Cognitive and speech-language performance in children with ataxia telangiectasia.

Objective: To describe cognitive and speech-language functioning of patients with ataxia-telangiectasia (A-T) in relation to their deteriorating (oculo)motor function. Design: Observational case series. Methods: Cognitive functioning, language, speech and oral-motor functioning were examined in eight individuals with A-T (six boys, two girls), taking into account the confounding effects of motor functioning on test performance. Results: All patients, except the youngest one, suffered from mild-to-moderate/severe intellectual impairment. Compared to developmental age, patients showed cognitive deficits in attention, (non) verbal memory and verbal fluency. Furthermore, dysarthria and weak oral-motor performance was found. Language was one of the patients' assets. Conclusion: In contrast to the severe deterioration of motor functioning in A-T, cognitive and language functioning appeared to level off with a typical profile of neuropsychological strengths and weaknesses. Based on our experiences with A-T, suggestions are made to determine a valid assessment of the cognitive and speech-language manifestations.