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. 2018 Sep 29;19:344. doi: 10.1186/s12859-018-2365-1

Fig. 5.

Fig. 5

The sliding window procedure for cropping a trial into time slices. In common, the trial duration used for motor imagery is two seconds, and we obtain 500 samples for a 250 Hz sample rate. If the optimal number of the hidden layers is 20, the original trial will be crop to 480 time slices