Sleep Stage Classification Using Unsupervised Feature Learning
Figure 6
Learned features of layer 1 for (a) EEG, (b) EOG1, (c) EOG2, and (d) EMG. It can be observed that the learned features are of various amplitudes and frequencies and some resemble known sleep events such as a K-complex or blink artifacts. Only the first 100 of the 200 features are shown here.
