For safety reasons, in-vehicle dialogue systems should be able to take the cognitive load of the driver into consideration. However, it is important to distinguish between two types of cognitive load, namely if the cognitive load is affecting the driving behaviour or not. We will present findings from a data collection carried out in the DICO project 1 , where the dialogue behaviour under high cognitive load is analysed, and present a novel theory of how to distinguish between different types of workload.
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