AD	Alzheimer’s disease
aMCI	amnestic mild cognitive impairment
CSF	cerebrospinal fluid
DC	diagnostic confidence
DLB	dementia with Lewy bodies
EEG	electromyography
EMG	electroencephalography
FTD	frontotemporal dementia
GABA	gamma-aminobutyric acid
HC	healthy control
ICF	intracortical facilitation
iRBD	idiopathic REM behavioral disorder
ISI	interstimulus interval
LICI	long interval intracortical inhibition
LTD	long-term depression
LTP	long-term potentiation
MCI	mild cognitive impairment
MCI-AD	mild cognitive impairment due to Alzheimer’s disease
MCI-DLB	mild cognitive impairment due to dementia with Lewy bodies
MCI-FTD	mild cognitive impairment due to frontotemporal dementia
MCI non-AD	mild cognitive impairment not due to Alzheimer’s disease
MCI-other	mild cognitive impairment due to other than AD/FTD/DLB
MD	multiple domain
na-MCI	non-amnestic mild cognitive impairment
PAS	paired associative stimulation
PD	Parkinson‘s disease
PD-MCI	Parkinson’s disease with mild cognitive impairment
PD-RBD	Parkinson’s disease with REM behavioral disorder
PDD	Parkinson‘s disease dementia
PET	positron emission tomography
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
RBD	REM behavioral disorder
rTMS	repetitive transcranial magnetic stimulation
SAI	short-latency afferent inhibition
SD	single domain
SICI	short-interval intracortical inhibition
TBS	theta-burst stimulation
TEP	transcranial magnetic stimulation-evoked potential
TMS	transcranial magnetic stimulation