In humans, the onset of the auditory function occurs at the beginning of the third trimester of pregnancy. Brainstem auditory evoked potentials (BAEPs) can be recorded in preterm neonates as early as 25-26 weeks of gestational age. The latency of BAEP waves show a significant decrease according to increasing age to achieve adult values at the end of the first month after birth for wave I and near 3 to 5 years old for waves III and V. Auditory evoked responses are influenced by gender, notably with significantly higher wave latencies in males than in females. These gender differences in auditory function appear early in humans, some being observed as soon as 34 weeks of gestational age.
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