"Nakagawa Shouko explained during an October 4, 2006 appearance on the TBS network's educational program "Kojin Jugyou" that "otaku" spelled in hiragana represented the first generation of Japan's obsessive-compulsive fans who adopted the term in the 1980s. "Otaku" spelled in katakana then represents the second generation of Japanese obsessive fans from the 1990s. And "wotaku" identifies the current third generation of otaku from the 2000s."