Masakatsu Tsukamoto, Hiroyuki Kambara, Natsue Yoshimura, Yasuharu Koike
Biological signals are studied for a biometrics. Their studies aim at using an individual information included in biological signals. If biological signals are measured even once, there is a risk that it is hard to reject another person liked a fingerprint. We propose a biometric technique using a musculo-skeletal model without storing both physical characteristics and behavioral characteristics. This technique is robust against the skimming of characteristics. We make the musculo-skeletal model by surface electromyogram and finger motions. We show a significant difference between the person...
TC18 Symposium 2013
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· 2013
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Yasuhiko Nakanishi, Takafumi Yanagisawa, Duk Shin, Chao Chen, Hiroyuki Kambara, Natsue Yoshimura, Masayuki Hirata, Toshiki Yoshimine, Yasuharu Koike
Electrocorticogram (ECoG), which is less invasive than intracotical microwire, has higher spatiotemporal resolution than EEG. Although a number of studies have predicted three dimensional (3D) trajectories of monkeys’ arm with ECoG signals, those of human arms are not available yet as far as we know. In this study, we applied ECoG to a patient suffering from thalamic hemorrhage and predicted his 3D arm trajectories (4 joint angles and 6 coordinates at arm joints). He performed tasks of rotating three objects clockwise on a table. As results of leave-one-out cross-validation (LOO-CV), average...
TC18 Symposium 2013
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Duk Shin, Chao Chen, Yasuhiko Nakanishi, Hiroyuki Kambara, Natsue Yoshimura, Hidenori Watanabe, Atsushi Nambu, Tadashi Isa, Yukio Nishimura, Yasuharu Koike
Electrocorticogram (ECoG) has drawn attention as an effective recording approach for less invasive brain-machine interfaces (BMI). Previous studies succeeded in classifying the movement direction or velocity from ECoGs. Despite such successful studies, there still remain considerable works for the purpose of realizing an ECoG-based BMI robot. Our previous study suggested and verified the method to predict multiple muscle activities from ECoG measurements. In this article, we predicted 4 DOF angle of arm from muscle activities decoded from ECoG signals. We also controlled 4 DOF robot arm...
TC18 Symposium 2013
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Can Ekici
Thermal comfort can be described as satisfaction of the mind in an environment. In this satisfied environment, physical and mental productivity of human become higher. For many years, humankind endeavor to develop more comfortable environments. On that way; thermal comfort equation was established by P. O. Fanger in 1970s. “Fanger’s comfort equation” is the combined quantitative combination of the environmental and individual variables. Predicted Mean Vote (PMV), as the result of “Fanger’s comfort equation”, indicates how the occupants judge the climate. Using PMV, the Percentage of People...
TC18 Symposium 2013
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Hiroyuki Kambara Duk Shin Toshihiro Kawase Natsue Yoshimura, Yasuharu Koike
The perception of an object’s heaviness is not only dependent on its weight. It is well known that spatial information of an object, such as size, can easily deceive our perception of its heaviness. To further understand neural mechanism underlying weight perception, we investigated effects of temporal information on the weight perception. We conducted experiments in which a falling ball is displayed on a screen and load force of the ball is exerted on the hand by a haptic device. By shifting the timing of load force exertion away from visual contact timing (i.e., time when the ball hit the...
TC18 Symposium 2013
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A. De Luca, H. Vernetti, P. Giannoni, C. Lentino, G. A. Checchia, D. De Santis, P. Morasso, M. Casadio
The goal of this study is to provide a quantitative evaluation of a specific therapeutic maneuver used by physical therapists for improving core stability of stroke survivors. The maneuver is a simple, bilateral touch with light pressure on the low back muscles, applied to the subjects, while sitting on a force platform. Functional improvements were measured by looking at reaching movements with the unimpaired arm, motion of the center of pressure, and muscle activity. Preliminary results show that the maneuver induces a radical reorganization of the subjects posture, consisting of a...
TC18 Symposium 2013
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Takahiro Kagawa, Yoji Uno
In this study, we analyzed the transient phase of reactive responses for balance recovery while walking. A cyclic EMG pattern during steady-state walking is regarded as a closed orbit in the state space of EMG signals. Since a disturbance induces a different pattern of EMG from the orbital EMG pattern, the distance between the orbit and the reactive EMG after disturbance is quantified by nearest neighbor distance. In addition, we evaluated the time series of the phase of the minimum distance which would reflect the modulation of locomotor rhythm for balance control.
TC18 Symposium 2013
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Dalia De Santis, Jacopo Zenzeri, Pietro Morasso
This study describes pilot experiments of haptic reaching, namely movements aimed at a target in the absence of vision, via haptic interaction. A manipulandum generates a convergent force field which transmits the direction of the target to the subject. The field has a very low intensity, close to the perceptual threshold, and it is pulsed in time, with a smooth profile (0.2 s duration) and a repetition rate of 2 pulses/s. In particular, we developed and tested a novel method for evaluating the degree of active participation to this haptic interaction which may find application in robot...
TC18 Symposium 2013
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Dalia De Santis, Jacopo Zenzeri, Pietro Morasso
Haptic augmented feedback was found to enhance motor learning in healthy as well as impaired subjects. This pilot study describes experiments of haptic reaching, namely movements aimed at a target in the absence of vision, via haptic interaction. We provided healthy subjects with two types of force feedback, continuous in time vs. intermittent, directed towards 7 different target locations on a plane through a manipulandum. In particular, we sought for differences in force direction perception in the two force conditions and between the right and left arm. The results suggest that the new...
TC18 Symposium 2013
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L. Pellegrino, M. Saiano,, M. Casadio, S. Summa, E. Garbarino, V. Sanguineti
Persons with Autism Spectrum Disorder (ASD) exhibit an impairment in social interaction capabilities. The main objective of the study is to explore the interaction with virtual environments (VE) by natural interfaces (NI) as a way to facilitate the acquisition of social skills. The study involved a total of four subjects with ASD. After an initial assessment of their basic skills and a familiarization phase with the VE and NI, participants performed 3 exercise sessions of 45 minutes each, with increasing levels of difficulty. During each session, participants completed two different paths in...
TC18 Symposium 2013
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