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Mean (±1 SEM) accuracy expressed as percent correct matches when morphine was tested one and seven days after MCAM in a group of five monkeys (group data, 2a). The same data, for individual monkeys, are plotted in Fig 2b (one day after MCAM) and Fig 2c (seven days after MCAM). Abscissae: delay in seconds between the sample and comparison components. The shaded regions denote the 95% CI for saline.
