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It is increasingly recognized that the correlation between neuropathological lesions and cognition is modest and accounts for about a quarter of the variance of cognition among older adults. Some individuals maintain normal cognitive functioning amidst significant brain pathology, while others suffer varying degrees of cognitive and neurological(More)
The present study investigated two forms of implicit learning in patients with corticobasal syndrome (CBS): contextual cueing and sequence learning. The former primarily implicates the medial temporal lobe system, and the latter, fronto-striatal-cerebellar circuits. Results revealed relatively preserved contextual cueing in patients with CBS. By contrast,(More)
OBJECTIVE To investigate the combined ability of hippocampal volumes, 1H magnetic resonance spectroscopy (MRS) metabolites, and cerebrovascular disease to predict the risk of progression to dementia in mild cognitive impairment (MCI). METHODS We identified 151 consecutively recruited subjects with MCI from the Mayo Clinic Alzheimer's Disease Research(More)
Although it is established that apolipoprotein E (APOE) e4 allele increases the risk of Alzheimer's disease (AD), epidemiological studies indicate that genetic risk decreases late in life. This raises the question of whether the effects of APOE on cognition that are seen in midlife arise from a cognitive phenotype of APOE or from the presence of early AD in(More)
Previous studies using simple, repeating patterns have suggested that the knowledge gained in early sequence learning is not effector-specific in that it transfers to muscle groups other than those used during training. The current experiments extended these findings to transfer after extensive practice with probabilistic sequences using a task on which(More)
The goals were to investigate implicit learning in mild cognitive impairment (MCI), and to determine the relations of implicit learning systems to apolipoprotein E (ApoE) genotype in healthy controls. Elderly controls grouped by ApoE status (ApoE-e4 allele carriers versus ApoE-e4 allele non-carriers) and MCI patients participated in the study. Individuals(More)
OBJECTIVE To compare logistic and bilogistic models to describe the pattern of cognitive decline in the preclinical phase of Alzheimer disease (AD). METHODS We conducted mixed effects modeling of Mayo Cognitive Factors Scores to determine the longitudinal pattern of cognitive decline in the period 10 years prior to and 5 years following a clinical(More)
BACKGROUND The correlation between neuropathological lesions and cognition is modest. Some individuals remain cognitively intact despite the presence of significant Alzheimer's disease (AD) pathology, whereas others manifest cognitive symptoms and dementia in the same context. The aim of the present study was to examine cognitive and cerebral reserve(More)
The authors investigated neuropsychiatric features in 36 pathologically confirmed cases of corticobasal syndrome. Depression, compulsive behavior, and frontal lobe-type behavioral alterations were noted in eight patients (22%). No patient experienced visual hallucinations. If confirmed by a prospective study, the absence of visual hallucinations may help to(More)
BACKGROUND Although it is now evident that normal cognition can occur despite significant AD pathology, few studies have attempted to characterize this discordance, or examine factors that may contribute to resilient brain aging in the setting of AD pathology. METHODS More than 2,000 older persons underwent annual evaluation as part of participation in(More)