On the Cost of Introducing Speech-Like Properties to a Stimulus for Auditory Steady-State Response Measurements.
Søren Laugesen, Julia Eva Rieck, Claus Elberling and 2 others
PMID 30062913WHAT IT FOUND
Adding speech-like features to an ASSR stimulus kept detection rates similar but reduced response magnitude by about 4 dB and increased detection time by a factor of 1.5, less than 1 minute extra.
Key findings
01Detection rates accumulated across harmonics were very similar for the standard and speech-modified stimuli.
02At the first harmonic, the speech-modified stimulus showed a 3.7 dB magnitude reduction and a detection-time ratio of 1.5.
03The 50% mean increase in first-harmonic detection time corresponded to less than 1 minute of additional recording time.
STILL TO COME
How it was doneWhat they found
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What it does not show
Only 10 young adults with normal hearing were tested, and they were not infants. The stimulus was presented by insert phones, not through a hearing aid, so the study did not test the actual aided infant validation situation. Infants may be less compliant, and hearing-impaired aided responses may differ from the normal-hearing adult responses measured here. At higher harmonics, fewer detections made the estimated mean values less reliable. Detection times were computed with a more lenient criterion than the online detection, so the reported times are not exactly the clinical stopping time.
The easy way to misread this
Do not conclude that the speech-like stimulus is ready for infant hearing-aid validation. The study used 10 normal-hearing young adults and insert phones, not infants or hearing aids.