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Auditory brainstem responses (ABRs) in a 26-week preterm newborn with auditory neuropathy spectrum disorder (ANSD). Three-month ABRs (a) show small early components, whereas a cochlear microphonic (CM) was detectable 9 months later (b), suggesting a late, although partial, maturation. Auditory steady-state responses (ASSRs) remain absent in both ears.
