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Related Concept Videos

Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...

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Infant Auditory Processing and Event-related Brain Oscillations
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Otoacoustic emissions latency difference between full-term and preterm neonates.

W Wiktor Jedrzejczak1, Stavros Hatzopoulos, Alessandro Martini

  • 1Institute of Physiology and Pathology of Hearing, ul. Zgrupowania AK Kampinos 1, 01-943 Warsaw, Poland. wieslaw.jedrzejczak@fuw.edu.pl

Hearing Research
|July 4, 2007
PubMed
Summary

Transiently evoked otoacoustic emissions (TEOAEs) reveal differences in preterm neonates, with longer latency components potentially linked to spontaneous otoacoustic emissions (SOAEs). These findings aid in understanding neonatal auditory development.

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Area of Science:

  • Otoacoustic Emissions Research
  • Neonatal Auditory Neuroscience
  • Audiology

Background:

  • Transiently evoked otoacoustic emissions (TEOAEs) are crucial for assessing neonatal hearing.
  • Understanding differences in TEOAEs between full-term and preterm neonates is vital for early auditory diagnostics.

Purpose of the Study:

  • To analyze and compare TEOAE components in full-term and preterm neonates.
  • To investigate the origin of latency differences observed in preterm infants.

Main Methods:

  • Recording TEOAEs from full-term and preterm neonates.
  • Decomposing TEOAE responses using an adaptive approximation method into frequency, amplitude, latency, and time span components.
  • Analyzing differences in TEOAE component characteristics between groups.

Main Results:

  • Statistically significant differences in latency and time span components of TEOAEs were found between neonates.
  • Preterm neonates exhibited a higher contribution of long-duration TEOAE components with frequency-independent latencies.
  • Removing long-duration components reduced latency differences between preterm and full-term groups.

Conclusions:

  • Longer TEOAE latencies in preterm neonates (up to 33 weeks post-conceptional age) are attributed to the presence of long-duration components.
  • The frequency characteristics of these long-duration components suggest a potential link to spontaneous otoacoustic emissions (SOAEs).
  • Findings contribute to understanding the maturation of the neonatal auditory system and the mechanisms of otoacoustic emissions.