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Preliminary examination of chromatic flicker light stimulation on EEG and pupil size for observing human activity levels
| Content Provider | Semantic Scholar |
|---|---|
| Author | Nowak, Wioletta Nakayama, Minoru |
| Copyright Year | 2009 |
| Abstract | The effectiveness and simplicity of measuring EEGs and pupillometry make them very useful tools for personalized health management. Each of these signals has been tested many times, but an interesting issue seems to be to determine the relationship between them by testing them together. In this study, simultaneously recorded changes of the pupillometry and EEG signals, in response to two-color flicker stimuli was examined and compared to changes in response to single-color flicker stimuli and to a control condition without flicker stimulation. In this experiment we used red and blue colors because they have been found most effective in producing pupil responses to light, when the recently discovered activity mechanism of melanopsin is taken into consideration. The sensitivity of EEG and pupillometry spectra to flicker stimuli parameters was tested. The results which were obtained confirm the sensitivity of EEG and pupillometry to both the color and the frequency of flicker stimuli. Two-color flicker stimuli consistently produced the greatest responses. Stimuli using red-light shows longer activity areas across pupillometry power spectra than using blue-light stimuli. The values and tendency for alpha and beta rhythms for blue and red flicker stimuli are different. On the basis of our preliminary results we can conclude that flicker stimuli with long wavelengths and small frequencies can produce the most sensitivity in tests which simultaneously record pupillometry and EEG responses. The results provide some new insight into the behaviour of the pupil and the brain in respect to flicker stimuli, but further experiments and analysis are needed to conclusively establish the proposed hypothesis. |
| Starting Page | 48 |
| Ending Page | 52 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.wseas.us/e-library/conferences/2009/prague/MCBC/MCBC06.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
