Question
At approximately what latency would you expect to find 500, 2000, 4000 tone burst using 37.1 presentations per second as the rate, at about 30 dBnHL?
Answer
To date, comprehensive published normative latency data for tone burst ABR thresholds does not exist. However, many research teams are currently studying this and will hopefully have more information for us in the near future. Some preliminary data suggests the following:
Using the settings: 30 dB nHL tone burst, Blackman filter, 2-0-2 ramp/plateau, 39.1 clicks per second, low filter setting of 30-50 Hz and high filter setting of 1500 Hz, and using rarefaction without masking - the following latencies can be used as a guideline - but they are not firm ''norms,'' nor are they ''diagnostic.''
Tone: Latency (msec)
500 Hz: 12.06 +/- 1.41
2KHz: 8.88 +/- .55
4KHz: 8.62 +/- 0.78
Michelle Petrak, Ph.D.
Dr. Petrak is a clinical audiologist and product manager for evoked potential technologies at ICS Medical Corporation in Schaumburg, IL.
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