Normal peripheral hearing: pure tone air conduction thresholds less than or equal to 20 dB HL at octave frequencies between 250-8000 Hz for each ear; word recognition scores in quiet greater than or equal to 88% for each ear; normal 226 Hz tympanometry (middle ear peak pressure at 0 plus/minus 100 daPa and peak compensated static compliance of 0.3-1.5 mmho); no history of chronic otitis media, PE tubes, or hearing loss