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Can anyone explain

Aparrently I did not habituate to a glabella tap 

Google has told me it means you dont have signs of Parkinsons :D x

Apparently a normal respone to repeated taps on the forehead (glabella, in humans, is the space between the eyebrows) is to blink at first and then to stop blinking. Stopping blinking would be habituating. So you kept blinking? Your neuro would be the one to try to determine why.

All the best.

suppose that's encouraging lol