In-vehicle spoken dialogue systems are gaining increased interest by the automotive industry. They enable the driver to perform secondary tasks (i.e. tasks not related to driving the vehicle) without having to take her eyes off the road or her hands from the steering wheel. Dialogue systems also enable the driver to speak in a natural way, without having to memorize commands or navigate through a menu structure. It is however crucial to take the cognitive load of the driver into consideration, in order to be able to adapt the dialogue system accordingly. This paper presents a user study where spoken dialogues between drivers and passengers have been analysed to find out how spontaneous speech is affected by driving and carrying out other activities that increase the cognitive load of the user. The results indicate systematic changes in specific disfluency rates as the cognitive load increases.
Bibliographic reference. Lindström, Anders / Villing, Jessica / Larsson, Staffan / Seward, Alexander / Åberg, Nina / Holtelius, Cecilia (2008): "The effect of cognitive load on disfluencies during in-vehicle spoken dialogue", In INTERSPEECH-2008, 1196-1199.