Line-of-Sight Detection Using Center of Gravity with Pixel Number Variation

2017 ◽  
Vol 5 (3) ◽  
pp. 64-76
Author(s):  
Takahito Niwa ◽  
Ippei Torii ◽  
Naohiro Ishii
Keyword(s):  
Involuntary Movement ◽  
Center Of Gravity ◽  
The Body ◽  
Movement Direction ◽  
Line Of Sight ◽  
Number Variation ◽  
Blink Detection ◽  
Handicapped People ◽  
Institute Of Technology ◽  
Physically Handicapped

This study is developed from the application software, called “Eyetalk” which supports communication for handicapped people studied by Torii laboratory, Aichi Institute of Technology and modified it to be used by the physically handicapped people with involuntary movement (Abnormal movement of the body that occurs independently of the consciousness). Then, the line-of-sight for the detection of the eye movement direction is developed for the communication to determine whether the user is looking left or right, which is based on the computation of the center of gravity with pixel number in the eye image. Further, a newly proposed blink detection method using afterimage is applied to the developed system. This study will be extended to the application that everyone can use easily and quickly to express his/her thoughts and requests.

General Perspectives on Electromyography Signal Features and Classifiers Used for Control of Human Arm Prosthetics

2019 ◽  
pp. 1-17
Author(s):  
Faruk Ortes ◽  
Derya Karabulut ◽  
Yunus Ziya Arslan
Keyword(s):  
Human Body ◽  
Assistive Technologies ◽  
The Body ◽  
Body Parts ◽  
Daily Lives ◽  
Signal Features ◽  
Human Arm ◽  
Handicapped People ◽  
Physically Handicapped

Physically handicapped people encounter various kinds of obstacles and difficulties in their daily lives due to the restricted ability of motion. Assistive technologies represent a crucial challenge of scientific studies to overcome such an issue of reducing quality of life. Assistive devices such as wheelchairs, orthoses, and prostheses are designed and built to contribute rehabilitation progress and to regain lost functions. Although human body parts have intricate forms and functions, artificial devices and components integrating to the body are anticipated to compensate the fundamental functions related to user's demands. Upper- or lower-arm amputations also result in severe cosmetic matters. However, what is more important and obtrusive is the loss of primary functions including manipulating and grasping the objects besides the locomotor tasks which are performed by the human body during daily activity.

Shifting of the body center of gravity in low-risk preterm infants: A video-pedoscope study

2018 ◽  
Vol 124 ◽  
pp. 33-37 ◽  
Author(s):  
Natascia Bertoncelli ◽  
Laura Lucaccioni ◽  
Luca Ori ◽  
Christa Einspieler ◽  
Heinz F.R. Prechtl ◽  
...  
Keyword(s):  
Preterm Infants ◽  
Center Of Gravity ◽  
The Body ◽  
Low Risk ◽  
Body Center

Focal Ballismus (Right Arm) in a Boy with Wilson's Disease

2020 ◽  
Author(s):  
Roshan Koul ◽  
Priti Vijay ◽  
Rajeev Khanna ◽  
Seema Alam
Keyword(s):  
Basal Ganglia ◽  
Subthalamic Nucleus ◽  
Wilson’S Disease ◽  
Involuntary Movement ◽  
Wilson's Disease ◽  
Vascular Trauma ◽  
The Body ◽  
Lower Limbs ◽  
Rare Entity ◽  
The Right

AbstractBallismus is defined as rapid, forceful, shaking or throwing involuntary movement of the extremities, mainly proximal parts. When it affects half of the body (upper and lower limbs on one side), it is called hemiballismus. If it affects one limb, it could be labeled as focal or one limb ballismus. Any lesion (vascular, trauma, tumor, deposition, and demyelination) in the subthalamic nucleus of the basal ganglia results in ballismus. A rare entity such as copper deposition in Wilson's disease can manifest as ballismus. We describe a boy with Wilson's disease with focal ballismus of the right arm.

Properties of reach-related neuronal activity in cortical area 7A

1992 ◽  
Vol 67 (5) ◽  
pp. 1335-1345 ◽  
Author(s):  
W. A. MacKay
Keyword(s):  
The Body ◽  
Movement Direction ◽  
Video Monitor ◽  
Visual Responses ◽  
Motor Sequence ◽  
Related Activity ◽  
Significant Drop ◽  
Discharge Rates ◽  
Area 7A ◽  
The Right

1. In protocol 1, two macaque monkeys were trained to reach to illuminated buttons with the right arm as reach-related unit activity was monitored in area 7a of the left hemisphere. 2. Of 402 neurons recorded in area 7a, 109 changed their discharge rates during the reach task. The change could occur early or late in the trajectory, or during the return movement of the arm to the rest plate. Spatial preferences were seen in 59/109 reach-related cells, usually for the right or center buttons. 3. In protocol 2, another monkey was trained to reach with either arm to targets displayed on a touch-sensitive video monitor. Of 273 neurons sampled in area 7a (both hemispheres) during the bilateral task performance, 84 were reach-related: 33 responded similarly to reaches of either arm. Most of the rest had a contralateral arm preference. When bilateral reach-related cells had a spatial preference, that preference was the same for both arms. 4. With the use of two target sequences in either protocol, it was found that spatial preferences were observable only for primary reaches from the side of the body up to the target. Relatively few cells responded to other trajectories, and those that did usually failed to discriminate movement direction. Movement extent did not influence discharge rates. 5. Although a total of 125/270 reach cells had observable visual responses, only 4 out of 18 cells tested in both dark and light conditions showed a significant drop in reach-related activity in the dark. Thus visual input from the moving hand probably is responsible for only part of the reach activity in area 7a. 6. Reach-related activity in area 7a appears to signal specific phases of the motor performance and is often restricted to distinct spatial regions. As such, it could be used by the frontal lobe to facilitate upcoming elements of a motor sequence, including terminal corrections.

scholarly journals Copy Number Variation of the CADM2 Gene and Its Association with Growth Traits in Yak

Animals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1008 ◽  
Author(s):  
Fei Ge ◽  
Congjun Jia ◽  
Min Chu ◽  
Chunnian Liang ◽  
Ping Yan
Keyword(s):  
Body Weight ◽  
Copy Number Variation ◽  
Copy Number ◽  
Growth Traits ◽  
Quantitative Polymerase Chain Reaction ◽  
The Body ◽  
Gene Copy ◽  
Common Source ◽  
Economic Traits ◽  
Number Variation

Copy number variation (CNV) is currently accepted as a common source of genetic variation. It is reported that CNVs may influence the resistance to disease and complex economic traits, such as residual feed intake, muscle formation, and fat deposition in livestock. Cell adhesion molecule 2 (CADM2) is expressed widely in the brain and adipose tissue and can regulate body weight through the central nervous system. Growth traits are important economic traits for animal selection. In this study, we aimed to explore the effect of CADM2 gene copy number variants on yak growth traits. Here, two CNVs in the CADM2 gene were investigated using the quantitative polymerase chain reaction (qPCR), and the association of the CNVs with growth traits in yak was analyzed using statistical methods by SPSS software. Differences were considered significant if the p value was < 0.05. Statistical analysis indicated significant association of CADM2-CNV2 with the body weight of the Chinese Ashidan yak. A significant effect of CNV2 (p < 0.05) was found on body weight at 6 months. In CNV2, the gain-type copy number variation exhibited greater performance than the other variants, with greater body weight observed at 6 months (p < 0.05). To the best of our knowledge, this is the first attempt to investigate the function of CADM2-CNVs and their association with growth traits in animals. This may be a useful candidate marker in marker-assisted selection of yaks.

Inexperienced Sport Climbers Might Perceive and Utilize New Opportunities for Action by Merely Observing a Model

2002 ◽  
Vol 95 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Marc S. J. Boschker ◽  
Frank C. Bakker
Keyword(s):  
Center Of Gravity ◽  
The Body ◽  
Motor Action ◽  
Body Center ◽  
Climbing Wall ◽  
Video Model

The purpose of this study was to evaluate whether observing an expert climber would enable inexperienced climbers to perceive and accomplish new possibilities for action and whether this would facilitate their climbing performance. The focus was on what information is obtained during observation of a motor action. Three groups of inexperienced male participants ( N=24) observed either a video model of an expert method of climbing, a video model of a novice method of climbing, or the climbing wall on video without a model. Participants subsequently climbed the wall. This procedure of observation followed by climbing was repeated five times. Analysis showed participants perceived and subsequently utilized information from the videotapes and that this resulted in faster and more fluent climbing (as assessed by the geometric entropy of the body center of gravity). The results are discussed in terms of perceiving and accomplishing opportunities For action or affordances.

scholarly journals Incidence of dermatophytoses in a colony of mentally and physically handicapped people.

1984 ◽  
Vol 25 (4) ◽  
pp. 340-343
Author(s):  
Yuichi Sato ◽  
Shiro Koseki ◽  
Shinya Takahashi
Keyword(s):  
Handicapped People ◽  
Physically Handicapped

External work in walking

1963 ◽  
Vol 18 (1) ◽  
pp. 1-9 ◽  
Author(s):  
G. A. Cavagna ◽  
F. P. Saibene ◽  
R. Margaria
Keyword(s):  
Inertial Force ◽  
Center Of Gravity ◽  
The Body ◽  
External Work ◽  
High Speeds ◽  
Moving Body ◽  
Vertical Displacements ◽  
Lateral Displacements ◽  
Work Done ◽  
Static Contractions

From records obtained from a triple accelerometer applied to the trunk of a subject the displacements of the trunk in vertical, forward, and lateral directions have been calculated. With motion pictures taken simultaneously, displacements of the center of gravity within the body were measured. From these data the external mechanical work of walking was calculated. The sum of work for vertical and for forward displacements of the center of gravity of the body gives the total external work; energy for the lateral displacements was negligible. Total external work appears to be lower than that calculated from the vertical displacements alone, because work done in lifting is partly sustained by the inertial force of the forward-moving body. Total external work reaches a highest value (0.1 kcal/km kg) at the most economical speed of walking, 4 km/hr, which corresponds to an energy consumption of 0.48 kcal/km kg. At this speed the internal work appears negligible; it amounts to appreciable entities at very low speeds because of the static contractions of the muscles, and at high speeds because of considerable stiffening of the limbs and movements not involving a displacement of the center of gravity. Submitted on May 25, 1962

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