Purpose : To study aimed to quantitatively characterize in the electroencephalogram (EEG) changes induced by head-mounted display virtual reality (HMD-VR) and to exame the association between VR-related EEG changes and motion sickness susceptibility, assessed using the Motion Sickness Susceptibility Questionanaire (MSSQ), better understand cybersickness. Methods : Resting-state EEG was recorded from 11 adult women before and after VR use using a DSI-24, dry electrode headset. Motion sickness susceptibility was measured through the Motion Sickness Susceptibility Questionnaire (MSSQ) survey. EEG signals from 19 channels were processed to obtain relative power across nine frequency bands, and were analyzed using the Wilcoxon signed-R\rank Test, Spearman’s correlation analysis, and Mann-Whitney U Test. Results : After VR use, relative theta power (RT) decreased while attention-related indices (RST, RMT, RSMT) increased, particularly in the occipital lobe. Correlation analysis revealed significant association between MSSQ scores and EEG signals in the temporal lobe (T6) and parietal lobe (Pz) regions. The high susceptibility group showed a significant decrease in parietal beta-band relative power (RLB, RB, RMB) at (Pz, P3, and P4), whereas the low susceptibility group showed an increase (p<0.050). Conclusion : The post-VR increase in attention-related ratio indices in the occipital lobe may reflect enhanced visual stimuli processing during VR exposure. In contrast, the opposing beta-band patterns observed in the parietal lobe, support the hypothesis that sensory conflict between visual input and bodily sensations in VR contributes to cybersickness.