scholarly journals Spatial Neglect Midline Diagnostics From Virtual Reality and Eye Tracking in a Free-Viewing Environment

2021 ◽  
Vol 12 ◽  
Author(s):  
Bastian I. Hougaard ◽  
Hendrik Knoche ◽  
Jim Jensen ◽  
Lars Evald
Keyword(s):  
Virtual Reality ◽  
Eye Tracking ◽  
Spatial Neglect ◽  
Fixation Time ◽  
Head Orientation ◽  
Group Level ◽  
Stroke Patients ◽  
Individual Level ◽  
Free Viewing ◽  
Level Analysis

Purpose: Virtual reality (VR) and eye tracking may provide detailed insights into spatial cognition. We hypothesized that virtual reality and eye tracking may be used to assess sub-types of spatial neglect in stroke patients not readily available from conventional assessments.Method: Eighteen stroke patients with spatial neglect and 16 age and gender matched healthy subjects wearing VR headsets were asked to look around freely in a symmetric 3D museum scene with three pictures. Asymmetry of performance was analyzed to reveal group-level differences and possible neglect sub-types on an individual level.Results: Four out of six VR and eye tracking measures revealed significant differences between patients and controls in this free-viewing task. Gaze-asymmetry between-pictures (including fixation time and count) and head orientation were most sensitive to spatial neglect behavior on a group level analysis. Gaze-asymmetry and head orientation each identified 10 out of 18 (56%), compared to 12 out of 18 (67%) for the best conventional test. Two neglect patients without deviant performance on conventional measures were captured by the VR and eyetracking measures. On the individual level, five stroke patients revealed deviant gaze-asymmetry within-pictures and six patients revealed deviant eye orientation in either direction that were not captured by the group-level analysis.Conclusion: This study is a first step in using VR in combination with eye tracking measures as individual differential neglect subtype diagnostics. This may pave the way for more sensitive and elaborate sub-type diagnostics of spatial neglect that may respond differently to various treatment approaches.

scholarly journals Nonergodicity in Load and Recovery: Group Results Do Not Generalize to Individuals

2021 ◽  
pp. 1-9
Author(s):  
Niklas D. Neumann ◽  
Nico W. Van Yperen ◽  
Jur J. Brauers ◽  
Wouter Frencken ◽  
Michel S. Brink ◽  
...  
Keyword(s):  
Perceived Exertion ◽  
Rating Of Perceived Exertion ◽  
Group Level ◽  
Total Quality ◽  
Individual Level ◽  
Quality Of Recovery ◽  
Level Statistics ◽  
The Individual ◽  
Level Analysis

Purpose: The study of load and recovery gained significant interest in the last decades, given its important value in decreasing the likelihood of injuries and improving performance. So far, findings are typically reported on the group level, whereas practitioners are most often interested in applications at the individual level. Hence, the aim of the present research is to examine to what extent group-level statistics can be generalized to individual athletes, which is referred to as the “ergodicity issue.” Nonergodicity may have serious consequences for the way we should analyze, and work with, load and recovery measures in the sports field. Methods: The authors collected load, that is, rating of perceived exertion × training duration, and total quality of recovery data among youth male players of a professional football club. This data were collected daily across 2 seasons and analyzed on both the group and the individual level. Results: Group- and individual-level analysis resulted in different statistical outcomes, particularly with regard to load. Specifically, SDs within individuals were up to 7.63 times larger than SDs between individuals. In addition, at either level, the authors observed different correlations between load and recovery. Conclusions: The results suggest that the process of load and recovery in athletes is nonergodic, which has important implications for the sports field. Recommendations for training programs of individual athletes may be suboptimal, or even erroneous, when guided by group-level outcomes. The utilization of individual-level analysis is key to ensure the optimal balance of individual load and recovery.

scholarly journals The Effect of Virtual Reality Training on Unilateral Spatial Neglect in Stroke Patients

2011 ◽  
Vol 35 (3) ◽  
pp. 309 ◽  
Author(s):  
Yong Mi Kim ◽  
Min Ho Chun ◽  
Gi Jeong Yun ◽  
Young Jin Song ◽  
Han Eun Young
Keyword(s):  
Virtual Reality ◽  
Spatial Neglect ◽  
Virtual Reality Training ◽  
Stroke Patients ◽  
Unilateral Spatial Neglect

scholarly journals Into the unknown: head-based selection is less dependent on peripheral information than gaze-based selection in 360-degree virtual reality scenes

2020 ◽  
Author(s):  
Oliver Jacobs ◽  
Nicola C Anderson ◽  
Walter F. Bischof ◽  
Alan Kingstone
Keyword(s):  
Virtual Reality ◽  
Eye Tracking ◽  
Real World ◽  
Ecological Validity ◽  
Attentional Selection ◽  
Moving Window ◽  
Free Viewing ◽  
Gaze Behaviour ◽  
Future Potential ◽  
Study Participants

People naturally move both their head and eyes to attend to information. Yet, little is known about how the head and eyes coordinate in attentional selection due to the relative sparsity of past work that has simultaneously measured head and gaze behaviour. In the present study, participants were asked to view fully immersive 360-degree scenes using a virtual reality headset with built-in eye tracking. Participants viewed these scenes through a small moving window that was yoked either to their head or gaze movements. We found that limiting peripheral information via the head- or gaze-contingent windows affected head and gaze movements differently. Compared with free viewing, gaze-contingent viewing was more disruptive than head-contingent viewing, indicating that gaze-based selection is more reliant on peripheral information than head-based selection. These data dovetail with the nested effectors hypothesis, which proposes that people prefer to use their head for exploration into non-visible space while using their eyes to exploit visible or semi-visible areas of space. This suggests that real-world orienting may be more head-based than previously thought. Our work also highlights the utility, ecological validity, and future potential of unconstrained head and eye tracking in virtual reality.

Collective norms of engagement link to individual engagement

2015 ◽  
Vol 30 (7) ◽  
pp. 847-860
Author(s):  
Barbara Griffin
Keyword(s):  
Survey Data ◽  
Normative Data ◽  
Design Methodology ◽  
Group Level ◽  
Content Type ◽  
Individual Level ◽  
Senior Leader ◽  
Manager Support ◽  
Multi Level ◽  
Level Analysis

Purpose – The purpose of this paper is to apply a group norm approach to explain how average engagement across an organization is related to an individual’s level of engagement. Design/methodology/approach – Survey data were collected from over 46,000 participants from 140 organizations. Multi-level analysis tested the hypotheses that similarity (in terms of shared status) and likely interaction would determine the extent a group’s norms affected individual engagement. Normative data and the dependent variable data were provided by different participants. Findings – Results supported the aggregation of individuals’ measure of engagement to form three norms within an organization: an employee norm, a manager norm and a senior leader norm. These engagement norms were significantly related to an individual’s engagement at work beyond the effect of both organizational resources and manager support. Individuals were more strongly influenced by the norm of those in the organization with whom they were most similar and with whom they were likely to interact. Originality/value – Provides evidence that engagement exists at the group level and that status groups within the organization have norms that independently affect individual-level engagement.

The relationship of transformational leadership with group cohesiveness and emotional intelligence

2009 ◽  
Vol 37 (3) ◽  
pp. 379-392 ◽  
Author(s):  
Yung-Shui Wang ◽  
Tung-Chun Huang
Keyword(s):  
Emotional Intelligence ◽  
Transformational Leadership ◽  
Theory And Practice ◽  
Study Group ◽  
Group Level ◽  
Group Cohesiveness ◽  
Individual Level ◽  
Relationship Of ◽  
The Relationship ◽  
Level Analysis

Previous work on transformational leadership has focused predominantly on individual level analysis, while less attention has been paid to investigating why leaders engage in transformational leadership. In this study, group level outcomes pertaining to cohesiveness as well as the antecedent factor of emotional intelligence as it relates to transformational leadership are investigated. Data were collected from 51 department managers and 252 employees in 23 small-medium textile business firms in Taiwan. Results indicate that both emotional intelligence and group cohesiveness are positively associated with transformational leadership. In addition, transformational leadership mediates the relationship between leaders' emotional intelligence and group cohesiveness. Implications of the findings in terms of theory and practice are discussed.

Translation Research for the Rehabilitation of Left Spatial Neglect and Associated Disorders of Attention in Stroke Patients

2008 ◽  
Vol 18 (2) ◽  
pp. 55-65 ◽  
Author(s):  
Nkiruka Arene ◽  
Argye E. Hillis
Keyword(s):  
Theoretical Basis ◽  
Attention Bias ◽  
Spatial Neglect ◽  
Clinical Use ◽  
Stroke Patients ◽  
Translation Research ◽  
Unilateral Neglect ◽  
Assessment And Treatment ◽  
Sound Theoretical Basis ◽  
Review Current

Abstract The syndrome of unilateral neglect, typified by a lateralized attention bias and neglect of contralateral space, is an important cause of morbidity and disability after a stroke. In this review, we discuss the challenges that face researchers attempting to elucidate the mechanisms and effectiveness of rehabilitation treatments. The neglect syndrome is a heterogeneous disorder, and it is not clear which of its symptoms cause ongoing disability. We review current methods of neglect assessment and propose logical approaches to selecting treatments, while acknowledging that further study is still needed before some of these approaches can be translated into routine clinical use. We conclude with systems-level suggestions for hypothesis development that would hopefully form a sound theoretical basis for future approaches to the assessment and treatment of neglect.

Eye movements in sports research and practice: Immersive technologies as optimal environments for the study of gaze behaviour

2020 ◽  
Author(s):  
David Harris ◽  
Mark Wilson ◽  
Tim Holmes ◽  
Toby de Burgh ◽  
Samuel James Vine
Keyword(s):  
Virtual Reality ◽  
Eye Movements ◽  
Eye Tracking ◽  
Visual Information ◽  
Successful Performance ◽  
Experimental Control ◽  
Research And Practice ◽  
Gaze Behaviour ◽  
Immersive Technologies

Head-mounted eye tracking has been fundamental for developing an understanding of sporting expertise, as the way in which performers sample visual information from the environment is a major determinant of successful performance. There is, however, a long running tension between the desire to study realistic, in-situ gaze behaviour and the difficulties of acquiring accurate ocular measurements in dynamic and fast-moving sporting tasks. Here, we describe how immersive technologies, such as virtual reality, offer an increasingly compelling approach for conducting eye movement research in sport. The possibility of studying gaze behaviour in representative and realistic environments, but with high levels of experimental control, could enable significant strides forward for eye tracking in sport and improve understanding of how eye movements underpin sporting skills. By providing a rationale for virtual reality as an optimal environment for eye tracking research, as well as outlining practical considerations related to hardware, software and data analysis, we hope to guide researchers and practitioners in the use of this approach.

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