Linear gain and phase in seismic neurons
Abstract
In nearly quiescent seismic environments, many bullfrog (Rana catesbeiana) saccular afferent axons exhibit ongoing activity, typically ranging from 10 to 80 spikes/s. Low-level vibration of the whole animal [see H. Koyama et al., Brain Res. 250, 168–172 (1982) for methods] produces linear modulation of this activity, allowing one to define small-signal linear transfer ratios and to observe tuning curves for such axons. Each tuning curve to date reflects multiple resonances, sometimes coalescing with no intervening antiresonances, sometimes separated by simple antiresonances. The latter typically are much sharper than the resonances on either side, indicating that they are not simply concomitants of additive parallel resonances. Phase lag typically increases by two cycles or more with increasing frequency through the tuning range (roughly 10 to 200 Hz), with abrupt half-cycle declines through the antiresonances. Resonant and antiresonant frequencies vary from axon to axon, usually lying between 20 and 120 Hz. The amplitudes of peak transfer ratios vary approximately from 50 to 200 spikes/s per cm/s2. At 100 Hz, where it occasionally is found, the latter corresponds to approximately one spike/s response for whole-animal displacement of 10 pm. [Supported by NSF Grant BNS-8005834.]
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