Development of low-frequency tone burst versus the click auditory brainstem response.
Often ABR threshold testing employs clicks to assess high-frequency hearing, and low-frequency tone bursts to assess low-frequency sensitivity. While a maturation effect has been shown for click stimuli, similar data are lacking for low-frequency toneburst stimuli. Thus, 305 infants ranging in conceptional age (CA) from 33 weeks to 74 weeks were tested. Absolute latencies were measured for wave V at 55, 35, and 25 dB nHL in response to a click and for wave V500 in response to a 500 Hz tone burst. Major wave latency in response to 500 Hz tone bursts decreases with age and do not stabilize by 70 weeks CA. Likewise, waves III and V latencies in response to clicks decrease with age, as has been reported by others, and do not stabilize by 70 weeks CA. Wave I latency produced by clicks did not decrease with age, being mature by 33 weeks CA.
Hurley
Raymond M
RM
Department of Communication Sciences and Disorders, University of South Florida, Tampa, FL 33620-8150, USA. rhurley@chuma1.cas.usf.edu
Hurley
Annette
A
Berlin
Charles I
CI
D000367:Age Factors; D001300:Audiometry, Evoked Response / Q000379:methods; D002675:Child, Preschool; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006316:Hearing Loss, High-Frequency / Q000175:diagnosis* / Q000453:epidemiology; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis* / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D015997:Neonatal Screening / Q000379:methods; D010470:Perceptual Masking; D018570:Risk Assessment; D012680:Sensitivity and Specificity