Processing morphological ambiguity: An experimental investigation of Russian numerical phrases

Russian nouns in nominative and accusative numerical expressions appear in three different forms, depending on the numeral: nominative singular with the numeral 1, genitive singular with the paucal numerals 2–4, and genitive plural with all other numerals. Results from an acceptability judgment task and a self-paced reading task on Russian case/number marking provide support for a theory stating that the suffix used with paucal nouns is morphologically ambiguous. The ambiguity resolution process involving this suffix leads to extra processing cost, compared to the unambiguous suffixes in other numeral contexts (the number 1, and the numbers 5+). This would account for the additional processing time observed with the paucal nouns. The status of the form occurring with the paucal numerals has long been a challenging issue in Russian linguistics, and the new results add to the growing body of literature which makes use of experimental methods to address issues of linguistic theory and analysis.