Human-computer interface technologies for the motor impaired

Technology has resulted in our ability to control machines for improving our lives. However, large number of people around the world are unable to use the conventional machine interface devices due to injury, disease, or simply weakness due to aging. This chapter introduces the reader to the requirement and the fundamental concept of human-computer interface (HCI) and lists the different modalities that are available. The different applications of each modality have been discussed and it introduces the reader to the next nine chapters.