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Purpose: The abilities of 5-year-old children with and without language impairment (LI) to detect anomalies involving lexical items and grammatical morphemes in stories were compared. The influence of sentence versus discourse context on lexical anomaly detection rates was explored. Method: The participants were read 3 story scripts and asked to detect the anomalies embedded in them. Results: Typically developing (TD) children outperformed their peers with LI across the board. For both groups, lexical anomalies were easier to detect than morphological anomalies. Similarly, anomalous nouns were easier for both groups to detect compared with anomalous verbs. The latter presented a particular challenge to the children with LI. Both groups had greater difficulty with lexical anomaly detection in discourse relative to sentence context. Conclusion: These outcomes suggest that children's ability to detect anomalies is sensitive to the nature of the anomaly and the linguistic context involved in anomaly detection. Future research may address the relative role of linguistic and cognitive factors in anomaly detection. Key Words: language, language disorders, children, morphology, specific language impairment, An anomaly or error occurs when a word or a morpheme is incompatible with its surrounding linguistic context. The anomaly may be lexical or morphological in nature. A lexical anomaly [...]

Case markers are thought of primarily as nominal morphemes, indicating the function of a noun phrase in a clause. In a few languages of the world case markers also appear on verbal forms. Such 'versatile' cases can express (i) temporal, causal and other relationships between clauses, and (ii) aspectual and modal meanings within a clause. Core cases tend to express aspectual and modal meanings, while oblique cases tend to be used as clause-linkers. The recurrent semantic differences between case morphemes as nominal markers, as clause-linking devices, and as exponents of clausal categories are rooted in the inherent polyfunctionality of these 'chameleon' morphemes: the specific meaning of any instance is affected by the morphosyntactic context in which it occurs. The conclusions are corroborated by a case study of Manambu, a Papuan language with extensive use of cases on nouns and on verbs, as exponents of aspectual and modal meanings and as clause-linking devices.