[Auditory brainstem responses to logon and tone burst 1000 Hz frequency stimuli in infants--own experience].
The use of frequency-specific stimuli in recording auditory brainstem responses (ABR) allows for hearing objectivity concerning the given frequency. Non-linear intensity growth (logon) and linear intensity growth (tone burst), 1000 Hz frequency short tone stimuli are most commonly used. Differences between hearing threshold values and other ABR measures in recordings obtained after stimulation with broad-band click and logon were analysed in a group of high-risk infants. 71 infants aged 1 to 9 months (36 girls and 35 boys) were included in the group. Broadband envelope shaped 2000-4000 Hz repeated 5 times per second clicks, acquisition and analyse time 12.5 ms and Gauss shaped 1000 Hz logon and tone bursts repeated 4 times per second, acquisition and analyse time 20.0 ms were used as stimuli. Click induced mean threshold values were the same after stimulation with logon, tone bursts and clicks. Wave 1, III and V latencies decreased with stimulus frequency. Mean amplitudes of waves I, III and V obtained after logon stimulation were slightly higher than after tone burst stimulation.
Zagólski
Olaf
O
Poradnia Diagnozy i Rehabilitacji Dzieci i Młodziezy z Wada Słuchu P.Z.G. Kraków. rsc@inetia.pl
D000161:Acoustic Stimulation / Q000379:methods; D001300:Audiometry, Evoked Response / Q000379:methods*; D001304:Auditory Diseases, Central / Q000503:physiopathology; D001309:Auditory Threshold; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006316:Hearing Loss, High-Frequency / Q000503:physiopathology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D011044:Poland; D012890:Sleep