Brain Advance Access originally published online on February 4, 2004
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Brain, Vol. 127, No. 3, 628-649, 2004
© 2004 Guarantors of Brain
doi: 10.1093/brain/awh075
What’s in a name: voxel-based morphometric analyses of MRI and naming difficulty in Alzheimer’s disease, frontotemporal dementia and corticobasal degeneration
Departments of 1 Neurology and 2 Radiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
Correspondence to: Murray Grossman, Department of Neurology, 2 Gibson Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104–4283, USA E-mail: mgrossma{at}mail.med.upenn.edu
Confrontation naming is impaired in neurodegenerative conditions like Alzheimer’s disease (AD), frontotemporal dementia (FTD) and corticobasal degeneration (CBD). Some behavioural observations suggest a common source of impaired naming across these patient groups, while others find partially unique patterns of naming difficulty. We hypothesized that a large-scale neural network underlies naming, and that patterns of impaired naming in AD, FTD and CBD reflect cortical atrophy that interrupts this network in a manner that is partially shared and partially unique across these patient groups. We tested this hypothesis by correlating naming impairments with voxel-based morphometric (VBM) analyses of cortical atrophy in structural MRIs of 50 patients. We found significant naming deficits in all patient groups. Naming also correlated with lexical retrieval in all patient groups, including subgroups of patients with FTD. VBM analyses showed significant cortical atrophy, which was shared across AD, FTD and CBD patients in the left lateral temporal cortex; this area correlated with naming accuracy in all groups. Left lateral temporal atrophy thus appears to interfere with a lexical retrieval component of naming in AD, FTD and CBD. Impaired naming also correlated with semantic memory and visual perceptual–spatial functioning in specific groups of patients and, correspondingly, naming correlated with cortical atrophy in partially distinct neuroanatomical distributions in AD, FTD, CBD and subgroups of patients with FTD. These partially unique correlation profiles appear to reflect selective interruption of other components of the naming process, including semantic and visual perceptual–spatial functioning. These findings are consistent with the hypothesis that a large-scale neural network supports naming, and that this network is interrupted in several distinct ways in patients with neurodegenerative diseases.
Key Words: Alzheimer’s; frontotemporal; corticobasal; naming; cortical atrophy
Abbreviations: AD= probable Alzheimer’s disease; CBD = corticobasal degeneration; FTD = frontotemporal dementia; MMSE = Mini-Mental State Examination; NON-APH = non-aphasic patients with frontotemporal dementia; ns = not significant; PNFA = progressive non-fluent aphasia; ROI = region of interest; SD = semantic dementia; VBM = voxel-based morphometry
Received June 23, 2003. Accepted November 4, 2003.
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