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Parameters obtained from fits of Eq. (1) to response rate functions of individual mice. (A) Delta (δ): # * BALB/c mice responded at significantly higher maximum rates under milk compared to pellet reinforcers and at higher maximum rates than C57BL/6 mice. (B) Specific Activation (a): Effects of strain, reinforcer type, and their interacton were all non-significant. (C) Saturation rate (λ): #* Rate of saturation is signficantly greater for BALB/c mice compared to C57BL/6 and DBA/2 mice.
