Trastorno específico del lenguaje: subtipos de una patología compleja

There are various proposals for psycholinguistic markers and for taxonomies of specific language impairment (SLI). This study presents the results obtained in eight psycholinguistic tasks by two groups of Spanish-speaking children: 31 children with SLI (SLI) and 31 children matched for chronological age (CA). The tasks were developed ad hoc to assess psycholinguistic markers in the four traditional areas: phonology, morphosyntax, semantics and pragmatics. Firstly, we found that SLI group scored significantly worse than CA group in the eight tasks. Secondly, a K-Means cluster analysis distinguished five clusters within the 31 subject of SLI group. Thirdly, a discriminant analysis checks whether an a priori clinical classification is maintained after the study results. We present the profile of these clusters and discuss their features regarding Rapin & Allen taxonomy clinical subtypes. Finally, the similarities and differences between the two classifications are analyzed. The results obtained in this work help shed light on the psycholinguistic markers of the Spanish-SLI and reinforce the clinical utility of its classification into subtypes and the validity of the Rapin & Allen taxonomy.