While the sense of touch is not restricted to hands, the only part of the body that can rival the concentration and sensitivity of touch receptors in the fingertips is the tongue. Touch can also sense a variety of properties, such as shape, softness, texture, friction, temperature, weight, and movement. In addition, the researchers work on the development of machine and computer haptics. Human-machine haptic interaction. The human sense of touch involves a closed loop system of receptors sensing, transmitting messages to and from the brain, thinking, and manipulating.
Haptic interfaces require a similar system, but one that is electromechanical and computer-based.
Virtual touch Computer haptics software concerned with generating and rendering touchable virtual objects is analogous to computer graphics. The user either grasps a stylus or puts a finger in a thimble and uses them to touch, feel, and manipulate virtual objects within the device's workspace, which can be large enough to require use of a user's entire arm. As the user explores the space, the object's properties become evident. The computing requirements are considerably different than for computer graphics. But humans can sense temporal frequencies at more than 1 kHz by touch and therefore the rendering rates must be on the order of kilohertz.