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| Wave name | Frequency (Hz) | Typical amplitude (uV) | Meaning | Aesthetics on UX | Aesthetics on UI |
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| Delta | 0.1–4 | 100–200 | The deepest stages of sleep and support in describing the depth of sleep | Better UX evokes stronger relative power of delta (frontal region) [12]. | Delta reflects feelings of drowsiness, which can be used to evaluate the visual novelty of the UI [61, 62].
Frontal delta is related to the visual working memory, which can be used to evaluate the complexity of UI design [63]. |
| Theta | 4–8 | Higher than 30 | Interesting emotions, distraction, trance, hypnosis, and intense dreams and emotions | Better UX affects weaker relative power on the theta rhythms (frontal and parieto-occipital regions) [12].
Theta is correlated with UX on navigation and location recall, which can be considered in the virtual environment [64]. | Preferred humanoid robot appearances showed higher theta rhythm power than nonpreferred ones [65]. |
| Alpha | 8–13 | 30–50 or higher | Relaxed but aware state | Better UX evokes stronger relative power of alpha (frontocentral, parietal, and parieto-occipital regions) [12].
EEG asymmetry of the alpha frequency band is strongly associated with affective or emotional processes [66].
The alpha power varies the function in tasks related to creativity and interventions [18]. | Alpha brain waves are active when people feel stable and pleasant [51].
Alpha increased when users were in a relaxed state or showed pleasing images [12].
Posterior alpha is in charge of visual working memory, which can test the complexity of UI [63]. |
| Beta | 13–30 | 2–20 or higher | Excited state, physical activity | The beta frequency band is associated with emotions in the immersive or virtual environments [67]. | Studies reported that women showed higher beta in the anterior cingulate cortex on modelling design [68]. |
| Gamma | 30–60 | 3–5 or higher | High consciousness level, integration of different sensory modalities, awakened state | Better UX evokes stronger relative power of gamma (C3) [69]. | It is in charge of working memory of graphic UI design [70]. |
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