oscillations in the gamma and alpha range respond differently to spatial frequency. Fründ, I., Busch, N. A., Körner, U., Schadow, J., & Herrmann, C. S. Vision Res, 47(15):2086--2098, July, 2007.
 oscillations in the gamma and alpha range respond differently to spatial frequency [pdf]Paper  doi  abstract   bibtex   
Physical properties of visual stimuli affect electrophysiological markers of perception. One important stimulus property is spatial frequency (SF). Therefore, we studied the influence of SF on human alpha (8-13 Hz) and gamma (\textgreater30 Hz) electroencephalographic (EEG) responses in a choice reaction task. Since real world images contain multiple SFs, an SF mixture was also examined. Event related potentials were modulated by SF around 80 and 300 ms. Evoked gamma responses were strongest for the low SF and the mixture stimulus; alpha responses were strongest for high SFs. The results link evoked and induced alpha and evoked gamma responses in human EEG to different modes of stimulus processing.

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