Table 2.

EEG data are used to classify the emotions of healthier individuals (up to four electrodes).

Investigation	Emotional responses to be targeted	Method	Accuracy	Test
[71]	Happiness, rage, sorrow, fear, relaxation	Support vector machine (SVM)	73.32	Leave-one-out cross-testing
[72]	Engagement, perplexity, dissatisfaction, positive attitude	SVM, k-nearest neighbors (KNN)	95.69	—
[73]	Sorrow, displeasure	Multiclass support vector machine classifier	84.83	—
[70]	Arousal, sensitivity	SVM, K-means	—	—
[67]	Dissatisfaction, satisfaction	KNN	86.73	5-fold cross-testing
[68]	Dissatisfaction, satisfaction	Multilayer perceptron (MLP)	79.98	5-fold cross-testing
[69]	Boredom, frustration	Analysis	—	—