Fig. 7From: Classifying blinking and winking EOG signals using statistical analysis and LSTM algorithma EOG measurement of a double wink (DW) showing two peaks and two troughs. b First derivative (FD) of a double wink (DW) showing five tips of two minima and three maxima. c Digitized first derivative (FD) of a double wink (DW) showing three clearly separated values + 1, −1 and zeroBack to article page