“…If the model is valid, each experimental manipulation should selectively affect the parameter of interest, but not others. This approach has found widespread use in cognitive psychology (Bayen, Murnane, & Erdfelder, 1996;Buchner, Erdfelder, Steffens, & Martensen, 1997;Buchner, Erdfelder, & Vaterrodt-Plünnecke, 1995;Chechile & Meyer, 1976;Erdfelder & Buchner, 1998;Klauer, Stahl, & Erdfelder, 2007;Klauer & Wegener, 1998;Nadarevic & Erdfelder, 2011;Steffens, Buchner, Martensen, & Erdfelder, 2000). To our knowledge, however, a test of the GCM's validity has not been attempted so far.…”