Performance of an individual rat on the behavioral task following systemic treatment with saline or salicylate. Top panel: For each of the acoustic conditions (AM, Quiet and NBN), the proportion of trials identified as NBN is plotted over 16 days of testing. Bottom panel: When the rat’s behavioral performance was plotted according to z-score, saline treatment (Day 5) did not significantly affect the rat’s ability to identify Quiet or the other two conditions (NBN or AM), whereas following treatment with salicylate (Day 10), the rat incorrectly identified the Quiet condition as NBN significantly more than baseline indicating the presence of a steady NBN-like phantom sound (i.e., tinnitus). The horizontal black line in the bottom panel indicates the one-tailed criterion for significance.