**2.2 EEG pattern in eye blinks**

As we know that the cornea is positively charged and the retina is negatively charged, when there is a movement of the eyes towards upwards due to the bell's phenomenon **Figure 1**, when eyes are closed this will result in the abnormal signals in the frontal electrodes [15]. There is an upward peak then downward peak when eye is

**Figure 1.** *Bell's phenomenon during eye blink.*

#### **Figure 2.**

*Crests and troughs observed at AF3,AF4 electrodes in common reference montage EEG data.*

blinked once, I blinked the eye continuously therefore crist and troughs continuously occurred only at the AF3, AF4 frontal electrodes in the **Figure 2**, this is because of the bells phenomenon when the eyes are closed the cornea moves up due to which there is a change is potential observed near the frontal electrodes, there is an upward peak at the first when the eyes are closed which implies that there is a relative positive potential of AF3/AF4 with the reference electrode and when eyelids opened there is a downward peak which implies that there is a relative negative potential of AF3/AF4 with the reference electrode.
