Table 2.

Related work on emotion recognition.

Author	Modality	Method	Emotion Classification
Kudiri [11]	Facial Expression, Speech	SVM	8 classes (anger, sadness, happiness, boredom, disgust, fear, surprise, neutral)
Wollmer [12]	Facial Expression, Speech	BLSTM, HMM, SVM	2 classes (valence, activation)
Chen [17]	Facial Expression, Speech, Body Gestures	SVM, RF, LR	7 classes (anger, sadness, happiness, disgust, fear, neutral)
Gunes [13]	Facial Expression, Body Gestures	BN	6 classes (disgust, happiness, fear, anger, anxiety, uncertainty)
Wagner [14]	EMG, ECG, SC, PSP	kNN, LDF, MLP	4 classes (anger, sadness, joy, pleasure)
Ko [18]	EEG	BN	5 classes (joy, anger, neutral, sadness, surprise)
Alm [19]	Text	NLP	2 classes (positive, negative)
Soleymani [15]	Video, audio, text	BN	3 classes (calm, positive excited, negative excited)