Fig. 6From: Classifying blinking and winking EOG signals using statistical analysis and LSTM algorithma EOG measurement of an intentional long blink (ILB) showing one peak. b First derivative (FD) of an intentional long blink (ILB) showing two tips of one minimum and one maximum. c Digitized first derivative (FD) of an intentional long blink (ILB) showing three clearly separated values + 1, −1 and zeroBack to article page