Mental fatigue and working memory load estimation: Interaction and implications for EEG-based passive BCI - Archive ouverte HAL
Communication Dans Un Congrès Année : 2013

Mental fatigue and working memory load estimation: Interaction and implications for EEG-based passive BCI

Résumé

Current mental state monitoring systems, a.k.a. passive brain-computer interfaces (pBCI), allow one to perform a real-time assessment of an operator's cognitive state. In EEG-based systems, typical measurements for workload level assessment are band power estimates in several frequency bands. Mental fatigue, arising from growing time-on-task (TOT), can significantly affect the distribution of these band power features. However, the impact of mental fatigue on workload (WKL) assessment has not yet been evaluated. With this paper we intend to help fill in this lack of knowledge by analyzing the influence of WKL and TOT on EEG band power features, as well as their interaction and its impact on classification performance. Twenty participants underwent an experiment that modulated both their WKL (low/high) and time spent on the task (short/long). Statistical analyses were performed on the EEG signals, behavioral and subjective data. They revealed opposite changes in alpha power distribution between WKL and TOT conditions, as well as a decrease in WKL level discriminability with increasing TOT in both number of statistical differences in band power and classification performance. Implications for pBCI systems and experimental protocol design are discussed.
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Dates et versions

hal-00862975 , version 1 (18-09-2013)

Identifiants

Citer

Raphaelle N. Roy, Stéphane Bonnet, Sylvie Charbonnier, Aurélie Campagne. Mental fatigue and working memory load estimation: Interaction and implications for EEG-based passive BCI. EMBC 2013 - 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Jul 2013, Osaka, Japan. pp.6607-6610, ⟨10.1109/EMBC.2013.6611070⟩. ⟨hal-00862975⟩
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