Ryota Okuno

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The purpose of the present study was to isolate the length perturbation-evoked force attributed to intrinsic muscle viscoelasticity, and to investigate the relation between muscle viscoelasticity and the level of muscle activation during isometric contraction in five healthy male subjects. A small length perturbation (stretching or contraction) was applied(More)
The purpose of this study was to develop a new type of myoelectrically controlled biomimetic prosthetic hand which has almost the same dynamics as that of the neuromuscular control system of the finger muscles, and in mechanical properties of the muscles and of the stretch reflex. One of the characteristic features of the neuromuscular control system in man(More)
The purpose of this study was to develop a new type of the sensory feedback system for the myoelectrically controlled biomimetic prosthetic hand. One of the characteristic features of the neuromuscular control system in man is an increase in the compliance around the joint, with the decreasing activity of the muscle. For the sensory feedback system the(More)
This paper describes an efficient system for transmitting a few words (verbal information) to a prosthetic hand user by using a two-channel electrotactile stimulation capable of generating apparent movements, which is applied to the upper arm area of the left hand via surface concentric electrodes. If the prosthetic hand user gets verbal information about(More)
We have aimed at developing a sensory substitution system for transmitting verbal information. In this work, we propose a basic two-channel electrotactile stimulation system and examine the usefulness of the system. The verbal information to be provided consists of two items: one is the object and another is the location (direction) of the object in the(More)
The purpose of this study was to measure sarcomere lengths of thick muscle fiber bundles at resting and at isometric tetanic contractions. We developed a novel measurement system using an epi-illumination-type polarization microscope and an image processing algorithm using an ellipse-type Gabor filter. Images with striation patterns of frog skeletal muscle(More)
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