| Type | MGI:General | Description | at 30-58 days of age, homozygotes display CAP thresholds shifts in a frequency-dependent manner, with a gain change of ~45 dB at 5 kHz and of ~60 dB at 33 kHz CAP input-output functions indicate that the low-level segment is absent, and response magnitudes are reduced for the high-level segment, especially at 12 and 32 kHz simultaneous masking curves for CAPs produced in response to a 12 kHz probe tone indicate absence of frequency selectivity (i.e. no tuning) in homozygotes |