Quantitative EEG and Cognitive Decline in Parkinson’s Disease

Table 1

Profiles of the studies, which met the inclusion criteria.

Number	Author(s)	Type of the study/setting	Analyzed parameter(s)	Affiliation of the corresponding author
Studies with EEG with 10-20 international system
1	Caviness et al. 2007 [35]	Comparison of 8 PD-D patients versus 16 PD-MCI patients versus 42 PD-NC patients	Relative spectral power	Mayo Clinic, Scottsdale, USA
2	Bonanni et al. 2008 [36]	Observation of 36 LBD patients, 19 PD-D patients without cognitive fluctuations, 16 PD-D patients with cognitive fluctuations, 17 AD patients, and 50 HC	Compressed spectral arrays and relative spectral power	G. d’Annunzio University of Chieti-Pescara, Pescara, Italy
3	Fonseca et al. 2009 [37]	Comparison of 7 PD-D patients versus 10 PD-MCI patients versus 15 PD-NC patients versus 26 HC	Relative and absolute amplitudes	Pontificia Universidade Catolica de Campinas, Campinas, Brazil
4	Kamei et al. 2010 [38]	Comparison of PD patients with executive dysfunction versus 25 PD patients without executive dysfunction	Absolute spectral power	Nihon University School of Medicine, Tokyo, Japan
5	Babiloni et al. 2011 [39]	Comparison of 13 PD-D patients versus 20 AD patients versus 20 HC	Spectral and source analyses	Casa di Cura San Raffaele Cassino, Italy
6	Klassen et al. 2011 [9]	Observation of 106 PD-wD patients	Relative spectral power	Mayo Clinic, Scottsdale, USA
7	Morita et al. 2011 [40]	Comparison of 100 PD patients: 43 with MMSE 28–30 versus 35 with MMSE 24–27 versus 22 with MMSE <24	Absolute spectral power	Nihon University School of Medicine, Tokyo, Japan
8	Pugnetti et al. 2010 [41]	Comparison of 21 PD-wD patients versus 7 PD-D patients versus 10 LBD patients versus 14 HC	Global field synchronization	Scientific Institute of S. Maria Nascente, Milan, Italy
9	Fonseca et al. 2013 [42]	Comparison of 12 PD-D patients versus 31 PD-wD patients versus 38 AD patients versus 37 HC	Absolute spectral power and coherence	Pontificia Universidade Catolica de Campinas, Campinas, Brazil
10	Gu et al. 2016 [43]	Observation of 9 PD-D patients and 17 PD-MCI patients	Relative and absolute spectral power	Nanfang Hospital, Guangzhou, China
11	Caviness et al. 2015 [44]	Observation of 71 PD-wD patients	Relative spectral power	Mayo Clinic, Scottsdale, USA
12	Fonseca et al. 2015 [45]	Comparison of 31 PD-wD patients versus 28 AD patients versus 27 HC	Absolute spectral power and coherence	Pontificia Universidade Catolica de Campinas, Campinas, Brazil
Studies with EEG with 256 channels
13	Bousleiman et al. 2014 [46]	Comparison of 12 PD-NC patients versus 41 PD-MCI patients	Relative spectral power	Hospital of the University of Basel, Basel, Switzerland
14	Zimmermann et al. 2014 [47]	Analysis of 48 PD-wD patients	Median background frequency	Hospital of the University of Basel, Basel, Switzerland
Studies with 151-channel whole-head MEG
15	Bosboom et al. 2006 [48]	Comparison of 13 PD-D patients versus 13 PD-wD patients versus 13 HC	Relative spectral power	VU University Medical Center, Amsterdam, the Netherlands
16	Stoffers et al. 2007 [49]	Comparison of 70 PD-wD patients versus 21 HC	Relative spectral power	VU University Medical Center, Amsterdam, the Netherlands
17	Stoffers et al. 2008 [50]	Comparison of 70 PD-wD patients versus 21 HC	Synchronization likelihood	VU University Medical Center, Amsterdam, the Netherlands
18	Bosboom et al. 2009 [27]	Comparison of 13 PD-D patients versus 13 PD-wD patients	Synchronization likelihood	VU University Medical Center, Amsterdam, the Netherlands
19	Ponsen et al. 2013 [51]	Comparison of 13 PD-D patients versus 13 PD-wD patients	Relative spectral power and phase lag index	VU University Medical Center, Amsterdam, the Netherlands
20	Olde Dubbelink et al. 2013 [52]	Observation of 49 PD-wD patients and 14 HC	Relative spectral power	VU University Medical Center, Amsterdam, the Netherlands
21	Olde Dubbelink et al. 2013 [53]	Observation of 43 PD-wD patients and 14 HC	Phase lag index	VU University Medical Center, Amsterdam, the Netherlands
22	Olde Dubbelink et al. 2014 [33]	Observation of 43 PD-wD patients and 14 HC	Weighted graph and minimum spanning tree	VU University Medical Center, Amsterdam, the Netherlands
23	Olde Dubbelink et al. 2014 [54]	Observation; 63 PD-wD patients	Relative spectral power	VU University Medical Center, Amsterdam, the Netherlands

AD: Alzheimer’s disease; DLB: dementia with Lewy bodies; HC: healthy controls; PD-D: Parkinson’s disease with dementia; PD-MCI: Parkinson’s disease with mild cognitive impairment; PD-NC: Parkinson’s disease with normal cognition; PD-wD: Parkinson’s disease without dementia.