absCPCC	absolute value of complex Pearson correlation coefficient
AD	Alzheimer’s disease
CE	closed eyes
CM	connectivity matrix
CPCC	Complex Pearson correlation coefficient
CT	Computed tomography
DBS	deep brain stimulation
EEG	Electroencephalography
FDA	U.S. Food and Drug Administration
FFT	Fast Fourier transform
GFS	Global Field Synchronization
IR LED	infra-red Light Emitting Diode
imCPCC	imaginary component of complex Pearson correlation coefficient
LED	Light Emitting Diode
MCI	mild cognitive impairment
MEG	Magnetoencephalography
MI	Mutual Information
MMSE	Mini-Mental State Exam
MRI	Magnetic Resonance Imaging
NIR	near-infrared
OE	opened eyes
PBM	photobiomodulation
PLI	Phase Lag Index
PLV	Phase Locking Value
r1	First Recording
r2	Second Recording
TAR	theta-alpha ratio
tDCS	transcranial direct current stimulation
TILS	transcranial infrared laser stimulation
TMS	transcranial magnetic stimulation
tPBM	transcranial photobiomodulation
SAGE	Self Administered Gerocognitive Exam
SCI	subjective cognitive impairment
wPLI	Weighted Phase Lag Index