Neurobiological Basis of Language Learning Difficulties

Area of Science:

• Neuroscience
• Developmental Psychology
• Speech and Language Pathology

Background:

• Children with language impairment and dyslexia often show deficits in procedural learning tasks.
• These tasks rely on corticostriatal learning circuits, suggesting a role beyond cortical language areas.
• Neuroimaging studies in adults link corticostriatal and hippocampal systems to language learning.

Purpose of the Study:

• To emphasize the importance of investigating subcortical learning systems in children with language impairment and dyslexia.
• To explore the neurobiological underpinnings of these developmental disorders.
• To identify potential targets for intervention.

Main Methods:

• Review of behavioral studies on procedural learning in children with neurodevelopmental disorders.
• Analysis of fMRI studies implicating corticostriatal and hippocampal systems in language learning.
• Examination of structural and functional abnormalities in the striatum of children with language disorders.

Main Results:

• Children with language impairment and dyslexia exhibit poorer performance on procedural learning tasks.
• Corticostriatal and hippocampal networks are implicated in language learning in neurotypical adults.
• Abnormalities in the striatum are observed in children with language disorders.

Conclusions:

• Focusing solely on cortical language areas may overlook crucial subcortical contributions in developmental language disorders.
• Investigating corticostriatal networks offers insights into the neurobiology of language impairment and dyslexia.
• Understanding these networks can inform the development of targeted interventions.