Why the study?
The study was conducted to demonstrate the effect of verbal ratings on electroencephalogram arousal and psychomotor vigilance test performance.
Verbal ratings of sleepiness during a vigilance task can temporarily counteract dual-task interference by increasing physiological arousal, though this effect habituates over time.
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Verbal ratings may confound EEG/PVT arousal measures in vigilance testing; leaves open protocol standardization for occupational monitoring.
The aim of the present study was to demonstrate the effect of verbal ratings on arousal in the electroencephalogram (EEG) and psychomotor vigilance test (PVT) performance. Thirty participants underwent the PVT for 40 min in three experimental conditions: (1) Rating condition, in which they verbally rated subjective sleepiness with Karolinska sleepiness scale, following pure tone sound played every 20 s during PVT, (2) No-rating condition, in which they underwent PVT with the similar sound as the Rating experiment but without the verbal rating task, and (3) Control condition, in which they underwent PVT with a no-sound stimulus and without the verbal rating task. The results show that during the first half of the task epoch, alpha power density was lower in the Rating than in the No-rating condition, while performance was not different between the conditions. During the second half of the task epoch, performance was better in the Non-rating than in the Rating condition, but no difference in the alpha power density. These results suggest that performance deterioration could be masked by the arousal effect of the dual task itself. It could also explain why the PVT performance and arousal in EEG sometimes dissociate, particularly in dual task situations.
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Kaida et al. (2020) studied this question.
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