Abstract
Friedreich ataxia, an autosomal recessive mitochondrial disease, is the most frequent inherited ataxia. Many studies have attempted to identify cognitive and affective changes associated with the disease, but conflicting results have been obtained, depending on the tests used and because many of the samples studied were very small. We investigated personality and neuropsychological characteristics in a cohort of 47 patients with genetically confirmed disease. The neuropsychological battery assessed multiple cognition domains: processing speed, attention, working memory, executive functions, verbal memory, vocabulary, visual reasoning, emotional recognition, and social cognition. Personality was assessed with the Temperament and Character Inventory, and depressive symptoms were assessed with the Beck Depression Inventory. We found deficits of sustained attention, processing speed, semantic capacities, and verbal fluency only partly attributable to motor deficit or depressed mood. Visual reasoning, memory, and learning were preserved. Emotional processes and social cognition were unimpaired. We also detected a change in automatic processes, such as reading. Personality traits were characterized by high persistence and low self-transcendence. The mild cognitive impairment observed may be a developmental rather than degenerative problem, due to early cerebellum dysfunction, with the impairment of cognitive and emotional processing. Disease manifestations at crucial times for personality development may also have an important impact on personality traits.
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Acknowledgments
This study is an ancillary substudy of EFACTS (European Friedreich Ataxia Consortium for Translational Studies -www.e-facts.eu, NCT02069509) coordinated by M. Pandolfo. We thank the participants for their patience, and Aurelie Guignebert, Martine Frischmann, and Mathieu Anheim for fruitful initial discussions.
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All procedures performed in studies involving human participants were carried out in accordance with the ethical standards of the institutional and/or national research committee and the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Sabrina Sayah and Jean-Yves Rotgé are joint first authors.
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Sayah, S., Rotgé, JY., Francisque, H. et al. Personality and Neuropsychological Profiles in Friedreich Ataxia. Cerebellum 17, 204–212 (2018). https://doi.org/10.1007/s12311-017-0890-5
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DOI: https://doi.org/10.1007/s12311-017-0890-5