Cardiff Metropolitan University
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Supporting dynamic change detection: using the right tool for the task

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posted on 2022-12-16, 15:46 authored by Benoît R. Vallières, Helen Hodgetts, François Vachon, Sébastien Tremblay

 Detecting task-relevant changes in a visual scene is necessary for successfully monitoring and managing dynamic command and control situations. Change blindness—the failure to notice visual changes—is an important source of human error. Change History EXplicit (CHEX) is a tool developed to aid change detection and maintain situation awareness; and in the current study we test the generality of its ability to facilitate the detection of changes when this subtask is embedded within a broader dynamic decision-making task. A multitasking air-warfare simulation required participants to perform radar-based subtasks, for which change detection was a necessary aspect of the higher-order goal of protecting one’s own ship. In this task, however, CHEX rendered the operator even more vulnerable to attentional failures in change detection and increased perceived workload. Such support was only effective when participants performed a change detection task without concurrent subtasks. Results are interpreted in terms of the NSEEV model of attention behavior (Steelman, McCarley, & Wickens, Hum. Factors 53:142–153, 2011; J. Exp. Psychol. Appl. 19:403–419, 2013), and suggest that decision aids for use in multitasking contexts must be designed to fit within the available workload capacity of the user so that they may truly augment cognition. 


Published in

Cognitive Research: Principles and Implications




  • VoR (Version of Record)


Vallières, B.R., Hodgetts, H.M., Vachon, F. and Tremblay, S. (2016) 'Supporting dynamic change detection: using the right tool for the task', Cognitive research: principles and implications, 1(1), pp.1-20.

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Cardiff Met Affiliation

  • Cardiff School of Sport and Health Sciences

Cardiff Met Authors

Helen Hodgetts

Cardiff Met Research Centre/Group

  • Applied Psychology and Behaviour Change

Copyright Holder

  • © The Authors


  • en

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