Exact localization of equivalent current dipoles (ECD) was obtained by combining the EEG and the MRI mapping allowing to trace the ECG displacement over the cortex. The data obtained corroborate localization of the alpha-rhythm ECD in the Gyrus Calcarina: the human primary visual cortex. Successive shifts of the ECD over this area during generation of each alpha-wave, were revealed. The data are discussed in the light of the "scanning hypothesis" that predicted a certain functional meaning of the alpha-wave spreading for cortical processing of sensory information.
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