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Sound evoked frequency‐following responses in the central auditory pathway
Author(s) -
Marsh James T.,
Worden Frederic G.
Publication year - 1968
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1288/00005537-196807000-00003
Subject(s) - stimulus (psychology) , inferior colliculus , audiology , waveform , acoustics , amplitude , evoked potential , auditory system , physics , neuroscience , psychology , medicine , voltage , optics , nucleus , quantum mechanics , psychotherapist
An acoustically evoked response is described which reproduces the frequency and waveform of the stimulus. This frequency following response (FFR.) is recordable from gross electrodes in the central auditory pathway. The FFR. differs from an acoustic stimulus of graded onset, and the CM., in that it has a sharp onset and a latency appropriate to the locus from which it is recorded. It is less resistant to anoxia than CM., and disappears before CM. is seriously affected. The frequency range of FFR. increases with stimulus intensity. At 80 db SPL., the range is approximately 500 Hz. to 5 KHz. The waveform and amplitude of FFR. vary with stimulus frequency. Amplitude becomes smaller, and waveform becomes more variable. The contrast to the auditory evoked potential, which can be recorded widely in the brain, FFR. is recordable only within, or close to, the auditory pathway. We have observed it only at and below the level of the inferior colliculus. FFR. has implications for the neurophysiology of hearing which are different from those of the auditory evoked potential. Some of these are discussed.