SUBSTANTIATION OF THE TYPOLOGY OF PRIMARY SYSTEMIC SPEECH UNDER DEVELOPMENT

Abstract

The article considers the issue of the typology of speech development disorders that belong to the group of primary systemic speech underdevelopment (PSSU). The current state of science and practice development of speech-language pathology (SLP) allows us to identify within the once unified nosology several separate pathologies of speech activity which require separate study and use of differential methods for their diagnosis and overcoming. The author analyzes the historical way of forming scientific thought about alalia as a primary systemic underdevelopment of speech. He draws attention to some inaccuracies that have resulted from a certain inconsistency of the positions of individual scientists on the one hand, and the inertia of SLP practice on the other. This actually contributed to the consolidation in the SLP of somewhat outdated ideas about the nature of systemic speech underdevelopment and the variability of its expression in the speech activity of children. Outdated classifications inherited from the former USSR do not keep pace with the current pace of SLP development and do not fully reflect the state of our ideas about the nature and diversity of speech pathologies studied today. The author uses psycholinguistic approach to the analysis of PSSU, particularly for researching psychological mechanisms of speech associated with the functioning of the anterior and posterior tertiary fields of the dominant hemisphere, their role in the pathogenesis of different variants of motor alleles. This allowed the author to identify 10 separate disorders, 6 of them belonging to PSSU. Author raises the issue of making changes to the existing clinical and pedagogical classification and its coordination with the psychological and pedagogical classification of speech disorders currently used in domestic SLP practice. In particular, the author argues the necessity of introduction of speech disorders like apraxia and dyspraxia as separate nosologies into the classification as one of the variants of sound disorders; paraalalia as a separate form of PSSU and two variants of general speech underdevelopment with a predominant disorder in the assimilation of syntagmatic and paradigmatic organization of language signs, previously referred to as general speech underdevelopment of unknown etiology.