[Importance of EEG studies in the assessment of hearing and equilibrium disorders of central origin].

In a group of 52 patients with hearing and equilibrium disturbances of central origin EEG was done. The obtained EEG findings were correlated with: a) main clinical manifestations of the type of function loss or stimulation, and b) disturbances of behavioural perception, that is specific signs of disturbed perception and non-specific extraperceptive signs. Disturbed hearing, independently of the side of lesion, was accompanied by focal disturbances of electrogenesis in left temporal leads. Vertigo was associated as a rule with focal pathological changes in parieto-occipital leads bilaterally, prevailing in the right-side leads. The pattern of labyrinthine (static) behavioural disturbances was, as a rule, more rich than that of hearing behaviour disturbances. The differences observed in clinical pattern were explained as due to differences in the neurophysiological properties of the temporal and parieto-occipital cortex. Conclusions were based on the hypothesis of minimal brain damage and dipolar organization of the pathological bioelectric function of the brain. Electroencephalography provides objective data which can be used in the diagnosis of diseases affecting the organs of hearing and equilibrium.