Averaged ABR Response Waveforms
ABR Recordings
ABRs are a useful and reliable tool for hearing screening. To get the clearest possible
responses, you will need to record using high
fi
delity equipment in a quiet environment. The
subject must be anesthetized and kept warm to prevent movement or stress from affecting the
response. Recordings should be performed in a shielded enclosure that has been set-up to
minimize noise interferences.
The TDT system for ABR recording is designed to minimize noise at every step, beginning with
an optically isolated, battery powered Medusa4Z preampli
fi
er. This device digitizes the biologic
responses right in the enclosure. The processor (RZ6) brings together stimulus production and
data collection on a single device and a single clock for precise timing. The system software
for experiment control and data visualization is PC based and is more
fl
exible than clinical
systems while still easy to use.
The diagram below shows a typical ABR system. Each part of the system will be discussed in
more detail as you read through this guide.
ABR Testing with the RZ6 and Medusa4Z | 7
