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To examine the evolution of inter-segmental coordination over-time, a previously developed multivariate model of postural coordination during quiet stance by Kuo et al. [1,2] has been extended. In the original model, postural coordination was treated as an eigenvalue–eigenvector problem between two segmental degrees of freedom represented by angular displacements of the trunk and shank. Strategies...
Hand impairment is common following stroke and is often resistant to traditional therapy methods. Successful interventions have stressed the importance of repeated practice to facilitate rehabilitation. Thus, we have developed a servo-controlled glove to assist extension of individual digits to promote practice of grasp-and-release movements with the hand. This glove, the PneuGlove, permits free movement...
Recent research has suggested that enhanced retraining for stroke patients using haptics (robotic forces) and graphics (visual display) to generate a practice environment that can artificially enhance error rather than reducing it, can stimulate new learning and foster accelerated recovery. We present an evaluation of early results of this novel post-stroke robotic-aided therapy trial that incorporates...
This paper presents the design and implementation of HAMERA (Hand cAMERA), a novel device for hand profile construction in the pervasive environment. With the help of software, HAMERA requires the minimum hardware of a mainstream mobile device enhanced with a single accelerometer, and is capable of providing advantageous features including high-quality hand image collection, on-device profile construction...
We present a coordinated ensemble of scalable computing techniques to accelerate a number of key tasks needed for vision-based gesture interaction, by using the cluster driving a large display system. A hybrid strategy that partitions the scanning task of a frame image by both region and scale is proposed. Based on this hybrid strategy, a novel data structure called a scanning tree is designed to...
Orientation of the body has been shown to adapt to sustained stance on a tilted support surface in subjects who were blindfolded or who had their eyes closed. Postural adaptation occurs even when the lower limbs are constrained, suggesting that there is central adaptation of the perception of vertical. These studies, however, were performed in the absence of visual inputs and it is not clear whether...
The purpose of this study was to determine how visual context affects intersegmental coordination during a postural stabilization task in older adults who are healthy or who have bilateral labyrinthine deficiency. Six healthy elderly (60-78 yrs) and 3 labyrinthine deficient (59-86 yrs) adults stood on a platform translating sinusoidally (plusmn10 cm at 0.25 Hz) in the a-p direction within an immersive,...
We have found, through a series of recent experiments, encouraging evidence that the neuro-motor system is motivated to change motor patterns when exposed to visuo-motor tasks. We have also shown that the learning of these tasks can be heightened with forces and/or visual distortions that appropriately manipulate the error. This process does not require intense concentration and it is often considered...
Impairment of hand function is prevalent among stroke survivors, motivating the search for effective rehabilitation therapy. Recent studies have suggested that for upper extremity functional recovery, repetitive training with virtual reality is helpful. Repetitive training can be facilitated with assistance from mechanical devices. Thus, we have developed a training environment that integrates augmented...
We have united an immersive dynamic virtual environment with motion of a posture platform to record biomechanical and physiological responses to combined visual, vestibular, and proprioceptive inputs. A 6 degree-of-freedom force plate provides measurements of moments exerted on the base of support. Kinematic data from the head, trunk, and lower limb is collected using 3-D video motion analysis. The...
Virtual environments (VE) have been shown to be a powerful tool for various forms of rehabilitation. Currently, VE has been used in psychological training, motor recovery, visual relearning, and pain reduction during physical therapy. VE's use is also being explored in stroke rehabilitation coupled to robots, posture control in labyrinthine deficit patients, tele-rehabilitation and in other areas...
With technological progress, wide field-of-view (FOV) displays will become increasingly common. Wide FOVs provide a more immersive environment and produce stronger self-motion perception. The objective of this study was to investigate the relationships between FOV and scene content on postural stability in an immersive environment. 10 subjects were tested using two different scenes (a simple radial...
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