Shinobu ORIKUCHI discovered using ancient Norito that there existed two types of ancient Norito: the norito type, in which a sentence ended with the phrase "to-noru (nou)" (declare); and the yogoto type, in which a sentence ended with the phrase "to-mousu" (humbly report).
折口信夫は古代祝詞の用例から「～と宣る（宣ふ）」と結ぶノリト型と「～と申す」と結ぶヨゴト型の別のあることを探りだした。