Which analysis parameter is most affected when auditory brainstem response testing is conducted with supra-aural earphones rather than insert earphones?

Which analysis parameter is most affected when auditory brainstem response testing is conducted with supra-aural earphones rather than insert earphones?

• A. Absolute latencies
• B. Interpeak latencies
• C. Interaural latencies
• D. Amplitude

Answer: (A)

When you look at ABR measurements, the timing of when the waves appear after the stimulus is delivered is the key. The exact path the sound takes to reach the cochlea can introduce a small but real delay. Insert earphones sit inside the ear canal and provide a more direct, consistent delivery, leading to shorter, more uniform transmission times. Supra-aural headphones rest on the outer ear, adding a bit of extra delay from the stimulus generator to the cochlea. Because absolute latencies track the actual onset timing of the neural response, this transducer-related delay shifts these latencies more than any other ABR measure. Interpeak latencies reflect the speed of neural conduction between waves, so they tend to stay the same if the waves are shifted by a constant amount. Amplitude can vary with recording conditions and stimulus properties, but the primary effect of changing earphones is on timing rather than the size of the response. So the parameter most affected by using supra-aural earphones is the absolute latency.

When you look at ABR measurements, the timing of when the waves appear after the stimulus is delivered is the key. The exact path the sound takes to reach the cochlea can introduce a small but real delay. Insert earphones sit inside the ear canal and provide a more direct, consistent delivery, leading to shorter, more uniform transmission times. Supra-aural headphones rest on the outer ear, adding a bit of extra delay from the stimulus generator to the cochlea. Because absolute latencies track the actual onset timing of the neural response, this transducer-related delay shifts these latencies more than any other ABR measure.

Interpeak latencies reflect the speed of neural conduction between waves, so they tend to stay the same if the waves are shifted by a constant amount. Amplitude can vary with recording conditions and stimulus properties, but the primary effect of changing earphones is on timing rather than the size of the response. So the parameter most affected by using supra-aural earphones is the absolute latency.