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. 2017 Jan 24;11:2. doi: 10.3389/fnsys.2017.00002

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Copyright © 2017 Eggermont.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A,B) SP and compound action potential (CAP) waveforms as a function of the interstimulus interval (ISI). The SP, being a pre-synaptic potential, does not show the phenomenon of adaptation as the CAP does. When the ISI value is lowered the CAP amplitude decreases but the SP amplitude remains constant. Panel (A) shows at an ISI of 4 ms, only the SP⁻ remains and closely resembles the stimulus envelope. From Eggermont and Odenthal (1974a). Panel (B) shows a combination of SP⁺ and SP⁻ in one recording. In ears showing a transition from SP⁻ to SP⁺ as described in Figure 6, for high frequencies a quite peculiar phenomenon may be observed. It appears as an SP⁺ followed after some latency by a smaller SP⁻ thus forming an early positive peak, which is persistent to low intensity levels. From Eggermont (1976c).