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Concept
Haptic perception
Summary
Haptic perception (haptόs "palpable", haptikόs "suitable for touch") means literally the ability "to grasp something". Perception in this case is achieved through the active exploration of surfaces and objects by a moving subject, as opposed to passive contact by a static subject during tactile perception.
The term haptik was coined by the German Psychologist Max Dessoir in 1892, when suggesting a name for academic research into the sense of touch in the style of that in "acoustics" and "optics".
Gibson (1966) defined the haptic system as "[t]he sensibility of the individual to the world adjacent to his body by use of his body". Gibson and others further emphasized what Weber had realized in 1851: the close l
between haptic perception and body movement, and that haptic perception is active exploration.
The concept of haptic perception is related to the concept of extended physiological proprioception, according to which when a tool such as a stick is used, perceptual experience is transparently transferred to the end of the tool.
Haptic perception relies on the forces experienced during touch. This research allows the creation of "virtual", illusory haptic shapes with different perceived qualities, which has clear application in haptic technology.
People can rapidly and accurately identify three-dimensional objects by touch. They do so through the use of exploratory procedures, such as moving the fingers over the outer surface of the object or holding the entire object in the hand.
The following exploratory procedures have been identified so far:
Lateral motion
Pressure
Enclosure
Contour following
Thus gathered object or subject properties are size, weight, contour, surface and material characteristics, consistency and temperature. Along with the development of tactile sensors, some work has been dedicated to training robots exploratory procedures.
Perceptual deadband is a region which captures perceptual limitations of human perception. The Weber fraction and the level crossings constant are employed to define the perceptual deadband for haptic force stimulus.
Official source
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