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  • Title: Forward masking in gerbils: the effect of age.
    Author: Gleich O, Hamann I, Kittel MC, Klump GM, Strutz J.
    Journal: Hear Res; 2007 Jan; 223(1-2):122-8. PubMed ID: 17158007.
    Abstract:
    We investigated forward masking in 21 gerbils as a function of age (5-47 months) using 400ms maskers at 40dB SPL and a 20ms, 2.85kHz probe presented 2.5ms after the masker. Elevated thresholds for the unmasked probe were only observed in animals older than 3 years. Unmasked thresholds showed no significant age-dependent hearing loss in animals below 3 years of age. In these animals without peripheral hearing loss, we found a significant age-dependent increase of masker-induced threshold shift. A regression analysis revealed that threshold shift increased from 23dB in 1 year old gerbils to 37dB in 3 year old animals. Increased forward masking in these animals with no sign of peripheral hearing loss points to a central processing deficit.
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