Abnormal cortical neural synchronization mechanisms in quiet wakefulness are related to motor deficits, cognitive symptoms, and visual hallucinations in Parkinson's disease patients: an electroencephalographic study

Claudio Babiloni, Maria Teresa Pascarelli, Roberta Lizio, Giuseppe Noce, Susanna Lopez, Marco Rizzo, Raffaele Ferri, Andrea Soricelli, Flavio Nobili, Dario Arnaldi, Francesco Famà, Francesco Orzi, Carla Buttinelli, Franco Giubilei, Marco Salvetti, Virginia Cipollini, Laura Bonanni, Raffaella Franciotti, Marco Onofrj, Paola StirpePeter Fuhr, Ute Gschwandtner, Gerhard Ransmayr, Dag Aarsland, Lucilla Parnetti, Lucia Farotti, Moira Marizzoni, Fabrizia D'Antonio, Carlo De Lena, Bahar Güntekin, Lutfu Hanoğlu, Görsev Yener, Derya Durusu Emek-Savaş, Antonio Ivano Triggiani, John Paul Taylor, Ian McKeith, Fabrizio Stocchi, Laura Vacca, Harald Hampel, Giovanni B. Frisoni, Maria Francesca De Pandis, Claudio Del Percio

Research output: Contribution to journalArticle


Compared with Alzheimer's disease (AD), Parkinson's disease (PD) shows peculiar clinical manifestations related to vigilance (i.e., executive cognitive deficits and visual hallucinations) that may be reflected in resting-state electroencephalographic rhythms. To test this hypothesis, clinical and resting-state electroencephalographic rhythms in age-, sex-, and education-matched PD patients (N = 136) and Alzheimer's disease patients (AD, N = 85), and healthy older participants (Nold, N = 65), were available from an international archive. Electroencephalographic sources were estimated by eLORETA software. The results are as follows: (1) compared to the Nold participants, the AD and PD patients showed higher widespread delta source activities (PD > AD) and lower posterior alpha source activities (AD > PD); (2) the PD patients with the most pronounced motor deficits exhibited very low alpha source activities in widespread cortical regions; (3) the PD patients with the strongest cognitive deficits showed higher alpha source activities in widespread cortical regions; and (4) compared to the PD patients without visual hallucinations, those with visual hallucinations were characterized by higher posterior alpha sources activities. These results suggest that in PD patients resting in quiet wakefulness, abnormalities in cortical neural synchronization at alpha frequencies are differently related to cognitive, motor, and visual hallucinations. Interestingly, parallel PD neuropathological processes may have opposite effects on cortical neural synchronization mechanisms generating cortical alpha rhythms in quiet wakefulness.

Original languageEnglish
JournalNeurobiology of Aging
Publication statusAccepted/In press - Jan 1 2020



  • Exact low-resolution brain electromagnetic source tomography (eLORETA)
  • Mini-Mental State Evaluation (MMSE)
  • Parkinson's disease (PD)
  • Resting-state electroencephalographic (rsEEG) rhythms
  • Unified Parkinson Disease Rating Scale-III (UPDRS III)
  • Visual hallucinations

ASJC Scopus subject areas

  • Neuroscience(all)
  • Ageing
  • Clinical Neurology
  • Developmental Biology
  • Geriatrics and Gerontology

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