複合的トラッキング作業における「眼球停留関連電位のラムダ反応」と「聴覚P300」の比較

抄録

Abstract-Eye-fixation-related potentials (EFRPs)associated with the occurrence of fixation pause can be obtained from averaging electroencephalograms (EEGs)at the offset of saccades. A EFRP is a kind of event-related brain potential (ERP), which has a relationship with visual attention and the physical properties of visual stimulus. Auditory P300 is the ERP elicited from probe stimuli in a secondary task. The amplitude of a late positive wave (P300) is inversely proportioned to the amount of perceptual-central processing resources allocated to a primary task. In this experiment, the lambda responses of EFRPs and auditory P300 were examined concurrently with multiple tracking tasks to compare the effects of tasks of different difficulties. Eighteen participants were assigned six different types of tracking task, each for s min. The workload under each tracking condition was different in the task quality (the difficulty of perceptual-motor and/or perceptual-central levels). As a result, the peak amplitude of lambda responses decreased with the level of perceptual-motor workload, while the peak amplitude of P300 decreased with the level of both workloads. The results suggested that ERPs are a useful index of the information processing workload in human computer interaction.