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Mental workload can be assessed via neurophysiological markers. Temporal features such as event related  potentials (ERPs) are one of those which are very often described in the literature. However, most of the  studies that evaluate their sensitivity to workload use secondary tasks. Yet potentials elicited by ignored  stimuli could provide mental state monitoring systems with less intrusive probing methods. For instance,  auditory probing systems could be used in adaptive driving or e-learning applications. This study evaluates  how workload influences auditory evoked potentials (AEPs) elicited by a single-stimulus paradigm when  probes are to be ignored. Ten participants performed a Sternberg memory task on a touchpad with three  levels of difficulty plus a view-only condition. In addition, they performed two ecological tasks of their  choice, one deemed easy (e.g. reading novels), and the other difficult (e.g. programming). AEPs were  elicited thanks to pure tones presented during the memory task retention period, and during the whole extent  of the external tasks. Performance and AEPs were recorded and analyzed. Participantsâ accuracy decreased  linearly with increasing workload, whereas the difference in amplitude between the P3 and its adjacent  components, N2 and SW, increased. This reveals the relevance of this triphasic sequence for mental  workload assessment.

Influence of Workload on Auditory Evoked Potentials in a Single-stimulus Paradigm