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Amyotrophic lateral sclerosis; motor neuron disease; neuropsychology; learning; memory The Corresponding Author grants on behalf of all authors an exclusive license on a worldwide basis to the BMJ Publishing Group Ltd and its Licensees to permit this article to be published in the Journal of Neurology, Neurosurgery and Psychiatry editions and any other BMJPGL products to exploit all subsidiary rights, as set out in the license