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. 2015 Mar 10;9(5):509–522. doi: 10.1007/s11571-015-9336-2

Fig. 9.

Fig. 9

The selected features in time−frequency domain (energy wavelet) with KNN (K = 1, the distribution: correlation, and the rule: nearest). 200 features were selected by T-test criterion. The low frequency features at the initial time interval have higher information about the decoding of spatial attention