scholarly journals The impact of visuospatial perception on distance judgment and depth perception in an Augmented Reality environment in patients after stroke: an exploratory study

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Chiara Höhler ◽  
Nils David Rasamoel ◽  
Nina Rohrbach ◽  
John Paulin Hansen ◽  
Klaus Jahn ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Task Performance ◽  
Depth Perception ◽  
Spatial Localization ◽  
Distance Judgment ◽  
Judgment Task ◽  
Regression Analyses ◽  
Visuospatial Perception ◽  
The Impact

Abstract Background Augmented Reality (AR)-based interventions are applied in neurorehabilitation with increasing frequency. Depth perception is required for the intended interaction within AR environments. Until now, however, it is unclear whether patients after stroke with impaired visuospatial perception (VSP) are able to perceive depth in the AR environment. Methods Different aspects of VSP (stereovision and spatial localization/visuoconstruction) were assessed in 20 patients after stroke (mean age: 64 ± 14 years) and 20 healthy subjects (HS, mean age: 28 ± 8 years) using clinical tests. The group of HS was recruited to assess the validity of the developed AR tasks in testing stereovision. To measure perception of holographic objects, three distance judgment tasks and one three-dimensionality task were designed. The effect of impaired stereovision on performance in each AR task was analyzed. AR task performance was modeled by aspects of VSP using separate regression analyses for HS and for patients. Results In HS, stereovision had a significant effect on the performance in all AR distance judgment tasks (p = 0.021, p = 0.002, p = 0.046) and in the three-dimensionality task (p = 0.003). Individual quality of stereovision significantly predicted the accuracy in each distance judgment task and was highly related to the ability to perceive holograms as three-dimensional (p = 0.001). In stroke-survivors, impaired stereovision had a specific deterioration effect on only one distance judgment task (p = 0.042), whereas the three-dimensionality task was unaffected (p = 0.317). Regression analyses confirmed a lacking impact of patients’ quality of stereovision on AR task performance, while spatial localization/visuoconstruction significantly prognosticated the accuracy in distance estimation of geometric objects in two AR tasks. Conclusion Impairments in VSP reduce the ability to estimate distance and to perceive three-dimensionality in an AR environment. While stereovision is key for task performance in HS, spatial localization/visuoconstruction is predominant in patients. Since impairments in VSP are present after stroke, these findings might be crucial when AR is applied for neurorehabilitative treatment. In order to maximize the therapy outcome, the design of AR games should be adapted to patients’ impaired VSP.  Trial registration: The trial was not registered, as it was an observational study.

scholarly journals The impact of visuospatial perception on distance judgment and depth perception in an Augmented Reality environment in patients after stroke: an exploratory study

2021 ◽  
Author(s):  
Chiara Höhler ◽  
Nils David Rasamoel ◽  
Nina Rohrbach ◽  
John Paulin Hansen ◽  
Klaus Jahn ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Task Performance ◽  
Depth Perception ◽  
Spatial Localization ◽  
Distance Judgment ◽  
Judgment Task ◽  
Regression Analyses ◽  
Visuospatial Perception ◽  
The Impact

Abstract Background Augmented Reality (AR)-based interventions are applied in neurorehabilitation with increasing frequency. Depth perception is required for the intended interaction within AR environments. Until now, however, it is unclear whether patients after stroke with impaired visuospatial perception (VSP) are able to perceive depth in the AR environment.Methods Different aspects of VSP (stereovision and spatial localization / visuoconstruction) were assessed in 20 patients after stroke (mean age: 64 ± 14 years) and 20 healthy subjects (HS, mean age: 28 ± 8 years) using clinical tests. The group of HS was recruited to assess the validity of the developed AR tasks in testing stereovision. To measure perception of holographic objects, three distance judgment tasks and one three-dimensionality task were designed. The effect of impaired stereovision on performance in each AR task was analyzed. AR task performance was modeled by aspects of VSP using separate regression analyses for HS and for patients.Results In HS, stereovision had a significant effect on the performance in all AR distance judgment tasks (p = .021, p = .002, p = .046) and in the three-dimensionality task (p = .003). Individual quality of stereovision significantly predicted the accuracy in each distance judgment task and was highly related to the ability to perceive holograms as three-dimensional (p = .001). In stroke-survivors, impaired stereovision had a specific deterioration effect on only one distance judgment task (p = .042), whereas the three-dimensionality task was unaffected (p = .317). Regression analyses confirmed a lacking impact of patients’ quality of stereovision on AR task performance, while spatial localization / visuoconstruction significantly prognosticated the accuracy in distance estimation of geometric objects in two AR tasks.Conclusion Impairments in VSP reduce the ability to estimate distance and to perceive three-dimensionality in an AR environment. While stereovision is key for task performance in HS, spatial localization / visuoconstruction is predominant in patients. Since impairments in VSP are present after stroke, these findings might be crucial when AR is applied for neurorehabilitative treatment. In order to maximize the therapy outcome, the design of AR games should be adapted to patients’ impaired VSP.Trial registration The trial was not registered, as it was an observational study.

scholarly journals Viewpoint Usability for Desktop Augmented Reality

2006 ◽  
Vol 5 (3) ◽  
pp. 33-39 ◽  
Author(s):  
Seokhee Jeon ◽  
Hyeongseop Shim ◽  
Gerard J. Kim
Keyword(s):  
Augmented Reality ◽  
Task Performance ◽  
Depth Perception ◽  
Object Manipulation ◽  
Head Mounted Display ◽  
Usability Problems ◽  
Head Mounted Displays ◽  
Hand Eye Coordination ◽  
Manipulation Task ◽  
Perceived Usability

In this paper, we have investigated the comparative usability among three different viewing configurations of augmented reality (AR) system that uses a desktop monitor instead of a head mounted display. In many cases, due to operational or cost reasons, the use of head mounted displays may not be viable. Such a configuration is bound to cause usability problems because of the mismatch in the user's proprioception, scale, hand eye coordination, and the reduced 3D depth perception. We asked a pool of subjects to carry out an object manipulation task in three different desktop AR set ups. We measured the subject's task performance and surveyed for the perceived usability and preference. Our results indicated that placing a fixed camera in the back of the user was the best option for convenience and attaching a camera on the user�s head for task performance. The results should provide a valuable guide for designing desktop augmented reality systems without head mounted displays

scholarly journals The application of virtual reality and augmented reality in Oral & Maxillofacial Surgery

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Ashraf Ayoub ◽  
Yeshwanth Pulijala
Keyword(s):  
Virtual Reality ◽  
Augmented Reality ◽  
Virtual Environment ◽  
Orthognathic Surgery ◽  
Maxillofacial Surgery ◽  
The Body ◽  
Historical Perspectives ◽  
Virtual And Augmented Reality ◽  
The Impact

Abstract Background Virtual reality is the science of creating a virtual environment for the assessment of various anatomical regions of the body for the diagnosis, planning and surgical training. Augmented reality is the superimposition of a 3D real environment specific to individual patient onto the surgical filed using semi-transparent glasses to augment the virtual scene.. The aim of this study is to provide an over view of the literature on the application of virtual and augmented reality in oral & maxillofacial surgery. Methods We reviewed the literature and the existing database using Ovid MEDLINE search, Cochran Library and PubMed. All the studies in the English literature in the last 10 years, from 2009 to 2019 were included. Results We identified 101 articles related the broad application of virtual reality in oral & maxillofacial surgery. These included the following: Eight systematic reviews, 4 expert reviews, 9 case reports, 5 retrospective surveys, 2 historical perspectives, 13 manuscripts on virtual education and training, 5 on haptic technology, 4 on augmented reality, 10 on image fusion, 41 articles on the prediction planning for orthognathic surgery and maxillofacial reconstruction. Dental implantology and orthognathic surgery are the most frequent applications of virtual reality and augmented reality. Virtual planning improved the accuracy of inserting dental implants using either a statistic guidance or dynamic navigation. In orthognathic surgery, prediction planning and intraoperative navigation are the main applications of virtual reality. Virtual reality has been utilised to improve the delivery of education and the quality of training in oral & maxillofacial surgery by creating a virtual environment of the surgical procedure. Haptic feedback provided an additional immersive reality to improve manual dexterity and improve clinical training. Conclusion Virtual and augmented reality have contributed to the planning of maxillofacial procedures and surgery training. Few articles highlighted the importance of this technology in improving the quality of patients’ care. There are limited prospective randomized studies comparing the impact of virtual reality with the standard methods in delivering oral surgery education.

scholarly journals Eye-Tracking as a Tool to Evaluate Functional Ability in Everyday Tasks in Glaucoma

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Enkelejda Kasneci ◽  
Alex A. Black ◽  
Joanne M. Wood
Keyword(s):  
Quality Of Life ◽  
Visual Search ◽  
Visual Field ◽  
Eye Tracking ◽  
Task Performance ◽  
Eye Movement ◽  
Search Behavior ◽  
The Impact ◽  
Analytical Approaches

To date, few studies have investigated the eye movement patterns of individuals with glaucoma while they undertake everyday tasks in real-world settings. While some of these studies have reported possible compensatory gaze patterns in those with glaucoma who demonstrated good task performance despite their visual field loss, little is known about the complex interaction between field loss and visual scanning strategies and the impact on task performance and, consequently, on quality of life. We review existing approaches that have quantified the effect of glaucomatous visual field defects on the ability to undertake everyday activities through the use of eye movement analysis. Furthermore, we discuss current developments in eye-tracking technology and the potential for combining eye-tracking with virtual reality and advanced analytical approaches. Recent technological developments suggest that systems based on eye-tracking have the potential to assist individuals with glaucomatous loss to maintain or even improve their performance on everyday tasks and hence enhance their long-term quality of life. We discuss novel approaches for studying the visual search behavior of individuals with glaucoma that have the potential to assist individuals with glaucoma, through the use of personalized programs that take into consideration the individual characteristics of their remaining visual field and visual search behavior.

PLANNING AND FOCUS ON FORM IN L2 ORAL PERFORMANCE

1999 ◽  
Vol 21 (1) ◽  
pp. 109-148 ◽  
Author(s):  
Lourdes Ortega
Keyword(s):  
Task Performance ◽  
Strategy Use ◽  
Oral Performance ◽  
Focus On Form ◽  
Planning Time ◽  
Attentional Processes ◽  
Interlanguage Development ◽  
Conscious Attention ◽  
The Impact

Previous research on the impact of pretask planning on interlanguage development (e.g., Crookes, 1989; Ellis, 1987; Foster & Skehan, 1996) has focused solely on the linguistic quality of planned output, leaving the cognitive and attentional processes engaged during planning time unexplored. Drawing on recent research on focus on form (Doughty & Williams, 1998a) and on retrospective methodologies used in strategy use research (e.g., O'Malley & Chamot, 1990), the study reported here investigated whether planning opportunity results in an increased focus on form at the level of strategic attention to form during planning time, as well as at the level of production outcomes during task performance. The results provide support for the claim that planning before doing an L2 task can promote an increased focus on form by providing space for the learner to devote conscious attention during pretask planning to formal and systemic aspects of the language needed to accomplish a particular task.

scholarly journals Impact of chronic kidney disease and anemia on health-related quality of life and work productivity: Analysis of multinational real-world data

2019 ◽  
Author(s):  
Heleen van Haalen ◽  
James Jackson ◽  
Bruce Spinowitz ◽  
Gary Milligan ◽  
Rebecca Moon
Keyword(s):  
Quality Of Life ◽  
Kidney Disease ◽  
Real World ◽  
Work Productivity ◽  
Regression Analyses ◽  
Activity Impairment ◽  
Ckd Stage ◽  
Related Quality ◽  
The Impact

Abstract Background. Reductions in health-related quality of life (HRQoL) in patients with chronic kidney disease (CKD) are thought to be exacerbated by the low hemoglobin (Hb) levels that define anemia, a common complication of CKD. The current analysis evaluated the impact of anemia on HRQoL and work productivity in patients with non-dialysis dependent and dialysis dependent CKD using real‑world data.Methods. Data were collected in France, Germany, Italy, Spain, the UK, the USA and China in 2012–2018 in the Adelphi Real World Disease Specific Programme™ (DSP) for CKD, a large, cross-sectional, survey of physicians and their patients. Patients completed three patient-reported outcomes (PRO) instruments: the EuroQol 5-Dimension 3-level (EQ-5D-3L), the Kidney Disease Quality of Life (KDQOL-36) instrument and the Work Productivity and Activity Impairment (WPAI) questionnaire. PROs were assessed by CKD stage and Hb levels, and regression analyses were performed with CKD stage and Hb level as independent variables and PROs as outcome variables, while adjusting for age, sex, CKD stage, comorbidities and CV risk.Results. Overall, 5276 patients participated in the survey, including 28% stage 4 and 36% dialysis patients. Patients with lower Hb levels more often reported problems/issues on all EQ-5D-3L domains (p<0.0001). Regression analyses showed significant associations between lower Hb levels and the probability of low (<0.8) EQ-5D-3L utility scores (p<0.0001) and low visual analog scale (VAS) scores (p<0.05), indicating poorer health status. Associations were seen even when adjusting for CKD stage and other potential confounding factors. Significant associations were observed between Hb level and the 12-Item Short-Form Health Survey (SF‑12) Physical Component Summary (PCS), SF-12 Mental Component Summary (MCS) and the three KDQOL-36 subscales (all p<0.0001), and were confirmed using linear regression analyses adjusting for CKD stage and other potential confounders. Numerically greater work productivity losses and greater activity impairment were observed with lower Hb levels.Conclusions. Lower Hb levels worsen the impact of CKD on HRQoL, and are associated with lower work productivity in patients with CKD. Assessment and treatment of anemia should be recognized as a key component of integral CKD management throughout all stages of the disease.

scholarly journals Impact of chronic kidney disease and anemia on health-related quality of life and work productivity: Analysis of multinational real-world data

2020 ◽  
Author(s):  
Heleen van Haalen ◽  
James Jackson ◽  
Bruce Spinowitz ◽  
Gary Milligan ◽  
Rebecca Moon
Keyword(s):  
Quality Of Life ◽  
Kidney Disease ◽  
Real World ◽  
Work Productivity ◽  
Regression Analyses ◽  
Real World Data ◽  
Activity Impairment ◽  
Ckd Stage ◽  
The Impact

Abstract Background Reductions in health-related quality of life (HRQoL) in patients with chronic kidney disease (CKD) are thought to be exacerbated by the low hemoglobin (Hb) levels that define anemia, a common complication of CKD. The current analysis evaluated the impact of anemia on HRQoL and work productivity in patients with non-dialysis dependent and dialysis-dependent CKD using real-world data. Methods Data were collected in France, Germany, Italy, Spain, the UK, the USA and China in 2012–2018 in the Adelphi Real World Disease Specific Programme™ for CKD, a large, cross-sectional, survey of physicians and their patients. Patients completed three patient-reported outcomes (PRO) instruments: the EuroQol 5-Dimension 3-level (EQ-5D-3L), the Kidney Disease Quality of Life (KDQOL-36) instrument and the Work Productivity and Activity Impairment questionnaire. PROs were assessed by CKD stage and Hb levels, and regression analyses were performed with CKD stage and Hb level as independent variables and PROs as outcome variables, while adjusting for age, sex, CKD stage, comorbidities and cardiovascular risk. Results Overall, 5276 patients participated in the survey, including 28% stage 4 and 36% dialysis patients. Patients with lower Hb levels more often reported problems/issues on all EQ-5D-3L domains (p<0.0001). Regression analyses showed significant associations between lower Hb levels and the probability of low (<0.8) EQ-5D-3L utility scores (p<0.0001) and low visual analog scale scores (p<0.05), indicating poorer health status. Associations were seen even when adjusting for CKD stage and other potential confounding factors. Significant associations were observed between Hb level and the 12-Item Short-Form Health Survey (SF-12) Physical Component Summary, SF-12 Mental Component Summary and the three KDQOL-36 subscales (all p<0.0001), and were confirmed using linear regression analyses adjusting for CKD stage and other potential confounders. Numerically greater work productivity losses and greater activity impairment were observed with lower Hb levels. Conclusions Lower Hb levels worsen the impact of CKD on HRQoL, and are associated with lower work productivity in patients with CKD. Assessment and treatment of anemia should be recognized as a key component of integral CKD management throughout all stages of the disease.

scholarly journals THE STUDY OF THE RESOLUTION TIME OF IDENTIFIERS OF DIGITAL OBJECTS OF UGMENTED REALITY BASED ON THE ARCHITECTURE OF DIGITAL OBJECTS

Telecom IT ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 21-33
Author(s):  
D. Reutova ◽  
R. Kirichek ◽  
A. Borodin
Keyword(s):  
Augmented Reality ◽  
Practical Relevance ◽  
Research Subject ◽  
Resolution Time ◽  
Network Delays ◽  
Augmented Reality Technology ◽  
Digital Objects ◽  
Effective Use ◽  
The Impact

Research subject. This article is devoted to studying the resolution time of the identifier of digital objects of augmented reality based on the architecture of digital objects, as well as studying the influence of this time on the quality of perception of digital objects by a person. Method. The architecture of digital objects is considered as a method of identifying digital objects of augmented reality, a simulation model of a fragment of a typical network of augmented reality technology based on the architecture of digital objects to study network delays is built. The main results. A table of identifier resolution time was received. Recommendations on the construction of augmented reality network are developed. Practical relevance. Assessing the impact of network latency arising from the identification of digital objects on the effective use of augmented reality.

scholarly journals Impact of chronic kidney disease and anemia on health-related quality of life and work productivity: Analysis of multinational real-world data

2020 ◽  
Author(s):  
Heleen van Haalen ◽  
James Jackson ◽  
Bruce Spinowitz ◽  
Gary Milligan ◽  
Rebecca Moon
Keyword(s):  
Quality Of Life ◽  
Kidney Disease ◽  
Real World ◽  
Work Productivity ◽  
Regression Analyses ◽  
Real World Data ◽  
Activity Impairment ◽  
Ckd Stage ◽  
The Impact

Abstract Background Reductions in health-related quality of life (HRQoL) in patients with chronic kidney disease (CKD) are thought to be exacerbated by the low hemoglobin (Hb) levels that define anemia, a common complication of CKD. The current analysis evaluated the impact of anemia on HRQoL and work productivity in patients with non-dialysis dependent and dialysis-dependent CKD using real-world data. Methods Data were collected in France, Germany, Italy, Spain, the UK, the USA and China in 2012–2018 in the Adelphi Real World Disease Specific Programme™ for CKD, a large, cross-sectional, survey of physicians and their patients. Patients completed three patient-reported outcomes (PRO) instruments: the EuroQol 5-Dimension 3-level (EQ-5D-3L), the Kidney Disease Quality of Life (KDQOL-36) instrument and the Work Productivity and Activity Impairment questionnaire. PROs were assessed by CKD stage and Hb levels, and regression analyses were performed with CKD stage and Hb level as independent variables and PROs as outcome variables, while adjusting for age, sex, CKD stage, comorbidities and cardiovascular risk. Results Overall, 5276 patients participated in the survey, including 28% stage 4 and 36% dialysis patients. Patients with lower Hb levels more often reported problems/issues on all EQ-5D-3L domains (p<0.0001). Regression analyses showed significant associations between lower Hb levels and the probability of low (<0.8) EQ-5D-3L utility scores (p<0.0001) and low visual analog scale scores (p<0.05), indicating poorer health status. Associations were seen even when adjusting for CKD stage and other potential confounding factors. Significant associations were observed between Hb level and the 12-Item Short-Form Health Survey (SF-12) Physical Component Summary, SF-12 Mental Component Summary and the three KDQOL-36 subscales (all p<0.0001), and were confirmed using linear regression analyses adjusting for CKD stage and other potential confounders. Numerically greater work productivity losses and greater activity impairment were observed with lower Hb levels. Conclusions Lower Hb levels worsen the impact of CKD on HRQoL, and are associated with lower work productivity in patients with CKD. Assessment and treatment of anemia should be recognized as a key component of integral CKD management throughout all stages of the disease.

The impact of task description linguistic style on task performance: a text mining of crowdsourcing contests

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Keng Yang ◽  
Hanying Qi ◽  
Qian Huang
Keyword(s):  
Text Mining ◽  
Task Performance ◽  
Cognitive Complexity ◽  
Content Type ◽  
Task Description ◽  
Task Descriptions ◽  
Language Styles ◽  
The Impact ◽  
And Task

PurposeExisting studies on the relationship between task description and task performance are insufficient, with many studies considering description length rather than content to measure quality or only evaluating a single aspect of task performance. To address this gap, this study analyzes the linguistic styles of task descriptions from 2,545 tasks on the Taskcn.com crowdsourcing platform.Design/methodology/approachAn empirical analysis was completed for task description language styles and task performance. The paper used text mining tool Simplified Chinese Linguistic Inquiry and Word Count to extract eight linguistic styles, namely readability, self-distancing, cognitive complexity, causality, tentative language, humanizing personal details, normative information and language intensity. And it tests the relationship between the eight language styles and task performance.FindingsThe study found that more cognitive complexity markers, tentative language, humanized details and normative information increase the quantity of submissions for a task. In addition, more humanized details and normative information in a task description improves the quality of task. Conversely, the inclusion of more causal relationships in a task description reduces the quantity of submissions. Poorer readability of the task description, less self-estrangement and higher language intensity reduces the quality of the task.Originality/valueThis study first reveals the importance of the linguistic styles used in task descriptions and provides a reference for how to attract more task solvers and achieve higher quality task performance by improving task descriptions. The research also enriches existing knowledge on the impact of linguistic styles and the applications of text mining.

Sign in / Sign up

Export Citation Format

Share Document