When I try to imagine face of some persons like relative,friend, celebrities etc. I can visualize them in my mind. I wonder how do brain decide what to show to me in my mind about that person? I might have seen the person at his/her various ages, various dresses, various places. While laughing,talking,crying,quite etc.in various moods. How do brain decide which image to draw in my mind? For example when I imagine actor Tom Cruise whom I saw in various movies at various ages for last 30 years my brain shows him . How brain decide of what age of Tom Cruise, in what dress, in what gesture, in which mood it should represent him to me in my mind? The same goes for all the persons I imagine. While testing such thing I found that the still photos of the persons are generally used by my brain. For this reason for the persons whose photos I don't have at all or never watched I struggle to image a face. However for the persons whom I have met recently or few years ago but never saw any photos of them I can imagine them with less struggle. Though for older time persons with whom I have not met for more than 20 years its too difficult to imagine face. There are so much to discover about our brain.