Optic flow in a virtual environment can impact on locomotor steering post stroke

2011 ◽  
Author(s):  
Jessica Berard ◽  
Joyce Fung ◽  
Anouk Lamontagne
Keyword(s):  
Virtual Environment ◽  
Optic Flow ◽  
Post Stroke

scholarly journals Transfer of Calibration in Virtual Reality to both Real and Virtual Environments

2019 ◽  
Vol 63 (1) ◽  
pp. 1943-1947 ◽  
Author(s):  
Hannah M. Solini ◽  
Ayush Bhargava ◽  
Christopher C. Pagano
Keyword(s):  
Virtual Reality ◽  
Virtual Environments ◽  
Virtual Environment ◽  
Real World ◽  
Optic Flow ◽  
Calibration Transfer ◽  
The Real ◽  
Before And After ◽  
Virtual Display ◽  
World Environment

It is often questioned whether task performance attained in a virtual environment can be transferred appropriately and accurately to the same task in the real world. With advancements in virtual reality (VR) technology, recent research has focused on individuals’ abilities to transfer calibration achieved in a virtual environment to a real-world environment. Little research, however, has shown whether transfer of calibration from a virtual environment to the real world is similar to transfer of calibration from a virtual environment to another virtual environment. As such, the present study investigated differences in calibration transfer to real-world and virtual environments. In either a real-world or virtual environment, participants completed blind walking estimates before and after experiencing perturbed virtual optic flow via a head-mounted virtual display (HMD). Results showed that individuals calibrated to perturbed virtual optic flow and that this calibration carried over to both real-world and virtual environments in a like manner.

Optic Flow in a Virtual Environment: Sustained Influence on Speed of Locomotion

2006 ◽  
Author(s):  
Wendy A. Powell ◽  
Steve Hand ◽  
Brett Stevens ◽  
Maureen Simmonds
Keyword(s):  
Virtual Environment ◽  
Optic Flow

Motor training in virtual environment for post-stroke and traumatic brain injured patients

2000 ◽  
Author(s):  
Lamberto Piron ◽  
Elena Trivello ◽  
Federica Cenni ◽  
Enzo Iaia ◽  
Mauro Dam ◽  
...  
Keyword(s):  
Virtual Environment ◽  
Motor Training ◽  
Post Stroke ◽  
Brain Injured ◽  
Traumatic Brain Injured ◽  
Injured Patients

scholarly journals Pengembangan Terapi Cermin Pada Latihan Bersepeda Berbasis Virtual Reality Untuk Meningkatkan Gerak Motorik Ekstremitas Atas Pasca Stroke

2018 ◽  
Vol 5 (4) ◽  
pp. 503 ◽  
Author(s):  
I Putu Dody Lesmana ◽  
Beni Widiawan ◽  
Didit Rahmat Hartadi ◽  
Muhammad Fuad Al Haris
Keyword(s):  
Virtual Reality ◽  
Virtual Environment ◽  
Upper Extremity ◽  
Strong Relationship ◽  
Mirror Therapy ◽  
Motor Cognition ◽  
Auditory Condition ◽  
Post Stroke ◽  
Motion Data ◽  
Visual Cueing

<p>Latihan bersepeda berbasis virtual reality (VR-Bicycling) bagi penderita pasca stroke merupakan teknologi yang dikembangkan untuk meningkatkan gerak motorik otot. Penerapan VR-Bicycling umumnya untuk melatih gerak motorik ekstremitas bawah daripada gerak motorik ekstremitas atas. Penggunaan terapi cermin (Mirror Therapy-MT) merupakan bentuk terapi gerak motorik ekstremitas atas dengan mempengaruhi propriosepsi otak yang berfikir bahwa eksterimitas atas yang mengalami hemiparesis dapat bergerak baik. Dalam penelitian ini dikembangan modul VR-Bicycling untuk melatih gerak motorik ekstremitas atas berbasis MT dengan mengkombinasikan umpan balik visual dan audio pada lingkungan virtual (Virtual Environment-VE). Umpan balik visual untuk mengetahui waktu tunda dan perbedaan spasial berupa ketepatan lengan virtual dalam menangkap apel atau menghindari bom sepanjang lintasan bersepeda. Sedangkan umpan balik audio menggunakan metronome untuk melatih operabilitas dan kontrol lengan virtual. Kinect digunakan sebagai motion capture gerakan lengan nyata. Pengujian melibatkan sepuluh penderita pasca stroke untuk melatih gerak motorik ekstremitas atas yang mengalami hemiparesis dalam mengontrol gerakan lengan virtual pada VR-Bicycling. Evaluasi sistem dilakukan dengan meminta penderita pasca stroke menjawab daftar pertanyaan yang mengandung faktor operabilitas, konsentrasi, kontrol gerakan, waktu tunda, dan perbedaan spasial dari terapi ekstremitas atas pada VR-Bicycling menggunakan konsep terapi cermin. Dari hasil evaluasi diketahui bahwa waktu tunda dan perbedaan spasial pada terapi ekstremitas atas menggunakan VR-Bicycling dengan MT merupakan dua variabel penting untuk mengontrol arah dan ketepatan gerakan lengan virtual pada VE.</p><p> </p><p class="Judul2"><strong><em>Abstract</em></strong></p><p class="Abstract"><em>A virtual reality bicycling (VR-Bicycling) was encouraged to address motor control and fitness deficits of person post-stroke. The applied of VR-Bicycling for therapy of person post-stroke has focused primarily on improving movement and use of the lower extremity than upper extremity. Mirror therapy (MT) is an instrument that enables a person with an amputation to view a reflection of an intact limb in the visual plane of the missing limb by tricking the brain into believing the missing limb is actually moving. The use of virtual reality (VR) over MT is that VR allows more complete immersion into the illusion, whereas MT requires tight focus and concentration to truly see the illusion as real. In this research, we had developed a VR-Bicycling module based MT for training upper extremity of person post-stroke while doing simulated bicycling. Person post-stroke cycled with guidance of visual cueing (represented as apples and bombs) and auditory condition (provided by metronome) in the virtual environment (VE). We tested ten person post-stroke as they cycled on a stationary bicycle while moving their virtual limb to hit apples or avoid bombs in VE. A VR-Bicycling module measures the motion data of upper extremity by Kinect and evaluate immersion and motor cognition by using factor analysis with three factors consisting of controllability, concentration, sense of delay, and spatial difference. The evaluation result indicates that temporal delay and spatial fluctuation have strong relationship to control virtual limb movement correctly.</em></p>

scholarly journals Forward optic flow is prioritised in visual awareness independently of walking direction

2020 ◽  
Author(s):  
Paweł Motyka ◽  
Mert Akbal ◽  
Piotr Litwin
Keyword(s):  
Virtual Environment ◽  
Optic Flow ◽  
Visual Experience ◽  
Visual Awareness ◽  
Hand Movements ◽  
Perceptual Awareness ◽  
Forward Locomotion ◽  
Self Motion ◽  
Smooth Transitions ◽  
Source Of Information

When two different images are presented separately to each eye, one experiences smooth transitions between them. Previous studies have shown that exposure to signals from other senses can enhance perceptual awareness of stimulation-congruent images. Surprisingly, despite our ability to infer perceptual consequences from bodily movements, evidence that action can have an analogous influence on visual experience is scarce and mainly limited to local (hand) movements. Here, we investigated whether one’s direction of locomotion affects perceptual awareness of optic flow patterns. Participants walked forwards and backwards on a treadmill while viewing highly-realistic visualisations of self-motion in a virtual environment. We hypothesised that visualisations congruent with walking direction would predominate in visual awareness over incongruent ones, and that this effect would increase with the precision of one’s active proprioception. These predictions were not confirmed: optic flow consistent with forward locomotion was prioritised in visual awareness independently of walking direction and proprioceptive abilities. Our results suggest that kinaesthetic-proprioceptive processing plays a limited role in shaping visual experience. This seems at odds with Bayesian accounts of perception but is in-line with Cancellation theories, which imply that crossmodal influences of self-generated signals are suppressed as a redundant source of information about the outside world.

Stationary walking performance of post-stroke patients and healthy individuals in real and virtual non-immersive environments

2021 ◽  
pp. 1-7
Author(s):  
Ailton Barbosa da Silva Júnior ◽  
Beatriz Cristina Medeiros de Lucena ◽  
Edson Meneses Silva-Filho ◽  
Aline Braga Galvão Silveira Fernandes
Keyword(s):  
Range Of Motion ◽  
Virtual Environment ◽  
Lower Limb ◽  
Healthy Individuals ◽  
Stroke Patients ◽  
Immersive Environments ◽  
The Real ◽  
Post Stroke ◽  
Real Environment ◽  
Immersive Virtual Environment

BACKGROUND: Several therapies are being used for the rehabilitation of stroke patients, such as Virtual Reality (VR) which has emerged as an interactive intervention to motivate and rehabilitate post-stroke patients. However, data comparison between the virtual and real environments is inconclusive. Thus, this study aimed to compare the kinematics and performance of the affected lower limb of post-stroke patients and healthy individuals during stationary walking activity between the real and virtual non-immersive environments. METHODS: A cross-sectional study was conducted with 10 stroke patients and 10 healthy individuals, matched for gender and age. The participants performed stationary walking in a real and non-immersive virtual environment (Wii Fit Plus® –Running mode) for 3 minutes in random order. The performance was measured in both environments using the number of steps, while the kinematics was assessed by calculating the mean maximum flexion and extension of each joint (hip, knee, and ankle) of the affected lower limb. RESULTS: Post-stroke patients performed a higher total number of steps (p = 0.042), mainly in the third minute (p = 0.011), less knee flexion (p = 0.001) and total knee range of motion (p = 0.001) in the virtual compared with the real environment. CONCLUSIONS: Post-stroke patients performed more steps, with a faster cadence and smaller knee range of motion on the affected side in non-immersive virtual environment compared with the real environment.

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