1. An Observational Study of Cognitive Impairment in Amyotrophic Lateral Sclerosis Rippon, Gregory A.; Scarmeas, Nikolaos; Gordon, Paul H.; Murphy, Peregrine L.; Albert, Steven M.; Mitsumoto, Hiroshi; Marder, Karen; Rowland, Lewis P.; Stern, Yaakov 2006 Articles Amyotrophic lateral sclerosisCognitionFrontotemporal dementiaCognitive neuroscienceDementiaMental healthNeurosciences