Face-identification ability is specific.7,8,9,10 Humans have a specific face identification area of the brain, known in research as the FFA: the Fusiform Face Area.7,8,11 The FFA is in the right hemisphere of the brain. Prior to the age of two, the two hemispheres don’t communicate through the corpus callosum as completely as they will later.7 The left eye early on, then, provides the vast majority of the visual input to the right hemisphere. Later on communication between the hemispheres increases.
Visual neurology – all neurology – requires the correct or appropriate input to develop. Block the proper stimulus that would drive neural development of specific areas at a time of rapid neural growth, and development of the neural network involved is impaired.