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International Journal of Neuroscience Volume 120, 2010 - Issue 2
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Research Article

EEG Evidence of Posterior Cortical Disconnection in PD and Related Dementias

Luigi PugnettiScientific Institute S. Maria Nascente, Fondazione don C. Gnocchi, Milan, ItalyCorrespondence[email protected]
,
Francesca BaglioScientific Institute S. Maria Nascente, Fondazione don C. Gnocchi, Milan, Italy
,
Elisabetta FarinaScientific Institute S. Maria Nascente, Fondazione don C. Gnocchi, Milan, Italy
,
Margherita AlberoniScientific Institute S. Maria Nascente, Fondazione don C. Gnocchi, Milan, Italy
,
Elena CalabreseScientific Institute S. Maria Nascente, Fondazione don C. Gnocchi, Milan, Italy
,
Antonio GambiniFaculty of Economy, University of Genoa, Genoa, Italy
,
Enrico Di BellaFaculty of Economy, University of Genoa, Genoa, Italy
,
Massimo GaregnaniScientific Institute S. Maria Nascente, Fondazione don C. Gnocchi, Milan, Italy
,
Laura DeleonardisScientific Institute S. Maria Nascente, Fondazione don C. Gnocchi, Milan, Italy
&
Raffaello NemniScientific Institute S. Maria Nascente, Fondazione don C. Gnocchi, Milan, Italy
 show all
Pages 88-98 | Received 13 Aug 2008, Published online: 03 Mar 2010
 
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ABSTRACT

Electroencephalogram (EEG) reactivity to eyes opening and 12-Hz photic stimulation was investigated in 14 healthy elderly subjects, 21 parkinsonian patients (PD), 7 demented parkinsonian patients (PDD), and 10 patients with Lewy body dementia (LBD) using global field synchronization (GFS). During eyes closed Theta GFS was increased in Parkinson's disease and patients and alpha1 GFS was decreased in LBD subjects. During 12-Hz intermittent photic stimulation (IPS), reactivity of posterior electrodes was decreased in PD and LBD patients. No reactivity was observed in PDD. Results are consistent with a graded posterior cortical disconnection in parkinsonian syndromes and with a model of dopamine-modulated thalamocortical interplay in visual processing.

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