Search Results
Results 251 - 300 of 1470
< 1 2 3 4 5 6 7 8 9 10 11 >
How Yee-Fatt - - 2010
This study examined the effects of different life stages (first, second, third, fourth, and five instars; adult females and adult males) and feeding regimes (starved and blood fed) on the active movement activity of the tropical bed bug, Cimex hemipterus (F.), under mixed-stage conditions. We used an extended arena made ...
Avoaka Marie-Chantal - - 2010
The aim of this study was to evaluate the influence of the axial movement and the angle of curve (in degrees) on fatigue of nickel-titanium (Ni-Ti) ProFile rotary endodontic instruments. Ni-Ti ProFile rotary instruments (Maillefer SA, Ballaigues, Switzerland), 25 mm long in the range of ISO size 15 to 40 ...
Ichikawa Makoto - - 2010
In the present study, we investigated how observers' control of stimulus change affects temporal and spatial aspects of visual perception. We compared the illusory flash-lag effects for automatic movement of the stimulus with stimulus movement that was controlled by the observers' active manipulation of a computer mouse (Experiments 1, 2, ...
Krasovsky Tal - - 2010
BACKGROUND: Auditory cues are known to alter movement kinematics in healthy people as well as in people with neurological conditions (e.g., Parkinson's disease or stroke). Pacing movement to rhythmical constraints is known to change both the spatial and temporal features of movement. However, the effect of complexity of pacing on ...
Bronner S - - 2010
OBJECTIVES: To establish the reliability, accuracy and concurrent validity of electrogoniometers for measuring extreme lower extremity movements. STUDY DESIGN: Reliability, accuracy and validity study. Methods: This project employed two experiments. Investigation I determined electrogoniometer accuracy compared to a digital protractor. Investigation II compared electrogoniometers to a criterion measure, motion analysis, ...
Corr?a Umberto Cesar - - 2010
The adaptive process in motor learning was examined in terms of effects of varying amounts of constant practice performed before random practice. Participants pressed five response keys sequentially, the last one coincident with the lighting of a final visual stimulus provided by a complex coincident timing apparatus. Different visual stimulus ...
Meister Ingo G - - 2010
Whereas the cerebral representation of bimanual spatial coordination has been subject to prior research, the networks mediating bimanual temporal coordination are still unclear. The present study used functional imaging to investigate cerebral networks mediating temporally uncoupled bimanual finger movements. Three bimanual tasks were designed for the execution of movements with ...
Binetti Nicola - - 2010
The ability of effectively representing time ensures the efficiency and accuracy of sensory and motor processing. It is well documented that in still observers, subjective time varies in response to variations of external sensory inputs. However, it is still poorly understood how inertial inputs, which enable coding of body displacements ...
Stenekes M W - - 2010
Current treatment protocols for flexor tendon injuries of the hand generally result in an acceptable function, which can be quantified by objective parameters such as range of motion. The latter does not always match the patients' subjective experiences of persisting dysfunction. This raises the question whether changes in the cerebral ...
Matsuo Koichiro - - 2010
Tongue movement is temporo-spatially coordinated with jaw and hyoid movements during eating and speech. As such, we evaluated: (1) the correlation between the tongue with jaw and hyoid movements during eating and speech and (2) the relative influence of the jaw and hyoid on determining tongue movement. Lateral projection videofluorography ...
Kirsch Waldemar - - 2010
OBJECTIVE: This study examined the sensitivity of event-related cortical potentials (ERPs) preceding and accompanying goal-directed hand movements to the variation of movement distance. METHODS: Participants performed linear hand movements to memorized target locations, which were arranged in distances between 10 and 31cm from the starting position of the hand. EPRs ...
Korstanje Jan-Wiebe H - - 2010
PURPOSE: Cadaver and in vivo studies report variable results for tendon excursion during active and passive hand movements. The purpose of this study was to measure long finger flexor digitorum profundus (FDP) tendon excursion during active and passive movement using high-resolution ultrasound images. METHODS: The FDP tendon excursion was measured ...
Pillot M-H - - 2010
The environment of animals is often heterogeneous, containing zones that may be dedicated specifically to resting, drinking or feeding. These functional zones may spread over a more or a less extensive area. Thus, mobile animals may have to move from one patch to another when resources are locally depleted or ...
Hansen Steve - - 2010
The author examined the minimum amount of time needed for vision to increase aiming accuracy and decrease movement duration. Participants selected when they would receive a visual sample during aiming movements by pressing a switch held with the left hand. The sample was one of the following durations: 40 ms, ...
Bohan Michael - - 2010
Modern tools often separate the visual and physical aspects of operation, requiring users to manipulate an instrument while viewing the results indirectly on a display. This can pose usability challenges particularly in applications, such as laparoscopic surgery, that require a high degree of movement precision. Magnification used to augment the ...
Walsh Lee D - - 2010
The senses of limb movement and position are critical for accurate control of movement. Recent studies show that central signals of motor command contribute to the sense of limb position but it is not clear whether such signals influence the distinctly different sense of limb movement. Nine subjects participated in ...
Houweling Sanne - - 2010
Bimanual coordination requires the functional integration of the activity in various cortical, subcortical, spinal, and peripheral neural structures. We challenged this functional integration by destabilizing bimanual 5:8 tapping through an increase in movement tempo, while measuring brain and muscle activity using magnetoencephalography and electromyography. Movement instabilities were characterized by a ...
Casadio Maura M Department of Robotics, Brain and Cognitive Sciences, Italian Institute of Technology, Genoa, Italy. - - 2010
Skillful manipulation of objects often requires the spatio-temporal coordination of both hands and, at the same time, the compensation of environmental forces. In bimanual coordination, movements of the two hands may be coupled because each hand needs to compensate the forces generated by the other hand or by an object ...
Zusman Max - - 2010
The recognised (funded) stand-alone clinical status for therapeutic methods of passive movement has become increasingly threatened in recent times as the preference for active treatment (specific exercise) gains hold. This is in part due to the equivocal results for clinical trials of passive movement, queries regarding its cost-benefit and negative ...
Levy-Tzedek S S Massachusetts Institute of Technology, 77 Massachusetts, Ave office 3-137, Cambridge, MA 02139, - - 2010
We tested 23 healthy participants who performed rhythmic horizontal movements of the elbow. The required amplitude and frequency ranges of the movements were specified to the participants using a closed shape on a phase-plane display, showing angular velocity versus angular position, such that participants had to continuously control both the ...
Wang Joseph - - 2010
Synthetic nanoscale motors represent a major step in the development of practical nanomachines. This Review summarizes recent progress towards controlling the movement of fuel-driven nanomotors and discusses the challenges and opportunities associated with the achievement of such nanoscale motion control. Regulating the movement of artificial nanomotors often follows nature's elegant ...
Cressman Erin K - - 2010
Motor adaptation in response to a visuomotor distortion arises when the usual motor command no longer results in the predicted sensory output. In this study, we examined if exposure to a sensory discrepancy was sufficient on its own to produce changes in reaches and recalibrate the sense of felt hand ...
Gohau Gabriel - - 2010
Upon returning from his voyage on the Beagle, Darwin prepared reports of his geological observations. Together, these reveal Darwin's approach to reasoning about geology. Darwin argued that successive terraces prove a very gradual elevation of the coast that lagoon islands show a reciprocal sinking of the oceanic floor. Hence, Darwin ...
Tokiwa H - - 2010
The aim of this study was to determine anatomical locations of the hinge axis point, kinematic axis point and reference point for the palpated lateral condylar pole on lateral cephalograms. Subjects comprised 18 Japanese women selected according to following criteria: normal occlusion; and absence of signs and symptoms of stomatognathic ...
Kovacs Attila J AJ Department of Health and Kinesiology, Texas A&M University, College Station, TX 77843-4243, - - 2010
The purpose of the experiment was to determine the influence of Lissajous feedback on 1:1 bimanual coordination patterns (0 degrees , 90 degrees , and 180 degrees phase lags) when the movement amplitudes of the two limbs were different (30 degrees , 60 degrees ). The present data supports the ...
Liebermann Dario G - - 2010
Arm motion in healthy humans is characterized by smooth and relatively short paths. The current study focused on 3D reaching in stroke patients. Sixteen right-hemiparetic stroke patients and 8 healthy adults performed 42 reaching movements towards 3 visual targets located at an extended arm distance. Performance was assessed in terms ...
Yonetsu Ryo - - 2010
PURPOSE: The purpose of this study was to assess sit-to-stand (STS) movements of a child with cerebral palsy before and after physiotherapy (PT), based on objective kinematic data. METHODS: A child with cerebral spastic diplegia, aged 4 years and 6 months, and had no prior surgery, was the subject. In ...
Benvenuti Cinzia - - 2010
Agility is the player's capability to perform rapid whole-body movement with change of velocity or direction in response to a stimulus. The aims of this study were as follows: 1) to assess the reliability of a reactive visual stimuli agility field test (RVS-T); and 2) to evaluate differences in RVS-T ...
Torres Elizabeth B - - 2010
BACKGROUND: Movement regularities are inherently present in automated goal-directed motions of the primate's arm system. They can provide important signatures of intentional behaviours driven by sensory-motor strategies, but it remains unknown if during motor learning new regularities can be uncovered despite high variability in the temporal dynamics of the hand ...
Kwok Ka-Wai - - 2010
Flexible, ergonomically enhanced surgical robots have important applications to transluminal endoscopic surgery, for which path-following and dynamic shape conformance are essential. In this paper, kinematic control of a snake robot for motion stabilisation under dynamic active constraints is addressed. The main objective is to enable the robot to track the ...
Petersen Carl J - - 2010
We compared the movement patterns of cricketers in different playing positions across three formats of cricket (Twenty20, One Day, multi-day matches). Cricket Australia Centre of Excellence cricketers (n = 42) from five positions (batting, fast bowling, spin bowling, wicketkeeping, and fielding) had their movement patterns (walk, jog, run, stride, and ...
Shafir Tal - - 2010
Accurate timing of limb displacement is crucial for effective motor control. The authors examined the effects of movement velocity, duration, direction, added mass, and auditory cueing on timing, spatial, and trajectory variability of single- and multijoint rhythmic movements. During single-joint movements, increased velocity decreased timing and spatial variability, whereas increased ...
Sarlegna Fabrice R - - 2010
Most reaching arm movements have amplitude and direction constraints. Here we investigated the interdependence of these movement parameters in terms of visual control. To do so, we asked human adults to look and reach toward targets such that, in a first experiment, both movement amplitude and direction had to be ...
Maki Hiromichi - - 2010
We have developed a non-intrusive safety monitoring system which can measure respiration and body movements of solitary-living elderly people while they are in their home bathroom. These physiological variables are monitored with a 40 kHz ultrasonic transmitter and four receivers. The ultrasonic transmitter diffuses an ultrasonic wave throughout the room. ...
Harrison Neil R - - 2010
For moving targets, bimodal facilitation of reaction time has been observed for motion in the depth plane (C. Cappe, G. Thut, B. Romei, & M. M. Murray, 2009), but it is unclear whether analogous RT facilitation is observed for auditory-visual motion stimuli in the horizontal plane, as perception of horizontal ...
Li Renjie - - 2010
Action video game play enhances basic visual skills such as crowding acuity and contrast sensitivity (C. S. Green & D. Bavelier, 2007; R. Li, U. Polat, W. Makous, & D. Bavelier, 2009). Here, we ask whether the dynamics of perception may also be altered as a result of playing action ...
Sarlegna Fabrice R - - 2010
Most reaching arm movements have amplitude and direction constraints. Here we investigated the interdependence of these movement parameters in terms of visual control. To do so, we asked human adults to look and reach toward targets such that, in a first experiment, both movement amplitude and direction had to be ...
Troje Nikolaus F - - 2010
The silhouette illusion published online a number of years ago by the Japanese Flash designer Nobuyuki Kayahara has received substantial attention from the online community. One feature that seems to make it interesting is an apparent rotational bias: Observers see it spinning more often clockwise than counter-clockwise. Here, we show ...
Godfrey Sasha Blue - - 2010
After a stroke, many survivors have impaired motor function. Robotic rehabilitation techniques have emerged to provide a repetitive, activity-based therapy at potentially lower cost than conventional methods. Many patients exhibit intrinsic resistance to hand extension in the form of spasticity and/or hypertonia. We have developed a therapy program using the ...
Koopman Bart H F J M - - 2010
The part of (bio)mechanics that studies the interaction of forces on the human skeletal system and its effect on the resulting movement is called rigid body dynamics. Some basic concepts are presented: A mathematical formulation to describe human movement and how this relates on the mechanical loads acting on the ...
Watanabe Tatsuya - - 2010
Many people of all ages have sustained cervical cord injury in traffic accidents or sport accidents, and consequently suffered physical impairment. Among these individuals dysfunction of the upper limbs is a concern, although recovery from dysfunction is possible through rehabilitation. In this study, we developed an assistive robot for upper ...
Zawadzki Jerzy - - 2010
The present work deals with those properties of the human motor system that characterize cyclic movements of maximum (expected to be maximum) intensity. It presents the results of an experiment carried out on 11 subjects and aimed at measuring the kinematic characteristics of cyclic movements of the elbow joint executed ...
Cañal-Bruland Rouwen - - 2010
It is not clear whether the critical features used to discriminate movements are identical to those involved in predicting the same movement's effects and consequently, whether the mechanisms underlying recognition and anticipation differ. We examined whether people rely on different kinematic information when required to recognize differences in the movement ...
Imada Haruka - - 2010
In animal groups such as herds, schools, and flocks, a certain distance is maintained between adjacent individuals, allowing them to move as a cohesive unit. Proximate causations of the cohesive and coordinated movement under dynamic conditions, however, have been poorly understood. We established a novel and simple behavioral assay using ...
Iftime Nielsen Simona Denisia - - 2010
The focus of this study was to test a novel tool for the analysis of motor coordination with an altered visual input. The altered visual input was created using special glasses that presented the view as recorded by a video camera placed at various positions around the subject. The camera ...
de los Reyes-Guzmán Ana - - 2010
Three-dimensional kinematic analysis equipment is a valuable instrument for studying the execution of movement during functional activities of the upper limbs. The aim of this study was to analyze the kinematic differences in the execution of a daily activity such as drinking from a glass between two groups of patients ...
Grigos Maria I - - 2010
Jaw movement patterns were examined longitudinally in a 3-year-old male with childhood apraxia of speech (CAS) and compared with a typically developing control group. The child with CAS was followed for 8 months, until he began accurately and consistently producing the bilabial phonemes /p/, /b/, and /m/. A movement tracking ...
Bisio Ambra - - 2010
Automatic imitation is the tendency to reproduce observed actions involuntarily. Though this topic has been widely treated, at present little is known about the automatic imitation of the kinematic features of an observed movement. The present study was designed to understand if the kinematics of a previously seen stimulus primes ...
Dessing Joost C JC Center for Vision Research, York University, Toronto, Ontario, Canada. - - 2010
As bending free-kicks becomes the norm in modern day soccer, implications for goalkeepers have largely been ignored. Although it has been reported that poor sensitivity to visual acceleration makes it harder for expert goalkeepers to perceptually judge where the curved free-kicks will cross the goal line, it is unknown how ...
Blasi Anna A Biomedical Optics Research Laboratory, Department of Medical Physics and Bioengineering, University College London, Gower Street, London WC1E 6BT, UK. - - 2010
A key advantage of optical topography (OT) for cognitive neurodevelopmental studies over other imaging techniques such as magnetic resonance (MRI) or positron emission tomography (PET) is that it is less intrusive in the experimental set up. This is, in part, because in OT there is no need to impose strict ...
< 1 2 3 4 5 6 7 8 9 10 11 >