Figure 4

![Figure 4: Individual participant responses to essential oil aroma stimulation during sleep show variability in slow-wave EEG enhancement. Most subjects demonstrate increased delta activity, though the magnitude differs.](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7806966/bin/41598_2020_80171_Fig4a_HTML.jpg)

> Source: Li-Wei Ko et al. "A pilot study on essential oil aroma stimulation for enhancing slow-wave EEG in ." *Scientific reports*, 2021. PMID: [33441798](https://pubmed.ncbi.nlm.nih.gov/33441798/)

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  <img src="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7806966/bin/41598_2020_80171_Fig4a_HTML.jpg" alt="Individual participant responses to essential oil aroma stimulation during sleep show variability in slow-wave EEG enhancement. Most subjects demonstrate increased delta activity, though the magnitude differs." />
  <figcaption>Figure 4. Individual participant responses to essential oil aroma stimulation during sleep show variability in slow-wave EEG enhancement. Most subjects demonstrate increased delta activity, though the magnitude differs.<br>  Source: Li-Wei Ko et al. "A pilot study on essential oil aroma stimulation for enhancing slow-wave EEG in ." <em>Scientific reports</em>, 2021. PMID: <a href="https://pubmed.ncbi.nlm.nih.gov/33441798/">33441798</a></figcaption>
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