Fig. 3From: Classifying blinking and winking EOG signals using statistical analysis and LSTM algorithma EOG measurement of a single wink (SW) showing one peak and one trough. b First derivative (FD) of a single wink (SW) showing three tips of one minimum and two maxima. c Digitized first derivative (FD) of a single wink (SW) showing three clearly separated values + 1, −1 and zeroBack to article page