What is haptic illusion? ▻ Haptic illusions are illusions that exploit the sense of
touch. ▻ Some touch illusions require active touch (e.g., movement of the fingers
...
Haptic Illusions (using Multiple Actuators) in Wearable Devices Muhammad Qasim
Contents
Introduction Working Applications Conclusion References
What is haptic illusion?
Haptic illusions are illusions that exploit the sense of touch. Some touch illusions require active touch (e.g., movement of the fingers or hands), whereas others can be evoked passively (e.g., with external stimuli that press against the skin).
How Haptic Illusion works/feels?
It can be described by understanding cutaneous rabbit illusion, in which a sequence of taps at two separated skin locations results in the perception that intervening skin regions were also tapped.
Video
Surround Haptics by
Tactile Illusions Tactile illusions are perceptual phenomena that arise when two or more vibrating devices or actuators are placed on human skin. These actuators could be pager motors, speakers, soleniods, militarty-grade voice coils, or any other vibrating device. Indeed, the tactile illusions are fundamental properties of human tactile perception and do not depend on type of tactile actuators. In Surround Haptics mainly two tactile illusions are exploit :
Apparent Tactile Motion illusion
Two vibrotactile stimuli are placed on skin in close proximity and their actuation times are overlapped, as shown in figure below. The user would perceive not two actuators, but rather a single virtual actuator moving between physical vibrating points.
Phantom Tactile Sensation illusion
A simultaneous stimulation of two vibrating actuators placed in close proximity would create an illusory vibrating actuator located between the real actuators. Unlike apparent motion, the phantom illusion is static and no motion is perceived.
Tactile Brush Algorithm (Drawing on Skin with Tactile Brush)
Apparent tactile motion illusion is used to produce continuous tactile motion between any two points on the actuator grid. For example, we can draw a tactile stroke by sequentially vibrating actuators along the horizontal row.
Tactile Brush Applications
The algorithm is universal in that it treats tactile grids as a generic content-rendering platform, independent from the specific mechanical and electrical properties of the tactile actuators used.
Applications:
Movies Wearable Haptics and Navigation Gaming Controllers
Movies
By combining hi-fidelity moving tactile sensations on user body with three-dimensional visuals and sound we can dramatically increases the sense of immersion and realism, create the illusions of being present inside of the story.
Hardware would be embedded inside of chairs in movie theaters or ride vehicles in parks or in vests or jackets.
Wearable Haptics and Navigation
It can be also wearable and by combining them with location-based services, they can provide navigation cues for motorcycle or bicycle riders or persons with limited vision.
Hardware would be embedded in vests, jackets, belts and so on.
Gaming Controllers
An array of small actuators embedded in hand-held controller can display various dynamic tactile effects when user is interacting with virtual objects.
Hardware could be embedded into hand-held controllers, vests or chairs.
Own idea as an application
Learning Martial Arts especially Karate
Conclusion
Haptic illusion is an emerging field. It can be used in enhancing the perception of flying or falling, of shrinking or growing, of feeling bugs creeping on your skin. The possibilities are endless.
References
http://en.wikipedia.org/wiki/Tactile_illusion http://en.wikipedia.org/wiki/Cutaneous_rabbit_illusion http://www.disneyresearch.com/project/surround-hapticstactile-brush-algorithm/ http://www.youtube.com/watch?v=Mith4TPLrb4
Thank You
Questions & Comments
