## 1 Introduction
[14] probed the impacts of EA on various biosignals, with a keen focus on EEG alongside bioimpedance and electrocardiogram (ECG) responses during the stimulation of two acupuncture points on the pericardium meridian, PC5 (Jianshi) and PC6 (Neiguan). To achieve a deeper understanding of time-based changes in brain activity, a continuous wavelet transform (CWT) with a Morlet wavelet was employed, allowing for the temporal localization of changes in the EEG signal. The study reported a generalized increase in EEG amplitude across all lobes during EA stimulation. Most significantly, the temporal lobe exhibited a pronounced increase in amplitude following stimulation at the PC5 point. Additionally, during the acupuncture point stimulation periods, there was a marked elevation in the power within the alpha wave band of the EEG. These alterations in EEG patterns suggest that specific acupuncture points, such as PC5 and PC6, may have broader neurophysiological implications, significantly influencing the temporal lobe of the brain. [PERSON] et al. [15] focused on cortical activities evoked by noxious somatosensory stimulation in humans, where they found significant modulatory effects. The study utilized a 64-electrode Neuroscan ESI-128 EEG system to measure the brain electrical activity of 24 healthy subjects, focusingon somatosensory evoked potentials (SEPs) elicited by painful stimuli. The key results from the study indicated that EA at specific acupoints, as opposed to non-acupoints, leads to the emergence of a particular later-latency SEP component (P150) observed in the bilateral anterior cingulate cortex (ACC). This finding suggests that acupoint stimulation can specifically influence brain activity in regions associated with pain processing. In another related study, [PERSON] et al. (2016) investigated the effects of EA on brain waves by administering it at various frequencies and intensities to 15 healthy participants. The EA was applied at the bilateral ST36 (Zusanli) points in two modes: low frequency (2 Hz) at high intensity (5-6 mA) and high frequency (120 Hz) at low intensity (2-2.5 mA). The EEG data collected before (pre-stimulation) and during the EA stimulation using a 10-20 EEG system with eight electrodes were analyzed across theta, alpha, beta, and gamma bands using fast Fourier transformation. Statistical analysis was performed with the Wilcoxon signed-rank test, to compare EEG during EA stimulation with pre-stimulation EEG. The results indicated that high-frequency EA led to a significant decrease in theta power in most regions, an increase in alpha power in the posterior region, particularly significant at P3, and a decrease in beta and gamma power, with notable changes in the prefrontal and P4 regions, respectively. In contrast, low-frequency EA resulted in a significant decrease in theta power across all electrodes, while changes in alpha, beta, and gamma power were not significant. [PERSON] et al. (2017) analyzed theta-band phase synchronization during the application of EA at the Neiguan (PC6) and Shenmen (HT7) acupoints. Recognized for its cognitive and consciousness-correlated activities, the theta band was scrutinized under acupuncture and resting states across hemispheres in 11 healthy subjects through multivariate EEG recordings using a 128-electrode neuron scan system. The researchers employed mean phase coherence to assess the synchronization between distinct cerebral regions, specifically between the parietal (P5, PO5), frontal (FP3, Fz, FC6), and occipital (POZ) areas. Their findings revealed a pronounced increase in phase synchronization between the parietal-frontal and occipital regions during and post-acupuncture when juxtaposed with resting conditions, highlighting a potential enhancement in functional brain connectivity. Contrarily, a decrease in phase synchrony was observed within the frontal regions, suggesting a modulatory effect of acupuncture on neural communication within those areas. [PERSON] et al.