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There has recently been renewed interest in the early development of audition, especially in the fetus and neonate, but new techniques are required before reliable substantive findings can be made. A measurement system is described for assessing the capacity of the animal (goat) fetus for response to audio-frequency stimulation. Particular emphasis placed on the characteristics and development of an internally implanted hydrophone for monitoring sound levels close to the fetal head. Sound levels generated by an externally mounted vibrator and monitored at the uterine wall underwent attenuation increasing with gestational age. This is attributed to changes in the geometry of the goat with advancing pregnancy.
Bench et al. (Mon,) studied this question.