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M. H. Chignell

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Publications by M. H. Chignell (bibliography)

1993

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Hancock, P. A. and Chignell, M. H. (1993): Adaptive Function Allocation by Intelligent Interfaces. In: Gray, Wayne D., Hefley, William and Murray, Dianne (eds.) International Workshop on Intelligent User Interfaces 1993 January 4-7, 1993, Orlando, Florida, USA. pp. 227-229.

“Intelligent interfaces act as translational intermediaries between humans and machines while themselves representing a third component in the human-interface-machine triad. They seek to maximize the collaborative capabilities of human and machine through the communication of mutual queries and actions in symbols best suited to the respective entity involved. This triad is directed to the achievement of a range of external goals. Attainment of such goals is best served by the enhancement of mutual adaptive capability of the individual components of the human-interface-machine triad and of the triad itself as a supraordinate unit. Within collective action, the question of who does what, when and with whom is best seen as a problem in adaptive allocation. This question is itself a subset of the general problem of function allocation which is arguably the foundation of human-machine interaction. This work advocates modular customization of the intelligent interface as a solution to the impasse that derives from previous and failed descriptive approaches to the allocation question.”

1990

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Hancock, P. A., Chignell, M. H. and Vercruyssen, M. (1990): Predicting the Effects of Stress on Performance. In: D., Woods, and E., Roth, (eds.) Proceedings of the Human Factors Society 34th Annual Meeting 1990, Santa Monica, USA. pp. 1081-1085.

“N/R”

1989

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Hancock, P. A., Chignell, M. H., Vercruyssen, M. and Denhoff, M. (1989): Experimental Evaluations of a Model of Mental Workload. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 1233-1237.

“The present experiments were designed to test predictions from a model of mental workload. The model predicts non-linear increases in mental workload as perceived distance from a task goal grows and effective time for action is reduced. Diminuation of mental workload is achieved by application of effort which brings the task goal into the region of acceptable time/distance constraints for successful resolution. Two experiments are reported which tested these assertions using the timepools performance task. Timepools is unique as a performance task in that it generates a spatial representation of a shrinking temporal target. The independent effects of path length, i.e., the number of sequential targets to be acquired, and shrink rate, i.e., the collapse time during which the circle is halved in are, may be assessed using performance variables such as reaction time (RT), movement time (MT), error rate (E), and the subjective perception of workload. Dat from Experiment 1, indicate systematic effects for task related factors across performance and workload measures, although such a pattern was not isomorphically mapped to the a priori assumed difficulty of the task. In Experiment 2, shrink rate and path length had independent effect on RT and MT respectively, which were reflected in components of the individual workload scales. The ramifications with respect to the model are elaborated.”

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