“…Extensive research since the 1960s has shown that Equation 2, the hyperbolic absolute response rate form, and Equation 5, the power function version of the matching law, provide excellent descriptions of the behavior of many vertebrate animal species in single- and multialternative environments (Baum, 1974, 1979; Dallery, McDowell, & Lancaster, 2000; de Villiers, 1977; de Villiers & Herrnstein, 1976; McDowell, 1988b, 1989; Wearden & Burgess, 1982). A body of research that is at least as extensive has shown that human behavior is also governed by these equations (Beardsley & McDowell, 1992; Bradshaw, Szabadi, & Bevan, 1976, 1977, 1978; Bradshaw, Szabadi, Bevan, & Ruddle, 1979; Buskist & Miller, 1981; Cliffe & Parry, 1980; Dallery, Soto, & McDowell, 2005; Kollins, Newland, & Critchfield, 1997a, 1997b; McDowell & Wood, 1984, 1985; Moffat & Koch, 1973; Pierce & Epling, 1983; Ruddle, Bradshaw, & Szabadi, 1981; Ruddle, Bradshaw, Szabadi, & Foster, 1982; Takahashi & Iwamoto, 1986). In a large majority of these experiments with animal and human subjects, the equations accounted for large proportions of variance in individual-subject response rate ratios (for multialternative environments described by Equation 5), or in the absolute response rates of individual subjects (for single-alternative environments described by Equation 2), regardless of species.…”