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The new paper published by Borja Herce and Chundra Cathcart looks at the distribution, sources, and motivations of irregular stem shortening in the history of Romance verbs. It argues that efficient transfer of information provided a preference for short stems in high frequency values and verbs, while the distribution of preexisting stem allomorphy in the family shaped the exact distribution of shortening within the inflectional paradigm.
Herce, B. and Cathcart, C.A. (2023), Short vs Long Stem Alternations in Romance Verbal Inflection: The S-Morphome. Trans Philologic Soc. doi.org/10.1111/1467-968X.12271