“…It has been the focus of more than 200 published studies (nearly 150 of which have been published in the last 10 years). The equation has been shown to hold with prehension movements (e.g., Bootsma, Marteniuk, MacKenzie, & Zaal, 1994), mouse cursor movements (e.g., Lin, Radwin, & Vanderheiden, 1992), rotational movements (e.g., Abrams, Meyer, & Kornblum, 1990), head movements (e.g., Jagacinksi & Monk, 1985), and foot movements (e.g., Hoffmann, 1991). The equation holds underwater (Kerr, 1973), in near zero-gravity environments (Jungling, Bock, & Girgenrath, 2002), with microscopic targets (Langolf, Chaffin, & Foulke, 1976), with imaginary movements (Sirigu et al, 1996), and with targets that have illusory IDs (e.g., Fischer, 2001).…”