On tone in Tamang and neighbouring languages: synchrony and diachrony

For Tamang and the TGTM languages, and for the tonal dialects of Tibetan we make two claims:<br />1) The tone bearing unit is the morpheme or the word<br />2) Cooccurring laryngeal features are best analyzed as features of the tones.<br />The historical origin of these tones in segmental material at the beginning and the end of words is consistent with these synchronic claims