title: Derived evoked potentials for continuous tones using a hybrid electrical-acoustical stimulation.
abstract: Averaged VIIIth nerve and brainstem potentials are recorded in normal guinea pigs in response to electrical stimulation of the ear presented once without and once with a simultaneous masking continuous pure tone. The waveform difference yields a well synchronized 'derived signal' which is the response to the electrical stimulation of only the group of fibers masked by the pure tone. Study of very low frequency activation is a new possibility brought by this method which is efficient whatever the sound frequency. Pure tone thresholds obtained are similar to previous measurements. Response amplitudes are likely a measure of the number of fibers stimulated by the sounds.
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001307:Auditory Perception / Q000502:physiology*; D001933:Brain Stem / Q000502:physiology*; D003051:Cochlea / Q000502:physiology*; D004558:Electric Stimulation; D005071:Evoked Potentials; D006168:Guinea Pigs; D000159:Vestibulocochlear Nerve / Q000502:physiology*