Abstract
Isolated frog posterior semicircular canals were used. Three modes of cupula movement were defined:Movement 1: ordinary swinging-door deflection; Movement 2: cupula top fixation 1 achieved by immobilizing the central top portion of the cupula; Movement 3: cupula top fixation 2 achieved by immobilizing the entire top of the cupula. The ampullary nerve action potentials due to mechanical endolymphatic flow were recorded during these 3 kinds of cupula movements. Cupula top fixation 1 resulted in action potentials which were comparable to those of the swinging-door deflection in terms of the maximum spike count and the stimulus-response curve. Cupula top fixation 2 resulted in potentials with a maximum spike count comparable to that of swinging-door deflection; however, the response increase rate was very low. The time course of the potentials in cupula fixation 1 and 2 was extremely short (about 2-3 seconds) compared to that of the swinging-door deflection. These results suggest that the swinging-door deflection is physiologically the most relevant in providing the optimum response increase rate as well as in maintaining the time course of the tonic response.
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