Abstract
Autistic Disorder (AD) is a phenotypically heterogeneous condition characterized by impairments in social interaction, communication, and the presence of repetitive behavior and restricted interests. It is a model syndrome to investigate neural interaction and integration at the nexus of language and social cognition. This paper considers the problems of language acquisition in AD from an evolutionary and ontogenetic context. Following a review of normal language development during the formative years of brain development, we examine what is known about infant linguistic and nonlinguistic precursors of language acquisition in AD and examine how anomalies of several processes relate to language abnormalities manifest by the early elementary school years. Population heterogeneity and practical limitations inherent to the study of children currently limit a comprehensive understanding of the significance of specific neurological abnormalities in relation to observed deficits. However, convergent evidence implicates anomalies of a widely distributed neural network, involving superior temporal sulcus, superior temporal gyrus, supramarginal gyrus, insula, inferior frontal gyrus, hippocampus, amygdala and cerebellum. These anomalies reflect the cumulative effects of genetic, epigenetic and environmental influences. Neuropsychological studies of language in AD provide an important means to define the phenotypic variation resulting from alterations in neural architecture. By mapping broad relationships between key symptoms, neuropsychological impairment and neural substrate, information derived from these studies enable a level of analysis that bridges the gap between the genome and the syndrome. Further study of children during the critical first 2 years of life using behavioral, electrophysiological, and functional neuroimaging methods is essential.
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Stefanatos, G.A., Baron, I.S. The Ontogenesis of Language Impairment in Autism: A Neuropsychological Perspective. Neuropsychol Rev 21, 252–270 (2011). https://doi.org/10.1007/s11065-011-9178-6
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DOI: https://doi.org/10.1007/s11065-011-9178-6