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Motor cortex inhibitory circuits in dementia with Lewy bodies and in Alzheimer’s disease

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Summary.

To determine whether a peculiar neurophysiological profile may contribute to characterize dementia with Lewy bodies (DLB) vs. Alzheimer disease (AD), we used transcranial magnetic stimulation to examine the excitability of two different inhibitory systems of the motor cortex, short latency intracortical inhibition (SICI) and short latency afferent inhibition (SAI) in 10 patients with DLB, in 13 patients with AD and in 15 healthy subjects. SICI and SAI were significantly reduced in AD patients, while both were not significantly different from the controls in DLB patients. The differential pattern of SICI and SAI exhibited by AD vs. DLB may have diagnostic significance in discriminating DLB from AD. Furthermore, this technique may help to clarify the pathophysiological entity of DLB; since SAI is a cortical phenomenon that depends on central cholinergic activity, our findings suggest that the mechanisms of cholinergic depletion in DLB may be different from that in AD, while normal SICI may reflect a less pronounced dysregulation of the intracortical GABAergic inhibitory circuitries in DLB.

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Nardone, R., Bratti, A. & Tezzon, F. Motor cortex inhibitory circuits in dementia with Lewy bodies and in Alzheimer’s disease. J Neural Transm 113, 1679–1684 (2006). https://doi.org/10.1007/s00702-006-0551-1

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