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FETAL AUDITORY RESPONSES

The eyelids, midface, and mouth are monitored ultrasonically during transuterine vibroacoustic stimulation. The test sequence is an "orienting", .5 second noise burst (150-1600 Hz, 100 dB), followed after 30 seconds with 10 bursts spaced one second apart.We have shown previously that motor responses begun abruptly at 24½ weeks gestational and are elicited invariably by 28 weeks in normal fetuses. Head aversion, eyelid, and mouth movements are dissociated initially. By 28 weeks these startle components are linked. We now report decremental response after 32 weeks for head aversion (but not eyeblink), which is exponential with gestational age. The effect may represent discriminatory response threshold, progressive cerebral modification of a midbrain response mechanism, or a type of prestimulus inhibition.Deafness is diagnosed by absence of any response in the presence of normal eye and diaphragm movements (or other indicator of wellbeing). Declining fetal condition is associated with irritability, reversal of startle decrement, and finally, loss of responsiveness. Delayed response patterns were seen in individual cases of fetal alcohol and marijuana sydromes, triplody, trisomy 18, and 3 cases of hydrocephalus, but not in one case of Down's syndrome.