Abstract
In the present paper, the possibilities to activate low voltage EEG in 40 neuropsychiatrie patients have been discussed. An attempt at differentiation between two pathogenic factors, anxiety and lowered vigilance has been made. To activate the LVR, the blocking response,hyperventilation, bemegride administration, photostimulation, dexphenmetrazine,meprobamate and pharmacologically induced sleep have been used in all subjects. Altogether in 75 % of records, the amplitude of ground rhythm was successfully activated. The remaining 25 % did not respond to all activating methods and low voltage persisted even during sleep. Such was the case in organic lesions of CNS, particularly in vertebrobasilar insufficiency, where LVR may represent insufficiency of synchronizing mechanisms of brain rhythms.