Abbreviations	Definition
HMDs	head-mounted devices
VR	virtual reality
SSQ	simulator sickness questionnaire
MSSQ	motion sickness susceptibility questionnaire
ANS	autonomic nervous system
HR	heart rate
SKT	skin temperature
GSR	galvanic skin response
RR	respiration
BP	blood pressure
CNS	central nervous system
EEG	electroencephalogram
fMRI	function-al magnetic resonance imaging
ECG	electrocardiogram
PPG	photoplethysmography
IR	infrared
CED	circular edge detection
FFT	fast Fourier transform
PRC	pupillary rhythm coherence
ANCOVA	analysis of covariance
LDA	linear discriminant analysis
DT	decision tree
SVM	support vector machine
RBF-SVM	radial basis function kernel-SVM
AUC	area under the curve
ROC	receiver operating characteristics
HRPs	heart rhythm patterns
LE–NC	locus coeruleus–norepinephrine
DAN	dorsal attention network
LCD	liquid crystal display
EOG	electrooculography
COP	center of pressure in force plate
PCA	principal component analysis
SONFIN	self-organizing neural fuzzy inference network