Shopping in immersive virtual reality: Effects of visual, auditory, and cognitive demands on mental workload
研究了沉浸式虚拟现实购物任务中，视觉、听觉和认知需求对用户心理工作负荷的影响，发现认知需求（如心算）比视觉或听觉干扰更显著增加负荷，对VR体验设计有参考价值。
INTRODUCTION: Immersive virtual reality applications are increasingly popular in entertainment, education, and professional training. While many aim for maximal realism, simplifying the virtual environment may offer benefits such as reducing mental workload and improving focus on core tasks. However, the impact of different types of demand on users' mental workload remains unclear. OBJECTIVE: This study explored the impact of visual, auditory, and cognitive demands on users' mental workload during a daily living activity in immersive virtual reality. METHODS: Twenty-four participants used a head-mounted display for a virtual shopping task, i.e., picking ten listed products from a shelf, under different conditions: visual demands (moving characters), auditory demands (background noise), cognitive demands (simultaneous arithmetic task), and a combination of all three. Mental workload measures included heart rate, pupil diameter, and self-reported mental demand & effort. RESULTS: The cognitively demanding secondary task induced the largest mental workload, significantly exceeding that of auditory and visual demands. For example, on a scale of 1 (low) to 10 (high), self-reported mental demand & effort was 4.40 for the moving characters, 5.00 for the background noise, 6.67 for the arithmetic task, and 7.17 for the combined condition. Biosignal differences were consistent within participants but were masked by high inter-individual variability. CONCLUSIONS: In virtual shopping tasks, reducing enforced cognitive demands may be more effective for decreasing mental workload than reducing non-task-relevant visual or auditory demands.