Akifumi Takahashi

Akifumi Takahashi
The University of Tokyo | Todai

Doctor of Philosophy

About

30
Publications
1,864
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157
Citations

Publications

Publications (30)
Article
Full-text available
Various methods for inducing an illusory force sensation to present a sense of force to users in energy-saving and space-saving systems have been proposed. One of them is the illusion of force sensation induced by cutaneous sensory stimulation. In this study, we hypothesized and empirically verified that lateral skin stretch alone on the face can i...
Chapter
Full-text available
When an object that is grasped with a finger is pulled by an external force, the traction force is perceived by cutaneous receptors and proprioception in the finger. Several attempts have been made to simulate the pulling sensation by using wearable devices, including mechanical asymmetric vibration and tightening by belt. In this study, we develop...
Chapter
Full-text available
We proposed to use kinesthetic illusion to achieve wearable/portable haptic devices for kinesthetic feedback in VR experiences. The kinesthetic illusion is the illusion of limb movement typically induced by vibratory stimulation. We investigated how the kinesthetic illusion affected the perceived weight and resistance of the handheld object. We des...
Article
The purpose of this study was to investigate whether stimulation of the proprioceptors in the arm during active movement can affect not only the proprioception of the arm but also the perception of the hand-held object. If it is possible to control the perception of a hand-held object through stimulation to the body, it can be applied to virtual-re...
Article
Full-text available
Many wearable interfaces have been proposed to present force to the upper limb and elbow joint. One way to achieve a compact wearable haptic interface is to use electrical stimulation, and we have suggested that transcutaneous electrical stimulation above the wrist tendon can produce force a sensation in the direction of the muscle stretching; howe...
Article
Presenting kinesthetic sensation usually requires a large space so as to avoid users colliding with objects or other users. One way to tackle this issue to use kinesthetic illusion, which is a way of presenting kinesthetic sensation without physical motion. However, realizing dynamic motion and fast movement remains difficult. Considering that mult...
Article
In the present virtual reality systems, because users must move their physical body, there are problems in safety, cost and accessibility. In order to solve these problems, we have proposed a system that creates sense of movement without physical movement of user’s body using kinesthetic illusion induced by tendon vibration. In this paper, we condu...
Chapter
Full-text available
In current virtual reality (VR) systems, the physical movement of the body is required, which creates problems of safety, cost, and accessibility. To solve those problems, we propose a system that fixes a user’s body, detects force when a user tries to move, and generates the sensation of movement using kinesthetic illusion caused by tendon vibrati...
Chapter
Full-text available
Kinesthetic sensation is important for improving presence and immersion in VR environments. However, presenting kinesthetic sensation usually requires a large space so as to avoid users colliding with objects or other users. One of the ways to tackle this issue is to use kinesthetic illusion, which is a way of presenting kinesthetic sensation witho...
Conference Paper
We developed a high-density tactile vest that presents the haptic sensation of the five fingertips to the back rather than to the fingertip as a new haptic presentation method for objects in a virtual reality (VR) environment. The device adopts 144 eccentric mass vibration motors actuated individually and five Peltier elements. The voice coils pres...
Conference Paper
The kinesthetic sensation is important in terms of creating presence in virtual reality applications. One possible way of presenting the kinesthetic sensation with compact equipment is to use the kinesthetic illusion, which is an illusion of position and movement of the one’s own body, generated by vibration. However, the kinesthetic illusion obser...
Conference Paper
Naturalistic tactile sensations can be elicited by mechanical stimuli because mechanical stimulations reproduce natural physical phenomena. However, a mechanical stimulation that is too strong may cause injury. Although electrical stimulation can elicit strong tactile sensations without damaging the skin, it is inferior in terms of naturalness. We...
Article
Full-text available
The quantification of stickiness experienced upon touching a sticky or adhesive substance has attracted intense research attention, particularly for application to haptics, virtual reality, and human–computer interactions. Here, we develop and evaluate a device that quantifies the feeling of stickiness experienced upon touching an adhesive substanc...
Article
Full-text available
Background Our previous studies have shown that electrical stimulation from the skin surface to the tendon region (Tendon Electrical Stimulation: TES) can elicit a force sensation, and adjusting the current parameters can control the amount of the sensation. TES is thought to present a proprioceptive force sensation by stimulating receptors or sens...
Conference Paper
Naturalistic tactile sensations can be elicited by mechanical stimuli because mechanical stimulation reproduces a natural physical phenomenon. However, a mechanical stimulation that is too strong may cause injury. Although electrical stimulation can elicit strong tactile sensations without damaging the skin, electrical stimulation is inferior in te...
Conference Paper
Full-text available
A method to present force sensation based on electrical stimulation to the tendon has been suggested, and the occurrence of the sensation was considered due to the contribution of proprioceptors such as Golgi tendon organs. However, there was no clear evidence about the contributing receptors and because the method uses percutaneous electrical stim...
Conference Paper
This demonstration corresponds to our previous paper, which deals with our finding that a proprioceptive force sensation can be presented by electrical stimulation from the skin surface to the tendon region (Tendon Electrical Stimulation: TES). We showed that TES can elicit a force sensation, and adjusting the current parameters can control the amo...
Conference Paper
Full-text available
In this study we developed and evaluated device for the quantitative measurement of stickiness. While typical pressure distribution sensor can measure the pressing force, it cannot measure the tensile force. Hence, we installed a pin array on the sensor, which gives offset pressure to the sensor by its weight. We also show some result of measuring...
Conference Paper
Most haptic devices have the common problem of requiring a large hardware setup, because they must present actual force. To cope with this issue, we have proposed a method to present force sensation using tendon electrical stimulation. In this paper, we investigated whether it is possible to present force sensation by electrically stimulating the t...
Conference Paper
We developed a novel musical entertainment system ‘HapTONE’ that draws on auditory, tactile, and visual senses. HapTONE presents players with high-fidelity vibrotactile sensations, not only after a key on pressing the keyboard but also during the actual process of pressing the key itself. HapTONE is composed of eight key units that is composed of a...

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