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Recherche d’indicateurs électrodermaux pour l’analyse de la charge mentale en conduite automobile

Abstract : As an assessment tool for individual’s functional state, autonomic indices can help improving our knowledge of drivers’ behaviour, which is a central road safety causal factor. This work is focused on driver’s mental workload assessment, relying on electrodermal activity analysis. This is an attempt to highlight the most reliable electrodermal indices with the aim to distinguish accurately mental workload elicited by actual driving situations. The analysis of about thirty phasic indices, led to differentiate nominal driving situations. These were selected on the basis of comparable behavioural requirements, but of differences cognitive processes. After appropriate signal processing, (using log transformations in particular), electrodermal responses amplitude has the most potential to distinguish among experimental conditions. However, some of the differences about mental workload were not exactly those which were previously expected. An alternative interpretation of results highlighting anticipation processes is thus proposed. Tonic variations were then studied in a dual task experiment, including two new indices. The distractive power of several secondary tasks, performed while driving, was to be evaluated using these indices. One of the indices was unrelated to signals’ profile. Conversely, the two others gave a clear distinction of potential distraction elicited selectively by each secondary task. Mental workload was thus showed as being evaluated accurately using electrodermal activity analysis. Using objective physiological data and defining new electrodermal indices brought more reliability in the field of mental workload. Thus, electrodermal activity is a good candidate to complete data usually brought by tests or questionnaires.
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Antoine Clarion. Recherche d’indicateurs électrodermaux pour l’analyse de la charge mentale en conduite automobile. Autre. Université Claude Bernard - Lyon I, 2009. Français. ⟨NNT : 2009LYO10250⟩. ⟨tel-00496828⟩

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