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Results 351 - 400 of 1344
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Loncharich Michael F - - 2011
The dynamics of postural finger tremor is typically investigated under conditions of natural vision of the finger. Here we investigated the effect of different types of augmented visual information feedback on finger tremor and on inter-limb tremor coordination. Four visual information conditions of postural finger tremor from either the dominant ...
Erickson R I Carl - - 2011
Proprioception is important in maintaining shoulder joint stability. Previous studies investigated the effects of unconstrained multiplanar motion, with subjects able to move freely in space, on repositioning tasks for active shoulder motion but not passive motion. We sought to further explore joint position sense with 3D passive, robot-guided motions. We ...
Bruder Gerd - - 2011
Motion perception in immersive virtual environments significantly differs from the real world. For example, previous work has shown that users tend to underestimate travel distances in virtual environments (VEs). As a solution to this problem, researchers proposed to scale the mapped virtual camera motion relative to the tracked real-world movement ...
Menon Geetha - - 2011
This phantom study quantifies changes in delivered dose due to respiratory motion for four breast radiotherapy planning techniques: three intensity-modulated techniques (forward-planned, surface-compensated and hybrid intensity-modulated radiation therapy (IMRT)); using a combination of open fields and inverse planned IMRT) and a 2D conventional technique. The plans were created on CT ...
Maus Horst-Moritz - - 2011
The motion of centre of mass (CoM) is a fundamental object of investigation in biomechanical analysis. In principle, the CoM motion can either be calculated from force data (dynamic method) or motion capture data (kinematic method). In both approaches, the accuracy of the calculated trajectories depends on the quality of ...
Francart Tom - - 2011
Users of a cochlear implant together with a contralateral hearing aid-so-called bimodal listeners-have difficulties with localizing sound sources. This is mainly due to the distortion of interaural time and level difference cues (ITD and ILD), and limited ITD sensitivity. An algorithm is presented that enhances ILD cues. Horizontal plane sound-source ...
Keshavarz Behrang - - 2011
Motion sickness (MS) is a well-known phenomenon in aviation and in virtual environments such as simulators or computer games. The severity of MS is thought to be due to the amount of sensory conflict, which should increase with the complexity of the simulated motion. The present study focused on the ...
Woo Jonghye - - 2011
The authors aimed to develop an image-based registration scheme to detect and correct patient motion in stress and rest cardiac positron emission tomography (PET)/CT images. The patient motion correction was of primary interest and the effects of patient motion with the use of flurpiridaz F 18 and (82)Rb were demonstrated. ...
Butcher Natalie - - 2011
In an experimental study, we assessed the role of motion when encoding and recognizing unfamiliar faces, using an old/new recognition memory paradigm. Our findings revealed a clear advantage for learning unfamiliar faces moving non-rigidly, compared with static faces. This advantage for motion was found with both same- and other-race faces. ...
Kwon Young W - - 2011
BACKGROUND: Reverse total shoulder arthroplasty (rTSA) has been used to treat patients with irreparable rotator cuff dysfunction. Despite the proven clinical efficacy, there is minimal information regarding the underlying changes to the shoulder kinematics associated with this construct. Therefore, we sought to examine the kinematics of dynamic shoulder motion in ...
Cheng Yu Shian - - 2011
Sunlight exposure is considered responsible for seasonal serotonin changes. Sixty-six healthy participants were recruited, and single photon emission computed tomography ([(123)I]-ADAM SPECT) was used to investigate the association between serotonin transporter (SERT) availability and duration of sunlight exposure in Taiwan, a subtropical country. No significant correlation between SERT availability and ...
Knopf Antje-Christin - - 2011
The most advanced delivery technique for proton radiotherapy is active spot scanning. So far, predominantly static targets have been treated with active spot scanning, since mobile targets in combination with dynamic treatment delivery can lead to interplay effects, causing inhomogeneous dose distributions. One way to mitigate motion effects is re-scanning. ...
Calabro Finnegan J - - 2011
Estimation of time-to-arrival for moving objects is critical to obstacle interception and avoidance, as well as to timing actions such as reaching and grasping moving objects. The source of motion information that conveys arrival time varies with the trajectory of the object raising the question of whether multiple context-dependent mechanisms ...
Sarafrazi Soodeh - - 2011
In sport setting, imagery is regarded as one of the most popular and effective techniques to enhance the learning strategies and performance of skills. However, its effect on correction of improper technique such as landing which causes injury is not clear. Therefore, the purpose of this study is to investigate ...
Harris Emma J EJ Joint Department of Physics, Institute of Cancer Research, Sutton, Surrey, UK. - - 2011
Three-dimensional (3D) soft tissue tracking using 3D ultrasound is of interest for monitoring organ motion during therapy. Previously we demonstrated feature tracking of respiration-induced liver motion in vivo using a 3D swept-volume ultrasound probe. The aim of this study was to investigate how object speed affects the accuracy of tracking ...
Berger Perrine - - 2011
We show how Up-converted Coherent Population Oscillations (UpCPO) enable to get rid of the intrinsic limitation of the carrier lifetime, leading to the generation of time delays at any high frequencies in a single SOA device. The linear dependence of the RF phase shift with respect to the RF frequency ...
Oesch Nicholas W - - 2011
Contrast is computed throughout the nervous system to encode changing inputs efficiently. The retina encodes luminance and contrast over a wide range of visual conditions and must adapt its responses to maintain sensitivity and to avoid saturation. We examined the means by which one type of adaptation allows individual synapses ...
Marks Michelle - - 2011
ABSTRACT: Study Design. A cross sectional study.Objective. The purpose of this study was to assess inter-vertebral segmental and cumulative motion in the distal un-fused segments of the spine in patients with Adolescent Idiopathic Scoliosis (AIS) following instrumentation as a function of the lowest instrumented level.Summary of Background Data. The implications ...
Ivanov Iliya V - - 2011
Shape processing involves a progression from a local to global analysis. A key aspect of this is the binding of distributed local features into an overall form followed by the extraction of the shape independently of its local contrast and spatial scales, so enabling the shape to be encoded based ...
Li Kun - - 2011
Three-dimensional motion estimation from multiview video sequences is of vital importance to achieve high-quality dynamic scene reconstruction. In this paper, we propose a new 3-D motion estimation method based on matrix completion. Taking a reconstructed 3-D mesh as the underlying scene representation, this method automatically estimates motions of 3-D objects. ...
Yuk Hyunwoo - - 2011
Inspired by its simple musculature, actuation and motion mechanisms, we have developed a small crawling robot that closely mimics the model organism of our choice: Caenorhabditis elegans. A thermal shape memory alloy (SMA) was selected as an actuator due to the similarities of its properties to C. elegans muscles. Based ...
Williams James C JC - - 2012
Struvite in kidney stones is an important marker for infection. In kidney stone samples, struvite is known to be prone to chemical breakdown, but no data exist on the stability of samples stored in dry form. The objective of this study was to examine stability of struvite under increasingly poor ...
Wang Jun - - 2011
Visual motion processing is compromised in schizophrenia (SZ), but it is uncertain what neural deviations account for their motion analysis abnormalities. Neural activations were measured with dense-array electroencephalography while 14 medicated SZ and 14 healthy persons performed a paired-stimuli forced choice speed discrimination task. SZ had (a) worse-at-speed discrimination, replicating ...
Bouak Fethi - - 2011
Tactile cueing has been explored primarily for the detection of linear motion such as vertical, longitudinal, and lateral translation in the laboratory and in flight. The usefulness of tactile cues in detecting roll and pitch motion has not been fully investigated. There were 12 subjects (21-56 yr) who were exposed ...
Giphart J Erik - - 2011
BACKGROUND: The in vivo stabilizing role of the long head of the biceps tendon (LHB) is poorly understood. While cadaveric studies report that the loaded LHB constrains translations in all directions, clinical data suggest that there is no clinically demonstrable alteration in glenohumeral position after LHB tenodesis or tenotomy. The ...
Borst Alexander - - 2011
Motion vision provides essential cues for navigation and course control as well as for mate, prey, or predator detection. Consequently, neurons responding to visual motion in a direction-selective way are found in almost all species that see. However, directional information is not explicitly encoded at the level of a single ...
Buresch Kendra C - - 2011
Cuttlefish, Sepia officinalis, commonly use their visually-guided, rapid adaptive camouflage for multiple tactics to avoid detection or recognition by predators. Two common tactics are background matching and resembling an object (masquerade) in the immediate area. This laboratory study investigated whether cuttlefish preferentially camouflage themselves to resemble a three-dimensional (3D) object ...
Hong Sang Wook SW Department of Psychology, Vanderbilt Vision Research Center, Vanderbilt University, 301 Wilson Hall, 111 21st Avenue South, Nashville, TN 37240, - - 2012
A sense of motion can be elicited by the movement of both luminance- and texture-defined patterns, what is commonly referred to as first- and second-order, respectively. Although there are differences in the perception of these two classes of motion stimuli, including differences in temporal and spatial sensitivity, it is debated ...
Davies T Claire - - 2011
Purpose: A prototype device was developed to allow individuals to hear ultrasound reflections off environmental obstacles. Previous studies have shown that this device allows for better distance judgement than audition and allows for effective passage through the centreline of apertures. The purpose of this research was to evaluate audification as ...
Vera-Garcia Francisco J - - 2011
The aim of this study was to compare trunk muscular recruitment and lumbar spine kinematics when motion was constrained to either the thorax or the pelvis. Nine healthy women performed four upright standing planar movements (rotations, anterior-posterior translations, medial-lateral translations, and horizontal circles) while constraining pelvis motion and moving the ...
Hadad Bat-Sheva - - 2011
We used a staircase procedure to test sensitivity to (1) global motion in random-dot kinematograms moving at 4° and 18° s(-1) and (2) biological motion. Thresholds were defined as (1) the minimum percentage of signal dots (i.e. the maximum percentage of noise dots) necessary for accurate discrimination of upward versus ...
Sunny Meera Mary - - 2011
Previous research on the attentional effects of moving objects has shown that motion per se does not capture attention. However, in later studies it was argued that the onset of motion does capture attention. Here, we show that this motion-onset effect critically depends on motion jerkiness-that is, the rate at ...
Tanifuji Osamu - - 2011
BACKGROUND: Analysis of the movement of anatomically defined reference axes at the femoral condyles relative to the tibia is appropriate for evaluating knee kinematics. However, such parameters have been previously employed only in studies utilizing stop-motion techniques. The purpose of this study was to evaluate in vivo dynamic kinematics for ...
Lee Joong - - 2011
This paper describes a method for verifying the authenticity of a seal impression imprinted on a document based on the seal overlay metric, which refers to the ratio of an effective seal impression pattern and the noise in the neighborhood of the reference impression region. A reference seal pattern is ...
Koshida S - - 2011
The aim of this study was to demonstrate the kinematics and kinetics of the lower extremity during the kendo strike-thrust motion in experienced kendo athletes. Fifteen experienced kendo athletes (age 20.4±1.2 years; height 171.5±4 cm; weight 73.9±9.1 kg; the kendo experience 11.1±3.1 years) volunteered to participate in the study. The ...
Hayward Jake - - 2011
We determined the effect of dot speed on the typical and atypical development of motion-defined form perception. Monocular motion coherence thresholds for orientation discrimination of motion-defined rectangles were determined at slow (0.1deg/s), medium (0.9deg/s) and fast (5.0deg/s) dot speeds. First we examined typical development from age 4 to 31years. We ...
Apker G A - - 2011
The roles of visual and somatosensory information in arm movement planning remain enigmatic. Previous studies have examined these roles by dissociating visual and somatosensory cues about limb position prior to movement onset and examining the resulting effects on movements performed in the horizontal plane. Here we examined the effects of ...
Sun Han - - 2011
Fibrosterol sulfate A is a polysulfated bis-steroid with an atypical side chain. Due to the flexibility of the linker, large-scale motions that change dramatically the shape of the entire molecule are expected. Such motions pose major challenges to the structure elucidation and the correct determination of configuration. In this study, ...
Rodger Matthew W M MW School of Psychology, Queen's University Belfast, David Keir Building, 18-30 Malone Road, Belfast BT9 5BN, UK. - - 2011
Understanding how the timing of motor output is coupled to sensory temporal information is largely based on synchronisation of movements through small motion gaps (finger taps) to mostly empty sensory intervals (discrete beats). This study investigated synchronisation of movements between target barriers over larger motion gaps when closing time gaps ...
Raudies Florian - - 2011
Motion transparency occurs when multiple coherent motions are perceived in one spatial location. Imagine, for instance, looking out of the window of a bus on a bright day, where the world outside the window is passing by and movements of passengers inside the bus are reflected in the window. The ...
Pavan Andrea A International School for Advanced Studies, SISSA, Cognitive Neuroscience Sector, Via Bonomea 265, 34136 Trieste, Italy. - - 2011
Blindsight patients can detect fast moving stimuli presented within their blind field even when they deny any phenomenal visual experience. Although mounting evidence suggests the presence of different mechanisms and separate neural substrates underlying the processing of first-order (luminance-defined) and second-order (contrast-defined) motion, the perception of second-order motion in blindsight ...
Veilleux Louis-Nicolas LN Département de Kinésiologie, Université de Montréal, C.P. 6128, Succursale Centre Ville, Montréal, QC H3C 3J7, Canada. - - 2011
Goal-directed movements performed in a virtual environment pose serious challenges to the central nervous system because the visual and proprioceptive representations of one's hand position are not perfectly congruent. The aim of the present study was to determine whether the vision of one's hand or upper arm, compared with that ...
Kratz Louis - - 2011
Tracking pedestrians is a vital component of many computer vision applications including surveillance, scene understanding, and behavior analysis. Videos of crowded scenes present significant challenges to tracking due to the large number of pedestrians and the frequent partial occlusions that they produce. The movement of each pedestrian, however, contributes to ...
Löken Line S - - 2011
The tactile sense comprises pathways for both discriminative and affective touch. Low threshold unmyelinated mechanoafferents (C tactile, CT) in the human hairy skin have recently been linked to pleasant touch sensation. Here, we investigated how perception of the hedonic aspect of tactile stimulation differs between the hairy skin of the ...
Adamson Justus - - 2011
We propose a method to quantify superior-inferior (SI) motion of a rigid target using the 3D contour from free-breathing CT (FBCT). The technique utilizes similarity between 2D contours (Jaccard Index) and a population based density function for probability of motion amplitude, and is applicable both when the static target shape ...
Morin Jean-Benoit - - 2011
We investigated the changes in the technical ability of force application/orientation against the ground vs. the physical capability of total force production after a multiple-set repeated sprints series. Twelve male physical education students familiar with sprint running performed four sets of five 6-s sprints (24s of passive rest between sprints, ...
Pilley M J - - 2011
This paper describes the use of a non-contact structured light scanning technique, computer aided design (CAD) and additive manufacturing (AM) to produce a burns pressure therapy splint, also known as mask or conformer. Masks such as this are used in the treatment of hypertrophic scars resulting from burns injuries. The ...
Combes Didier - - 2011
The productivity and stability of grazed grassland rely on dynamic interactions between the sward and the animal. The descriptions of the sward canopies by standard 2-D representations in studies of animal-sward interactions at the bite scale need to be improved to account for the effect of local canopy heterogeneity on ...
Macionis Valdas - - 2011
Clinicians frequently use finger goniometers to measure joint range of motion (ROM) in the digits. Other methods of depicting finger ROM can be beneficial in situations where therapists may not have access to finger goniometers, patients want to self-assess ROM, or therapists want to visually and graphically see composite ROM ...
Thompson James C - - 2011
Psychophysical and computational studies have provided evidence that both form and motion cues are used in the perception of biological motion. However, neuroimaging and neurophysiological studies have suggested that the neural processing of actions in temporal cortex might rely on form cues alone. Here we examined the contribution of form ...
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