Optimizing the stimuli to evoke the amplitude modulation following response (AMFR) in neonates

Ear and Hearing
Raquel RiquelmeGerald Leonard

Abstract

The goal was to identify stimulus features that enhance the detection of the amplitude modulation following response (AMFR) in neonates. The features explored were (1) envelope type, sinusoidal versus a half-wave rectified sinusoid (transposed); (2) best modulation frequency; and (3) spectral content, i.e., tone versus band-pass noise. Results are based on recordings from 149 babies (80 babies in the neonatal intensive care unit and 69 newborn infants). All had passed hearing screening based on the click-evoked ABR. Babies were not sedated. We used carrier frequencies of approximately 500, 1000, 2000, and 4000 Hz and modulation frequencies between approximately 25 and 98 Hz. For the noise stimuli, we used band-pass noise at center frequencies of 500, 1000, 2000, and 4000 Hz. All stimuli were presented through insert earphones delivered simultaneously to both ears, at intensities ranging from 20 to 70 dB SPL. Magnitude squared coherence, phase coherence, and spectral criteria were used to detect criterion AMFRs. We analyzed four measures: (1) percent of satisfied runs; (2) the amplitude of criterion AMFR; (3) time to detect a criterion AMFR; and (4) response strength (e.g., the value of the magnitude squared coherence when it re...Continue Reading

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Citations

Mar 3, 2011·The Journal of the Acoustical Society of America·Lin Bian, Shixiong Chen
Jul 17, 2009·The Journal of the Acoustical Society of America·Bram Van DunMarc Moonen
Dec 20, 2011·International Journal of Audiology·Pavel Prado-GutierrezAlejandro Torres
Mar 17, 2012·Acta otorrinolaringológica española·Eleina Mijares NodarseAgustin Lage Castellanos
Aug 12, 2009·Neuroscience·S LippéM Lassonde
Feb 5, 2016·Journal of Neurophysiology·Christopher M LeeHeather L Read
May 13, 2021·PloS One·Joyshree BiswasDavid C Martinelli
Jul 13, 2021·Trends in Hearing·Vijayalakshmi EaswarDavid W Purcell

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