L'ANNÉE PSYCHOLOGIQUE, 2000, 100, 629-660 Copyright © 2000. Presses Universitaires de France VITESSE DU PROCESSUS ET TEMPS PARTAGÉ : planification et concurrence attentionnelle

This experiment, carried out on a dynamic microworld described to the subjects as the command of units fighting against forest fires, reproduces the results of a previous experiment (Hoc & Moulin, 1994), which have shown a stability in performance between a high and a low process speed. By interposing a medium speed between the two extreme speeds, the present experiment shows an optimum effect that provides us with more evidence in favour of a strategy shift. Performance stability can be interpreted as the result of shifting from a reactive strategy to an anticipative one progressively reaching the subjects' competency limit. On the other hand, by introducing conditions of time-sharing task management (several fires), a progressive improvement in performance is shown in relation to the reduction of attentional concurrence at the planning step.

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