Michael D. Byrne

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Adaptive control of thought-rational (ACT-R; J. R. Anderson & C. Lebiere, 1998) has evolved into a theory that consists of multiple modules but also explains how these modules are integrated to produce coherent cognition. The perceptual-motor modules, the goal module, and the declarative memory module are presented as examples of specialized systems in(More)
Understanding the interaction of a user with a designed device such as a GUI requires clear understanding of three components: the cognitive, perceptual and motor capabilities of the user, the task to be accomplished and the artefact used to accomplish the task. Computational modeling systems which enable serious consideration of all these constraints have(More)
Systematic errors in performance are an important aspect of human behavior that have not received adequate explanation. One such systematic error is termed postcompletion error: a typical example is leaving one’s card in the automatic teller after withdrawing cash. This type of error seems to occur when people have an extra step to perform in a procedure(More)
The authors describe ACT-R/perceptual-motor (ACT-R/PM), an integrated theory of cognition, perception, and action that consists of the ACT-R production system and a set of perceptual-motor modules. Each module (including cognition) is essentially serial, but modules run in parallel with one another. ACT-R/PM can model simple dual tasks such as the(More)
We conducted two experiments designed to examine whether animations of algorithms would help students learn the algorithms more effectively. Across the two studies we used two different algorithms--depth-first search and binomial heaps--and used two different subject populations-students with little or no computer science background and students who were(More)
A prerequisite to the effective design of user interfaces is anunderstanding of the tasks for which that interface will actuallybe used. Surprisingly little task analysis has appeared for one ofthe most discussed and fastest-growing computer applications,browsing the World-Wide Web (WWW). Based on naturally-collectedverbal protocol data, we present a(More)
Users faced with Web sites containing many possibly relevant pages often have a decision to make about navigation: use the menu of links or use the provided site search function. Two studies were conducted to examine what users do when faced with this decision on e-commerce Web sites, and how users go about deciding which method to attempt. An exploratory(More)
A common task at almost any computer interface is that of searching for documents, which GUIs typically represent with icons. Oddly, little research has been done on the processes underlying icon search. This paper outlines the factors involved in icon search and proposes a model of the process. An experiment was conducted which suggests that the proposed(More)
OBJECTIVE To replicate a successful laboratory slip-class error paradigm and, more importantly, to further understand the underlying causes of errors made in that paradigm. BACKGROUND Routine procedural errors are facts of everyday life but have received limited controlled empirical study, despite the sometimes severe consequences associated with such(More)