Evaluation of Pressure-Slippage-Generating Tactile Mouse using Edge Presentation

Abstract

<B>Problem statement:</B> Although a conventional tactile display can generate distributed pressure, our tactile mouse can generate not only distributed pressure but also slippage force. In previous works, this tactile mouse was effective on virtual figure presentation tests. Advanced tests are required to evaluate this tactile display. <B>Approach:</B> To compare virtual reality presented by the present tactile mouse and a real object, we produced an edge presentation apparatus composed of an x-y stage and two rotary stages to compare real feeling with virtual reality. In virtual edge presentation, slippage stimulus of a spike was generated in addition to step-height stimulus when a mouse cursor travels on the virtual edge. <B>Results:</B> In virtual edge presentation, we performed three series of experiments: distributed pressure presentation, combined presentation of distributed pressure and vertical slippage force and combined presentation of distributed pressure and parallel slippage force. In the case of the combined presentation of distributed pressure and parallel slippage force, a human subject’s judgment of edge direction was performed with the highest precision among virtual edge presentation tests.When the human subject touched the real edge orientation presented by the apparatus, the precision became higher than any case of virtual presentation. <B>Conclusion/Recommendations: </B>The combined presentation of distributed pressure and parallel slippage force&nbsp;was&nbsp;effective to present a virtual edge. The pressure-slippage-generating tactile mouse can enhance the degree of reality of a virtual figure

Tactile mouse generating velvet hand illusion on human palm

“…This means that edge inclination recognition is processed beyond the motor cortex. Since the threshold of around 7° is almost the same as the threshold of around 6° obtained from the fingertip 17 using real edges, this tactile display has enough capability for edge presentation. Furthermore, when the edge moving speed is 90 mm/s, the smallest threshold is obtained.…”

Neurophysiology of slip sensation and grip reaction: insights for hand prosthesis control of slippage

“…As regards of noninvasive methods to deliver tactile sensation of slippage, a preliminary investigation on healthy subjects suggested that the stimulation of the finger pad by applying an external force and a 30-Hz vibration distributed from the outer to the inner part of the fingertip contact surface is the most effective to evoke partial slip responses (80). Moreover, systems constituted by a tactile display and actuators capable to provide SF on the contact surface can reproduce tactile sensations similar to those provided by a moving surfaces during full slip phase (162). To elicit phantom slippage sensations in amputees, stimulation should be delivered on the area of the skin where patients refer finger phantom sensations.…”

“…For instance, a device with the dimensions of a PC mouse could reproduce tactile sensations similar to moving edges on finger pad. It was implemented with a two-dimensional electromagnetic-linear motors to present LF in two directions, and a tactile display composed by an array of piezoelectric-actuators to reproduce distributed GF on the pad ( 162 ).…”