The Western Berber languages are Zenaga and Tin Sert. They appear to have influenced the Algerian Songhai language Korandje. The label "Western Berber" was first used in a classificatory sense by Aikhenvald and Militarev (1984) in reference to Zenaga alone (Tetserrét data was not available to them.) Sound changes characteristic of this subgroup include the reflex of proto-Berber *ww as *bb (elsewhere gg/ggʷ) and *w (elsewhere retained) as *b after consonants; of *x (elsewhere retained) as *k; of *ṭṭ as ḍḍ (elsewhere ṭṭ); and of *ẓ as a voiceless fricative ṣ (Tetserrét) or θ̣ (Zenaga).