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(A) Prescan tone discrimination performance on the oddball task and least-square error Weibull fit to the psychometric curve for subject 4138. (B) Tone discrimination accuracy (±1 S.E.) for subject 4138 in the fMRI/ERP session at five deviant levels corresponding to 50, 65, 75, 85 and 95% prescan accuracy (black line). The grayed region shows the range in performance accuracy across 20 subjects.
