Abstract
During a number of experiments with the helical scan toposcope, certain characteristic features were noted concerning the spatial and temporal distribution of the alpha rhythm. In particular, two main categories of anteroposterior, spatio-temporal distribution were distinguished, one in which the instant of maximal amplitude of alpha waves became progressively later or earlier according to the proximity of the recording electrodes to the occiput, the other in which maximal amplitude occurred simultaneously in all channels, usually with a change of sign over the occipital areas. Exact interhemispheric synchrony was rare. These and several subsidiary features of the alpha rhythm were discussed, and a number of hypotheses put forward in an attempt to provide an overall explanatory theory concerning the nature and generation of the alpha rhythm.
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More From: Electroencephalography and Clinical Neurophysiology
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