“…Although the validity of this heuristic definition has never been scrutinized, a considerable number of researchers on various topics in Japanese linguistics present data as soliloquy, e.g., Uyeno 1972, Kuroda 1979, Cheng 1987, Moriyama 1989, Maynard 1991, Nitta 1991, Hirose 1995, Tokui 1995, Usami 1995, Ono and Nakagawa 1997, Suzuki 1997, Washi 1997, Okamoto 1999, Izuhara 2003, Shinzato 2004, Noda 2006, Hirose and Hasegawa 2010 to name a few.…”