Sentence production in semantic dementia (Koukoulioti et al., 2018)

<div><b>Purpose:</b> Language production in semantic dementia</div><div>(SD) is characterized by a lexical–semantic deficit</div><div>and largely preserved argument structure and inflection</div><div>production. This study investigates (a) the effect</div><div>of argument structure on verb retrieval and (b) the</div><div>interrelation between inflection marking and verb retrieval</div><div>in SD.</div><div><b>Method: </b>Seven individuals with SD and 7 healthy controls</div><div>performed 2 sentence elicitation tasks. In Experiment 1,</div><div>participants described the action taking place in a video.</div><div>In Experiment 2, they watched the same videos preceded</div><div>by a phrase prompting the production of past tense.</div><div>Three verb classes were tested: (a) unergative (e.g., to</div><div>walk), (b) unaccusative (e.g., to fall ), and (c) transitive with</div><div>1 object (e.g., to read a book).</div><div><b>Results:</b> There was not any quantitative difference among</div><div>the verb classes in Experiment 1, but error analysis hinted</div><div>at difficulties related with argument structure complexity.</div><div>The findings of Experiment 2 suggest no general effect of</div><div>inflection on verb retrieval; nevertheless, inflection marking</div><div>impeded the retrieval of verbs with complex argument</div><div>structure. Large individual variation was established.</div><div><b>Conclusions: </b>Argument structure complexity may challenge</div><div>speakers with SD. Verb retrieval and inflection marking</div><div>seem to interrelate at the expense of the former. Inflection</div><div>production may be affected at severe stages of the disease.</div><div><b><br></b></div><div><b>Supplemental Material S1.</b> Description of the language profile of the patients and details on the selection criteria.<br></div><div><br></div><div><b>Supplemental Material S2.</b> Comments on the construction of the material: Experiment 1. <br></div><div><b><br></b></div><div><b>Supplemental Material S3.</b> Verbs used in each verb class.<br></div><div><br></div><div><div><b>Supplemental Material S4. </b>Comments on the construction of the material: Experiment 2.</div><div><br></div><div><b>Supplemental Material S5. </b>Overview of the material used in Experiment 2. </div><div><br></div><div><b>Supplemental Material S6. </b>Comparisons of the individual scores to the scores of the control group.</div><div><br></div><div><b>Supplemental Material S7.</b> Comparison of the individual patient performance to the performance of the control group in Experiment 1. </div><div><br></div><div><b>Supplemental Material S8.</b> Comparison of the individual patient performance to the performance of the control group in Experiment 2. </div><div><br></div><div><b>Supplemental Material S9.</b> Comparison of the individual patients to the control group with respect to the difference in the scores between the tasks. </div></div><div><br></div><div>Koukoulioti, V., Stavrakaki, S., Konstantinopoulou, E., & Ioannidisd, P. (2018). Lexical and grammatical factors in sentence production in semantic dementia: Insights from Greek. <i>Journal of Speech, Language, and Hearing Research, 61, </i>870–886<i>.</i> </div>