シンポジウム
A Study of Appropriate Task Stressors for Mental Stress Assessment using Biosignals
2014 年 52 巻 Supplement 号 p. SY-31-SY-32
詳細
2014 年 52 巻 Supplement 号 p. SY-31-SY-32
To stabilize mental stress assessment, we are studying quantitative measurements based on the bio-signal fluctuation triggered by a task stressor. Unfortunately, the loads imposed by most task stressors are highly user dependent. We investigate the task stressors of uncomfortable images, annoying sounds, Sudoku puzzles, and visual search tasks. Task stressor loads are quantified by subjective rating scores or by operation times. In the experiments, we extract two quantitative indices from bio-signals; LF/HF ratio from ECG/respiration and pupil diameter fluctuation. We use the correlation between the bio-signals indices and the subjective scores of mental stress (GHQ28, STAI) to evaluate task stressor repeatability. The results show that visual search tasks are the most reliable (uniform across subjects). The other tasks demand some form of user-specific adjustment. The results confirm the effectiveness of a compound index consisting of LF/HF and pupil index.
