Table 3.

Studies on participants with neurological disorders.

Study	Physiological Data Source	Target Emotions	Approach	Validation
[36]	EEG (16 electrodes)	Happiness, Sadness, Fear, Anger, Surprise, and Disgust	SVM and Fuzzy KNN	10-fold cross-validation
[37]	EEG (16 electrodes)	Happiness, Sadness, Fear, Anger, Surprise, and Disgust	SVM and KNN	10-fold cross-validation
[38]	EEG (16 electrodes)	Happiness, Sadness, Fear, Anger, Surprise, and Disgust	SVM	10-fold cross-validation
[40]	GSR and facial	Positive, Neutral, and Negative	ANOVA	-
[41]	EEG (30 electrodes)	Happiness, and Sadness	SVM	Train test split