The spike encoding mechanisms at the cyto-neural junction was studied by measuring the rates of excitatory post-synaptic potentials (EPSPs) and of action potentials recorded from the afferent nerve terminal. Spikes were recognized and counted whereas EPSP rate was indirectly computed using a noise analysis procedure. EPSP and Spike rates in response to acceleratory impulses to the labyrinth were considered as functions of time and related to each other by means of standard techniques in order to obtain an estimate of the encoder transfer function. Our results show that the input- output relation is complex, suggesting that different ionic conductances are involved in the action potential generation mechanisms
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