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. 2014 Jan 9;10:1. doi: 10.1186/1744-9081-10-1

Figure 1.

Figure 1

Stimulus control (square root-transformed percentage of responses on the reinforcer-producing lever) in SHR/NCrl and WKY/NHsd, males and females, exposed to 1, 3, or 6 mg/kg PCB 153 or to corn oil only. A percentage of √50 (~7.07) represents chance level where the animal presses the reinforcer-producing lever and the alternative the same number of times. The stippled lines represent the change in reinforcement schedule from VI 3 s to VI 180 s. Sessions 30 and 39, used in the video-analyses, are marked on the x-axes in red.