FIG. 2.

Noise-induced threshold shift in chinchillas is commonly induced by 105 dB SPL × 6 h exposure. Deficits measured in various studies using this exposure paradigm are shown at different post-noise durations, including immediate (A), 7 days (B), 14 days (C), and 21 days (D) post-noise durations. ART# refers to the article IDs provided in Table III. Deficits shown in (D) at 21 days post-noise are assumed to be permanent. In (E), NIHL is averaged across studies. Sample sizes shown in each legend entry are the number of studies contributing data to the weighted average. (F) illustrates NIHL subsequent to a shorter but higher level exposure (112 dB SPL × 1 h; Bielefeld et al., 2011).