Page "Hittite language" Paragraph 11

According to Craig Melchert, the current tendency is to suppose that Proto-Indo-European evolved, and that the " prehistoric speakers " of Anatolian became isolated " from the rest of the PIE speech community, so as not to share in some common innovations.

" Hittite, as well as its Anatolian cousins, split off from Proto-Indo-European at an early stage, thereby preserving archaisms that were later lost in the other Indo-European languages.