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Cognitive workload of in-car auditory-vocal interfaces on visuospatial sketchpad based on a dual task of visual pattern test

The goal of this study is to quantify the cognitive workload of visuospatial components on operating voice-based interfaces. Particularly, we aim to quantify the user's visuospatial workload when they operate voice commands while driving and, then, comparing the reported workload that participants simultaneously used graphical interfaces. We used the quantitative measurement method to evaluate the workload on the visuospatial sketchpad by employing a dual task of pattern span test and usage of a target interface. The results indicated that even voice command interfaces affect the performance of the pattern span test regardless of the independence of the sketchpad and the phonological loop. Also, we quantitatively found that employing familiar words and their combinations for drivers could reduce the workload of voice-based operations.