AI Article Synopsis
- The study examined how rapid changes in brain activity (measured by EEG) relate to changes in perception when viewing an alternating dot pattern that creates illusory motion.
- Researchers found that about 750 milliseconds before the perceived change in motion direction, the brain's complexity decreased and certain EEG patterns became less common, while 300 milliseconds before the change, the complexity increased and the EEG patterns returned to baseline levels.
- These findings suggest that brief fluctuations in brain activity may correspond with changes in awareness and perception, indicating that moments of altered perception (like illusory motion) happen during short dips in arousal, followed by a state of higher arousal.
Article Abstract
This study explored transient changes in EEG microstates and spatial Omega complexity associated with changes in multistable perception. 21-channel EEG was recorded from 13 healthy subjects viewing an alternating dot pattern that induced illusory motion with ambiguous direction. Baseline epochs with stable motion direction were compared to epochs immediately preceding stimuli that were perceived with changed motion direction ('reference stimuli'). About 750 ms before reference stimuli, Omega complexity decreased as compared to baseline, and two of four classes of EEG microstates changed their probability of occurrence. About 300 ms before reference stimuli, Omega complexity increased and the previous deviations of EEG microstates were reversed. Given earlier results on Omega complexity and microstates, these sub-second EEG changes might parallel longer-lasting fluctuations in vigilance. Assumedly, the discontinuities of illusory motion thus occur during sub-second dips in arousal, and the following reconstruction of the illusion coincides with a state of relative over-arousal.
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| http://dx.doi.org/10.1007/s00702-004-0194-z | DOI Listing |
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