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. 2024 Apr 2;29(7):1584.
doi: 10.3390/molecules29071584.

Study on the Effect of Dalbergia pinnata (Lour.) Prain Essential Oil on Electroencephalography upon Stimulation with Different Auditory Effects

Xin He  1 , Sheng Qin  1 , Genfa Yu  1 , Songxing Zhang  1 , Fengping Yi  1
Affiliations

Study on the Effect of Dalbergia pinnata (Lour.) Prain Essential Oil on Electroencephalography upon Stimulation with Different Auditory Effects

Xin He et al. Molecules. .

Abstract

Dalbergia pinnata (Lour.) Prain (D. pinnata) is a valuable medicinal plant, and its volatile parts have a pleasant aroma. In recent years, there have been a large number of studies investigating the effect of aroma on human performance. However, the effect of the aroma of D. pinnata on human psychophysiological activity has not been reported. Few reports have been made about the effects of aroma and sound on human electroencephalographic (EEG) activity. This study aimed to investigate the effects of D. pinnata essential oil in EEG activity response to various auditory stimuli. In the EEG study, 30 healthy volunteers (15 men and 15 women) participated. The electroencephalogram changes of participants during the essential oil (EO) of D. pinnata inhalation under white noise, pink noise and traffic noise stimulations were recorded. EEG data from 30 electrodes placed on the scalp were analyzed according to the international 10-20 system. The EO of D. pinnata had various effects on the brain when subjected to different auditory stimuli. In EEG studies, delta waves increased by 20% in noiseless and white noise environments, a change that may aid sleep and relaxation. In the presence of pink noise and traffic noise, alpha and delta wave activity (frontal pole and frontal lobe) increased markedly when inhaling the EO of D. pinnata, a change that may help reduce anxiety. When inhaling the EO of D. pinnata with different auditory stimuli, women are more likely to relax and get sleepy compared to men.

Keywords: Dalbergia pinnata (Lour.) Prain; audio stimulation; electroencephalograph; essential oil; inhalation.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
EEG spectra before and after inhalation of essential oils. Using the FFT in EEGLAB v2023.0 software (University of California, San Diego, available form http://www.sccn.ucsd.edu/eeglab/, accessed on 25 June 2023), the brain activity of 30 subjects in the same microscopic state was summarized. (A) Silent environment; (B) White noise; (C) Pink noise; (D) Traffic noise. When essential oils are inhaled, there are significant changes in each area.
Figure 2
Figure 2
Comparison chart of each group of single-channel analyses. (A) Silent environment; (B) White noise; (C) Pink noise; (D) Traffic noise (p-values: * < 0.05).
Figure 2
Figure 2
Comparison chart of each group of single-channel analyses. (A) Silent environment; (B) White noise; (C) Pink noise; (D) Traffic noise (p-values: * < 0.05).
Figure 3
Figure 3
Effect of essential oils on Fp, F, P, and O regions under different auditory stimuli. (A) Silent environment; (B) White noise; (C) Pink noise; (D) Traffic noise (p-values: * < 0.05).
Figure 3
Figure 3
Effect of essential oils on Fp, F, P, and O regions under different auditory stimuli. (A) Silent environment; (B) White noise; (C) Pink noise; (D) Traffic noise (p-values: * < 0.05).
Figure 4
Figure 4
Description of the data-collection process.
Figure 5
Figure 5
Experimental time design.
See this image and copyright information in PMC

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