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Previous research has shown that clinicians may make significant errors in distinguishing frontotemporal lobar degeneration (FTLD) from Alzheimer disease (AD) based on visual inspection of preprocessed neuroimages. To examine the source of these errors, researchers used a previously compiled data set of fluorodeoxyglucose positron emission tomography (FDG-PET) scans of 45 patients with autopsy-confirmed FTLD (14 patients) or AD (31 patients). In this study, 10 neurologists and 2 psychiatrists, blinded to clinical history and interpretations of other raters and with varying degrees of expertise in interpreting FDG-PET brain scans, reviewed the scans. Six of the raters also received training highlighting the association of hypometabolism in t…