“…Authors examining visual space perception (Baird & Wagner, 1991;Gogel, 1998;Hershenson, 1992), haptic space perception (Barac-Cikoja & Turvey, 1995), and space cognition (Hubbard, Kall, & Baird, 1989) have developed their arguments on the basis of Equation 6. However, several studies (Gogel, Wist, & Harker, 1963;Higashiyama & Kitano, 1991;Vogel & Teghtsoonian, 1972) have provided evidence that Equation 6 is too restrictive to describe the relations among S′, D′, and θ. Alternatively, a number of studies (Foley, 1967(Foley, , 1968Higashiyama & Shimono, 1994;Oyama, 1974) have assumed that S′/D′ is a power function of θ:…”