[The functional significance of alpha activity in the visual cortex for the recognition of images and movement].
The idea of the EEG alpha-waves as a rhythmically spreading scanning process was tested in 27 subjects. The stimuli presentation was not synchronised with the alpha-wave phase in control. In experimental group, recognition of different-shape figures and size coincided with one of four phases of the EEG alpha-wave in occipital area. Under flicker stimulation through closed eyes with the alpha-frequency, 11 of the 12 subjects perceived distinct illusory visual objects. The optimal stimulation frequency was always within the alpha-range and closely correlated with the individual predominant alpha-frequency. The data obtained corroborate the theory that the alpha-wave in the visual cortex reflects a uniformity of the spreading scanning process which plays a major part in the process of visual recognition.
Shevelev
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D000328:Adult; D000513:Alpha Rhythm / Q000379:methods / Q000706:statistics & numerical data; D000704:Analysis of Variance; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D010775:Photic Stimulation / Q000295:instrumentation / Q000379:methods; D011603:Psychophysiology; D012016:Reference Values; D012815:Signal Processing, Computer-Assisted; D014793:Visual Cortex / Q000502:physiology*
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