Alpha waves--artifacts?

Kennedy has argued that alpha rhythm recordings are artifacts caused by the mechanical pulsation (choroid plexus "pump") of a gel (the living brain) with different electrical potentials. This paper has been republished in a recent collection by Evans and Robertson. Kennedy's hypothesis seemed insufficiently supported, and contradicted the consensus concerning the origin of alpha waves which existed at the time. Significant recent research is examined which provides strong, if not conclusive, evidence that alpha waves represent a basic cellular process probably related to excitability. It is suggested that Kennedy's phenomenon be explored further to clarify any effect it may have on standard EEC recordings.