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Differentiating CAPD from Auditory Neuropathy Spectrum Disorders Charles Berlin, Ph.D. July 2011 Test Normal hearing and/or central auditory processing disorder in simple form (normal audiogram) Outer hair cells damaged (audiogram from normal to 65 dB in pure form) Inner hair cell/nerve fibers damaged (audiogram from normal to total deafness) Conductive obstruction in the outer or middle ear (bone conduction better than air conduction) Tymps/Reflectance A A A B and C Reflexes Normal levels 75-95 dB Normal levels 75-95 dB Elevated or absent Absent or elevated Emissions Present Absent Present or at one Absent or time present elevated ABR five-wave complex Normal to all stimuli down to Normal until threshold Absent and/or desynchronized Shifted to right
