[Model of the formation of nystagmic reactions to a set of caloric tests].
The model can furnish additional information about the vestibulary system, when evaluating caloric tests. The model has been built with certain assumptions being made. The nystagmus intensity (the slow component rate during maximum intensity) is assumed to be proportional to the difference between energy levels (EL) of the right and left vestibular nuclear complexes (NC). El of each NC is equal to the afferent flow (AF) plus its inherent activity (IA). During caloric (two warm and two cold) tests IA remains constant. AF at rest is equal to spontaneous activity of receptors and during stimulation it increases or decreases in a linear fashion. Parameters of the model are: difference between intensities of reactions to warm and cold tests, difference between EL of two (right and left) unstimulated NC, and ratio of nystagmus intensity to the stimulus for each labyrinth. The behavior of the model during vestibular dysfunctions of various origin (changes in one of AF characteristics or changes in IA of one NC) is discussed. The diagnostic application of the model is illustrated by the discussion of nystagmometric data. The conclusion about vestibular dysfunction and its etiology can be made on the basis of statistic analysis of parameters of the model in the norm.
D002150:Caloric Tests; D005133:Eye Movements; D006801:Humans; D007759:Labyrinth Diseases / Q000175:diagnosis / Q000503:physiopathology; D008433:Mathematics; D008954:Models, Biological; D014722:Vestibule, Labyrinth / Q000502:physiology
Model' formirovaniia nistagmennykh reaktsiĭ na kompleks kaloricheskikh testov.