I have sometimes experienced that sometimes, when I close my eyes and am thinking about something or repeating(visualizing) some memories in my mind and get totally absorbed in thoughts ,and all of the sudden if someone bang the door, or make some other loud sound, immediately at the same moment ,on my mind screen something like flash or lines similar to the lines on the TV screen (when not receiving picture ) appear upon my mind screen for a second or lesser time.

I want to know if somebody else have the similar experience, and can explain the scientific reason?

mab

when in deep reverie the brain waves alter (usualy an Alpha patern) when startled, this shifts and the blood pressure alters too, as well as some adrenaline being released.

this can present an "Image" or illusion of one, and sometimes a feeling like an electric shock.

 

I`m no expert in this field however. Glider would really be the one to ask.