Table 7.

Accuracy comparison of different studies

Reference	DEAP dataset and	Classifier	No.	Accuracy	Accuracy
	feature		channels	(Valence) (%)	(Arousal) (%)
[25] (2014)	Raw data bandpower feature of 4 frequency bands	SVM (32-fold cross-validation of 32 subjects)	10	64.90	64.90
[22] (2016)	Raw data and individula normalization Entropy and Energy of gamma frequency band	KNN (10-fold cross-validation of all samples)	10	86.75	84.05
[11] (2016)	Preprocessed data statistical features, band power, Hjorth parameters and fractal dimension	SVM (8-fold cross-validation of all samples)	14	73.14	73.06
[10] (2016)	Preprocessed data power ratio, power spectral density, entropy, Hjorth parameters and correlation	ANN (leave-one-out cross- validation of each subject)	18	72.87	75.00
[8] (2016)	Preprocessed data PSD and DE	SVM (90% for training and 10% for testing of all samples)	32	85.20	80.50
[18] (2016)	Raw data Narrow-band PSD	DBN (5-fold cross-validation of each subject)	32	88.59	88.33
Our research (2018)	Preprocessed data and channel normalization Entropy and Energy of gamma frequency band	KNN (10-fold cross-validation all samples)	10	89.54 $\pm$ 0.81	89.81 $\pm$ 0.46
			14	92.28 $\pm$ 0.62	92.24 $\pm$ 0.33
			18	93.72 $\pm$ 0.48	93.69 $\pm$ 0.30
			32	95.70 $\pm$ 0.62	95.69 $\pm$ 0.21