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Linear indifference functions obtained for the sham-lesioned (empty circles) and AcbC-lesioned (filled circles) groups. Ordinate: indifference delay to the larger reinforcer (dB(50), s); abscissa: imposed delay to the smaller reinforcer (dA, s). Points show group mean data; vertical bars indicate SEMs; lines are best-fit linear functions. Equations for the fitted functions: sham-lesioned rats, dB(50)=3.58dA+6.39 (r2>0.97); AcbC-lesioned rats: dB(50)=2.88dA+0.45 (r2>0.95).
