The congenital deafness refers to a condition in which a person is born with a partial or total loss of hearing. This form of deafness it can be caused by genetic defects, viral infections bacterial or contracted from the mother during pregnancy, trauma to the head of the mother during pregnancy, or other factors that affect the development of the inner ear of the fetus. People with congenital deafness may have difficulty in perceiving the sounds and to communicate through the spoken word. You can use the Italian sign Language (LIS) or other alternative communication systems to interact with others, and may require the assistance of specialists, audiologists, medical or rehabilitation to improve their quality of life. Learning LIS or other languages visual-spatial may be particularly important for people with congenital deafness, because it can provide a way to express themselves and communicate with the surrounding world.