Brain cells or neurons can recognise whole faces, not their parts, enabling us to tell friends from strangers or a sad from a happy face. "The finding really surprised us," said Ueli Rutishauser, study co-author, neuroscientist and visitor at the biology division of California Institute of Technology (Caltech).
http://www.ummid.com/news/2011/October/02.10.2011/brain_cells_face_recog.htm
http://www.ummid.com/news/2011/October/02.10.2011/brain_cells_face_recog.htm
