Sami languages
Preaspiration in the Sami languages occurs on word-medial voiceless stops and affricates of all places of articulation available: . In the Western Sami languages (Southern, Ume, Pite, Lule and Northern) as well as Skolt Sami, preaspiration affects both long and half-long consonants; in most Eastern Sami languages (Akkala, Kildin and Ter) only fully long consonants are preaspirated. This likely represents two waves of innovation: an early preaspiration of long consonants dating back to Proto-Sami, followed by a secondary preaspiration of half-long consonants that originated in the Western Sami area and spread eastwards to Skolt Sami.