Physiological metrics of mental workload: A review of recent progress

Abstract : This report reviews research on physiological metrics of mental workload performed in the last decade. The focus of the review is on measurement techniques that have potential for fundamental explanation of mental workload and for use in operational environments. The techniques are examined within a framework of measurement criteria. These criteria include: sensitivity, diagnosticity, intrusiveness, reliability, and generality of application. Over 200 articles are covered by the review. Measures reviewed include: electroencephalograms, event-related potentials, magnetoencephalograms, positron emission tomography, electro-oculograms, cardiovascular measures, pupillometry, respiratory measures, and electrodetmal measures. Keywords: Mental workload, Physiological metrics, Electroencephalogram, Magnetoencephalogram, Cardiovascular function, Pupillometry, Respiration, Electrodermal responses.