Auditory brainstem response Key Mandatory Questions and Correct Answers 2024

what type of recording is ABR? - far-field, exogenous response is ABR near field or far field? - far-field Is ABR endogenous, exogenous, mesogenous? - exogenous response How many waves are in an ABR? - comprised of 6-7 waves (i.e. peaks) ABR is measured within ______________ relative to stimulus onset - first 12 millisecond early latency is: - time-locked Waves will be _______ apart - millisecond Wave I generator - - distal portion of 8th nerve - 1st order neurons - AP for ECoG Wave II generator: - - central portion of 8th nerve - might not have always Wave III generator - - cochlear nucleus - post synaptic portion - 8th nerve to 2nd order neurons in cochlear nucleus - activity in synapse from 1st order to 2nd order neurons Wave IV generator: - - crossover between cochlear nucleus and superior olivary cortex - 2nd order neurons to 3rd order neurons Wave V generator: - - Lateral Lemniscus - 3rd order neurons to 4th order neurons Wave VI generator: - - Lateral Lemniscus and Inferior Colliculus - 4th order neurons to 5th order neurons Wave VII generator: - - Medial Geniculate Body to Radial Fibers - 5th order neurons to 6th order neurons peripheral portion of 8th nerve is what wave? - Wave I central portion of 8th nerve is what wave? - Wave II Cochlear Nucleus is what wave? - Wave III Cross over between cochlear nucleus and superior olivary cortex is what wave? - Wave IV Lateral Lemniscus is what wave? - Wave V Lateral Lemniscus and inferior colliculus is what wave? - Wave VI Medial geniculate body to auditory radial fibers is what wave? - Wave VII Various peaks of ABR are likely produced by: - stationary dipoles - positive and negative ends