A Comparison of Random and Sinusoidal Vibration Effect on Human Alertness Level
DOI: 10.14419/ijet.v7i4.38.29227
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Summary
This study investigates the impact of whole-body vibration (WBV) on human alertness, addressing a gap in research regarding how vehicle vibrations affect seated drivers' mental state. While drowsiness is a significant cause of road accidents, prior studies have largely focused on physical fatigue rather than the cognitive effects of vibration. The researchers aimed to establish a quantitative link between WBV and drowsiness by comparing the effects of random and sinusoidal vibrations against a no-vibration control condition. The experimental design involved ten healthy male university students who served as volunteers. Participants were seated in a custom-built motion-base vibration simulator equipped with an industry-standard car seat. The study utilized three conditions: no vibration (NVC), random vibration (RVC), and sinusoidal vibration (SVC). All vibration conditions were set to a frequency range of 1–15 Hz and an acceleration level of 0.3 m/s² r.m.s., consistent with ISO 2631-1 standards for perceived vibration. Each condition lasted for 20 minutes. Electroencephalographic (EEG) signals were recorded using a 14-channel wireless headset to monitor brainwave activity, specifically focusing on theta waves (4–7.5 Hz), associated with drowsiness, and beta waves (14–30.5 Hz), associated with alertness. Data were analyzed using EEGLAB software and Fast Fourier Transform algorithms, with statistical significance determined at p < 0.05. The results demonstrated a significant correlation between WBV exposure and increased drowsiness. In both RVC and SVC conditions, there was a statistically significant drop in beta activity and a rise in theta activity compared to the NVC condition, indicating a reduction in alertness. Specifically, sinusoidal vibration caused a more pronounced decrease in beta activity than random vibration, suggesting it has a stronger effect on diminishing wakefulness. Conversely, the NVC condition showed a rise in beta activity, confirming that participants remained fully awake without vibration exposure. The data confirmed that even low-frequency vibrations deemed safe by international standards can induce drowsiness in seated individuals. The study concludes that WBV, particularly sinusoidal vibration, significantly impairs driver alertness by altering brainwave patterns associated with wakefulness. These findings imply that current safety standards, such as ISO 2631-1, may need revision to account for cognitive fatigue and drowsiness, not just physical discomfort. The authors recommend further research into the relationship between vibration and mental state to develop better models for assessing driver safety and reducing accident rates caused by vibration-induced drowsiness.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-20 |
| archive | success | canonical_url | — | — | 1 | 2026-06-26 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-21 |
| chunk | success | chunk | — | — | 1 | 2026-06-21 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-21 |
| promote | success | — | — | — | 1 | 2026-06-20 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-25 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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- Empirical Findings: physiological data