Human Fetal Evoked Response to Acoustic Stimulation

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Abstract
Human fetal evoked response to acoustic stimuli was recorded from the abdominal wall of six mothers at the 32th to 38th week of pregnancy. Tone bursts with frequency of 1000 Hz, duration of 50 msec, and rise and decay time of 13 msec were given every 4 seconds through a bone vibrator attached to the maternal abdominal wall at the nearest place to the fetal ear. The responses were conducted through an active electrode located on the maternal abdominal wall in the vicinity of the fetal vertex and were averaged by a digital computer. The typical wave form of the response consisted of four prominent deflections: a negative, a positive, a negative and a positive deflection with respective peak latencies of 100 to 150 msec, 200 to 300 msec, 500 to 600 msec and 700 to 800 msec. These deflections of the fetal evoked response were considered to correspond to the four components (N1, P2, N2, P3) of the slow “vertex potential” to auditory stimulus in young children. However, the decision can not be reached as to whether the response obtained in the present study is originated in the fetal brain and depends on the fetal auditory function.

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