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

Roy, Raphaëlle N. and Bonnet, Stéphane and Charbonnier, Sylvie and Campagne, Aurélie Mental fatigue and working memory load estimation: Interaction and implications for EEG-based passive BCI. (2013) In: 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 3 July 2013 - 7 July 2013 (Osaka, Japan).

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Official URL: http://dx.doi.org/10.1109/EMBC.2013.6611070

Abstract

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.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Université Grenoble Alpes - UGA (FRANCE)
Other partners > Université de Savoie Mont Blanc - USMB (FRANCE)
Laboratory name:
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Deposited By: Raphaëlle ROY
Deposited On:02 Aug 2018 15:47

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