Evoked-response audiometry (or electric-response audiometry, ERA) is a collective term for techniques which record electrical activity response of the auditory pathway to auditory signals. These techniques allow conclusions about the hearing ability of the subject. According to the website corticalera.com, “the earliest report of relevance was that of Davis who identified the auditory cortical evoked response in 1939 although changes in the EEG evoked by a loud sound had been observed by Berger a decade earlier.” The first ERA technique was the cortical ERA (CERA) in which the cortical response is recorded from the vertex. Many tests had to be done for optimising the detection and analysis of the small bio-electronic signals. One of these tests is described in the paper of the day: “Validation of Evoked-Response Audiometry (Era) in Deaf Children” by Hallowed Davis (1966). It compares the ERA results with “old” testing methods for hearing ability which relied on behaviour signal to auditory signal. The measured ERA volume threshold for different auditory signals for different frequences differed from the voluntary thresholds (measured by behavioral response) just by 0.1dB. So no wonder that cortical ERA was in “widespread clinical use” just a handful of years later (in the 1970s). “Validation of Evoked-Response Audiometry (Era) in Deaf Children”
Hallowed Davis International audiology 5.2 (1966): 77-81
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