run when ACT-R runs – same clock • Each is independent of the others – Only share the clock Differences in output • Models are indicated in warnings and the trace > (load “ACT-R:examples;unit-1-together-1-mp.lisp”) ;
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Debugging a Model Which Has Perceptual and Motor Components In this text we are going to implement a model which can perform a simple experiment which requires visual and motor actions. While doing so we will encounter some problems which we will walk through debugging. We will also discuss some of the additional things that
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ACT-R Tutorial 18-Feb-19 Unit Three Unit 3: Attention This unit is concerned with developing a better understanding of how perceptual attention works in ACT-R, particularly as it is concerned with visual attention. 3.1 Visual Locations When a visual display such as this is presented to ACT-R VNTZ CRYK WJGF a representation of all the visual
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ACT-R Tutorial 18-Feb-19 Unit Two Unit 2: Perception and Motor Actions in ACT-R 2.1 ACT-R Interacting with the World This unit will introduce some of the mechanisms which allow ACT-R to interact with the world, which for the purposes of the tutorial will be experiments presented via the computer. This is made possible with the
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Tracker Module The tracker module provides the model with a system that is able to estimate the best value for a quantity based on one or two feedback signals, a ¡°good¡± result and a ¡°bad¡± result, which may be noisy, have different weights, and which may not be directly associable to the actions which caused
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ACT-R Tutorial 18-Feb-19 Unit One Unit 1: Introduction to ACT-R ACT-R is a cognitive architecture. It is a theory of the structure of the brain at a level of abstraction that explains how it achieves human cognition. That theory is instantiated in the ACT-R software which allows one to create models which may be used
ACT-R Model Writing This text and the corresponding texts in other units of the tutorial are included to help introduce cognitive modelers to the process of writing, testing, and debugging ACT-R models. Unlike the main tutorial units which cover the theory and use of ACT-R, these documents will cover issues related to using ACT-R from
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