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Feasibility of prenatal hearing test.
Acta Oto-Laryngologica. Supplementum
|January 1, 1985
Summary
Fetal responses to sound decrease with repeated stimulation, with motor responses affected first. Cardiac reactivity is a more reliable indicator for assessing prenatal hearing, especially at higher sound levels.
Area of Science:
- Fetal Physiology
- Auditory Development
- Neuroscience
Background:
- Fetal responses to auditory stimuli are variable.
- Factors influencing fetal reactivity include stimulus characteristics and fetal alertness.
Purpose of the Study:
- To investigate fetal responsiveness to sound stimulation.
- To examine the impact of stimulus repetition and fetal state on reactivity.
- To assess the reliability of motor and cardiac responses for evaluating prenatal hearing.
Main Methods:
- High-pass filtered pink noise stimuli at 106, 109, and 113 dB SPL were used.
- Responses were measured in fetuses aged 37-40 weeks.
- Fetal heart rate variability and motor responses (limb movements) were monitored.
Main Results:
- Fetal responsiveness decreased significantly after stimulus repetition, even at 113 dB SPL.
- Motor responses were more affected by repetition than cardiac responses.
- Fetuses showed reduced reactivity during low heart rate variability states compared to high variability states.
Conclusions:
- Cardiac reactivity is a more dependable measure than motor responses for repeated auditory stimulation in fetuses.
- Prenatal hearing assessment in utero is feasible and promising for detecting hearing impairments.
- Further research is needed to understand the influence of biophysical parameters on fetal auditory testing.