Journal article

Assessment of mental workload: A new electrophysiological method based on intra-block averaging of ERP amplitudes

  • Horat, Sibylle K. Unit of Psychiatric Neuroscience and Psychotherapy, Department of Medicine, University of Fribourg, Switzerland
  • Herrmann, François R. Department of Rehabilitation and Geriatrics, University Hospitals of Geneva, Switzerland
  • Favre, Grégoire Mental Health Network Fribourg (RFSM), Marsens, Switzerland
  • Terzis, Jorge HELIOS Privatkliniken GmbH – Wuppertal-Universität/Barmen, Wuppertal, Germany - Department of Neurosurgery, Universität Kliniken der Stadt Köln, Germany
  • Debatisse, Damien HELIOS Privatkliniken GmbH – Wuppertal-Universität/Barmen, Wuppertal, Germany - Department of Neurosurgery, Universität Kliniken der Stadt Köln, Germany
  • Merlo, Marco C. G. Unit of Psychiatric Neuroscience and Psychotherapy, Department of Medicine, University of Fribourg, Switzerland
  • Missonnier, Pascal Unit of Psychiatric Neuroscience and Psychotherapy, Department of Medicine, University of Fribourg, Switzerland - Mental Health Network Fribourg (RFSM), Marsens, Switzerland
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    25.12.2015
Published in:
  • Neuropsychologia. - 2016, vol. 82, p. 11–17
English The present study contributes to the current debate about electrophysiological measurements of mental workload. Specifically, the allocation of attentional resources during different complexity levels of tasks and its changes over time are of great interest. Therefore, we investigated mental workload using tasks varying in difficulty during an auditory oddball target paradigm. For data analysis, we applied a novel method to compute event-related potentials (ERPs) by intra-block epoch averaging of P2, P3a and P3b amplitude components for the infrequent target stimuli. We obtained eight consecutive blocks of 5 epochs each, which allowed us to develop an electrophysiological parameter to measure mental workload. In both the easy and the more constraining tasks, the amplitude of P2 decreased beginning with the second block of the sequence. In contrast, the amplitudes of P3a and P3b components linearly decreased following the repetition of the target in the more constraining task, but not in the easy task. Statistical analysis revealed intra-block differences on amplitudes of ERPs of interest between the easy and the more constraining tasks, confirming this method as a measure to assess mental workload. Since a subject is his own control, the present method represents an electrophysiological parameter for individual measurement of mental workload and may therefore be applicable in clinical routine.
Faculty
Faculté des sciences et de médecine
Department
Médecine 3ème année
Language
  • English
Classification
Psychology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/305075
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