At least fourteen languages contrast a central and a back vowel which are otherwise identical (in height, rounding, tenseness, etc.). Three previous feature systems are argued to be inadequate for capturing these contrasts. A new model is proposed, redefining the feature [± back] (as a dependent of the Dorsal Node) so that it can distinguish between central and back vowels.
"Central vs. back vowels,"
Work Papers of the Summer Institute of Linguistics, University of North Dakota Session: Vol. 44, Article 5.
Available at: https://commons.und.edu/sil-work-papers/vol44/iss1/5