However, the observable behaviour of the body can provide an insight in the mental state of human because of the relationship between cognition and external activities. A series of methods for workload measurement in mental work have been comprehensively applied: physiological measures, subjective questionnaires, performance or errors, and task-related body actions measure. It is obvious that each of these methods has limitations, e.g. concerning intrusiveness. Moreover, each measure can generally reflect one part of workload. Whole workload is often explained by an integration of many measures (e.g. errors and subjective questionnaire). So far, non-task-related body behaviour is used rarely as an indicator for work demands and workload. Hence, the question was examined in this work that whether body behaviour (especially non-task-related behaviour) could be a method for measurement of work demand and workload. The major objective in this work is to confirm relationships between body behaviour and workload, as well as between body behaviour and work demands in mental work settings.
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