Abstract
126 low birth-weight infants (born at 27 to 36 weeks postconceptional age), representing 252 ears, were classified into 5 groups by postconceptional age: 30-36 weeks, 37-42 weeks, 43-57 weeks, 58-73 weeks and 74-105 weeks. ABR waveform detection was made on these infants and detection rates were reviewed. ABR waveforms were detected and stable at 90dBnHL. When measured at 70dBnHL, waveforms were hardly detected if infants were younger in postconceptional age. Judged from the changes in the detection rates of ABR waveforms and of composite waves I-II, III-IV and IV-V among infants, auditory pathway seemed to continue developing even after birth with myelination progressing over the time both in rostral and caudal sides.
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