Evaluating body tracking interaction in floor projection displays with an elderly population

The recent development of affordable full body tracking sensors has made this technology accessible to millions of users and gives the opportunity to develop new natural user interfaces. In this paper we focused on developing 2 natural user interfaces that could easily be used by an elderly population for interaction with a floor projection display. One interface uses feet positions to control a cursor and feet distance to activate interaction. In the second interface, the cursor is controlled by ray casting the forearm into the projection and interaction is activated by hand pose. The interfaces were tested by 19 elderly participants in a point-and-click and a drag-and-drop task using a between-subjects experimental design. The usability and perceived workload for each interface was assessed as well as performance indicators. Results show a clear preference by the participants for the feet controlled interface and also marginal better performance for this method.info:eu-repo/semantics/publishedVersio

Characterizing the use of interactive technologies for cognitive rehabilitation in portuguese healthcare institutions

The increasing predominance of cognitive deficits following neurological conditions such as dementia and stroke is a major concern in Portugal. Cognitive rehabilitation has been shown to be fundamental to alleviate some of the deficits, but it is not always customized to the specific profile of each patient. More critically, patients typically do not have rehabilitation while they are in the waiting list or after discharge. One way to address these limitations is using interactive technologies specifically designed for cognitive rehabilitation. Their digital nature allows the customization of parameters enabling personalization and adaptation to each patient’s profile, as well as the possibility of quantification of performance. In addition, these tools have the potential to be used at home, allowing patients to continue their rehabilitation and being monitored remotely, alleviating the burden of institutionalization for both patients and healthcare systems. However, before proposing novel technologies, it is imperative to understand current practices, needs, preferences and expectations of health professionals in this domain. For this purpose, we developed an online questionnaire that was distributed among health professionals in Portugal. 116 participants have responded, with 35% reporting having experience in the use of interactive technologies for cognitive rehabilitation. Our results show that health professionals that use these technologies mainly value ease of interaction, diversity of activities, task personalization to the patient’s cognitive profile, and adaptation based on performance. These and other insights will be used to inform the development of novel tools for cognitive rehabilitation in clinical and home settings.info:eu-repo/semantics/publishedVersio

Neurorehabilitation using the virtual reality based Rehabilitation Gaming System: methodology, design, psychometrics, usability and validation

<p>Abstract</p> <p>Background</p> <p>Stroke is a frequent cause of adult disability that can lead to enduring impairments. However, given the life-long plasticity of the brain one could assume that recovery could be facilitated by the harnessing of mechanisms underlying neuronal reorganization. Currently it is not clear how this reorganization can be mobilized. Novel technology based neurorehabilitation techniques hold promise to address this issue. Here we describe a Virtual Reality (VR) based system, the Rehabilitation Gaming System (RGS) that is based on a number of hypotheses on the neuronal mechanisms underlying recovery, the structure of training and the role of individualization. We investigate the psychometrics of the RGS in stroke patients and healthy controls.</p> <p>Methods</p> <p>We describe the key components of the RGS and the psychometrics of one rehabilitation scenario called Spheroids. We performed trials with 21 acute/subacute stroke patients and 20 healthy controls to study the effect of the training parameters on task performance. This allowed us to develop a Personalized Training Module (PTM) for online adjustment of task difficulty. In addition, we studied task transfer between physical and virtual environments. Finally, we assessed the usability and acceptance of the RGS as a rehabilitation tool.</p> <p>Results</p> <p>We show that the PTM implemented in RGS allows us to effectively adjust the difficulty and the parameters of the task to the user by capturing specific features of the movements of the arms. The results reported here also show a consistent transfer of movement kinematics between physical and virtual tasks. Moreover, our usability assessment shows that the RGS is highly accepted by stroke patients as a rehabilitation tool.</p> <p>Conclusions</p> <p>We introduce a novel VR based paradigm for neurorehabilitation, RGS, which combines specific rehabilitative principles with a psychometric evaluation to provide a personalized and automated training. Our results show that the RGS effectively adjusts to the individual features of the user, allowing for an unsupervised deployment of individualized rehabilitation protocols.</p

Road crossing behaviors of pedestrians in two different virtual reality environments

About 20% of all people killed on roads are pedestrians. Virtual Reality (VR) simulators can be used to train street crossing and improve pedestrian safety, but the use of this technology has some limitations that need to be addressed. Common issues are related to the ecological validity of the experience because of poor immersion, movement limitations, and lack of visual and audio effects. In addition, these simulators are often very expensive. To address this, we developed a pedestrian street-crossing simulation that can be delivered through two mediums, a low-cost CAVE (Cave Automatic Virtual Environment) or a Head-Mounted Display (HMD). These two environments provide a high immersive experience, simple architecture, and a lower cost of deployment. Following an independent samples design, 20 participants were randomly allocated to the CAVE or HMD group and performed a street-crossing task. We measured the percentage of collisions with vehicles and presence through the Witmer and Singer Presence Questionnaire. Our results show that the percentage of collisions was significantly higher in the HMD group. Presence scores were high for both groups, but not significantly different. These results can be used to inform the design of VR simulators for safe street-crossing.info:eu-repo/semantics/publishedVersio

An integrative framework for tailoring virtual reality based motor rehabilitation after stroke

Stroke is a leading cause of life-lasting motor impairments, undermining the quality of life of stroke survivors and their families, and representing a major chal lenge for a world population that is ageing at a dramatic rate. Important technologi cal developments and neuroscientific discoveries have contributed to a better under standing of stroke recovery. Virtual Reality (VR) arises as a powerful tool because it allows merging contributions from engineering, human computer interaction, reha bilitation medicine and neuroscience to propose novel and more effective paradigms for motor rehabilitation. However, despite evidence of the benefits of these novel training paradigms, most of them still rely on the choice of particular technologi cal solutions tailored to specific subsets of patients. Here we present an integrative framework that utilizes concepts of human computer confluence to 1) enable VR neu rorehabilitation through interface technologies, making VR rehabilitation paradigms accessible to wide populations of patients, and 2) create VR training environments that allow the personalization of training to address the individual needs of stroke patients. The use of these features is demonstrated in pilot studies using VR training environments in different configurations: as an online low-cost version, with a myo electric robotic orthosis, and in a neurofeedback paradigm. Finally, we argue about the need of coupling VR approaches and neurocomputational modelling to further study stroke and its recovery process, aiding on the design of optimal rehabilitation programs tailored to the requirements of each user.info:eu-repo/semantics/publishedVersio

Desenvolvimento de instrumentos e metodologias para terapia e moritorização dos membros superiores

O presente trabalho tem como principal objectivo o desenvolvimento de instrumentos e metodologias para monitorização e terapia dos membros superiores, mais concretamente de cada dedo individualmente, de pessoas com disfunção motora a este nível. Neste livro são descritas as estratégias seguidas, e a sua fundament ação, e são discutidos os resultados preliminares obtidos com a implementação destas técnicas em ambiente hospitalar. ABSTRACT: This work has as main goal the development of instruments and methods for monitoring and therapy of the upper limbs, specifically of each finger independently, of people with motor dysfunction at this level. In this book, the followed strategies are described, as well as their motivation; We discuss preliminary results obtained with the implementation of these techniques in an hospital environment

Virtual reality with customized positive stimuli in a cognitive-motor rehabilitation task: a feasibility study with subacute stroke patients with mild cognitive impairment

Virtual Reality applications for integrated cognitive and motor stroke rehabilitation show promise for providing more comprehensive rehabilitation programs. However, we are still missing evidence on its impact in comparison with standard rehabilitation, particularly in patients with cognitive impairment. Additionally, little is known on how specific stimuli in the virtual environment affect task performance and its consequence on recovery. Here we investigate the impact in stroke recovery of a virtual cognitive-motor task customized with positive stimuli, in comparison to standard rehabilitation. The positive stimuli were images based on individual preferences, and self-selected music (half of the sessions). 13 participants in the subacute stage of stroke, with cognitive and motor deficits, were allocated to one of two groups (VR, Control). Motor and cognitive outcomes were assessed at end of treatment (4-6 weeks) and at a 4-week followup. Both groups showed significant improvements over time in functional ability during task performance, but without changes in motor impairment. Cognitive outcomes were modest in both groups. For participants in the VR group, the score in the task was significantly higher in sessions with music. There were no statistical differences between groups at end of treatment and follow-up. The impact of VR therapy was lower than in similar studies with stroke patients without cognitive deficits. This study is a first step towards understanding how VR could be shaped to address the particular needs of this population.info:eu-repo/semantics/publishedVersio

Coaching or gaming? Implications of strategy choice for home based stroke rehabilitation

Background: The enduring aging of the world population and prospective increase of age-related chronic diseases urge the implementation of new models for healthcare delivery. One strategy relies on ICT (Information and Communications Technology) home-based solutions allowing clients to pursue their treatments without institutionalization. Stroke survivors are a particular population that could strongly benefit from such solutions, but is not yet clear what the best approach is for bringing forth an adequate and sustainable usage of home-based rehabilitation systems. Here we explore two possible approaches: coaching and gaming. Methods: We performed trials with 20 healthy participants and 5 chronic stroke survivors to study and compare execution of an elbow flexion and extension task when performed within a coaching mode that provides encouragement or within a gaming mode. For each mode we analyzed compliance, arm movement kinematics and task scores. In addition, we assessed the usability and acceptance of the proposed modes through a customized self-report questionnaire. Results: In the healthy participants sample, 13/20 preferred the gaming mode and rated it as being significantly more fun (p < .05), but the feedback delivered by the coaching mode was subjectively perceived as being more useful (p < .01). In addition, the activity level (number of repetitions and total movement of the end effector) was significantly higher (p <.001) during coaching. However, the quality of movements was superior in gaming with a trend towards shorter movement duration (p=.074), significantly shorter travel distance (p <.001), higher movement efficiency (p <.001) and higher performance scores (p <.001). Stroke survivors also showed a trend towards higher activity levels in coaching, but with more movement quality during gaming. Finally, both training modes showed overall high acceptance. Conclusions: Gaming led to higher enjoyment and increased quality in movement execution in healthy participants. However, we observed that game mechanics strongly determined user behavior and limited activity levels. In contrast, coaching generated higher activity levels. Hence, the purpose of treatment and profile of end-users has to be considered when deciding on the most adequate approach for home based stroke rehabilitation

Impact of game mode in multi-user serious games for upper limb rehabilitation: a within-person randomized trial on engagement and social involvement

Background: Serious games have been increasingly used for motor rehabilitation. However, it is not well known how different game features can be used to impact specific skills properly. Here, we study how the mode (competitive, co-active, collaborative) in which a multi-user game is presented impacts engagement and social involvement. Methods: We collected data from 20 pairs of community-dwelling older adults (71.5 ± 8.7 years) in a study following a within-persons design. The participants performed a two-player upper limb rehabilitation game with three conditions (Competitive, Co-active, and Collaborative modes). Engagement and social involvement were assessed through the Core Module and Social Presence Module, respectively, from the Game Experience Questionnaire. To infer the impact of personality and cognitive function, users answered the International Personality Item Pool (short version) and the Montreal Cognitive Assessment, respectively. Results: Results show that the Collaborative game mode promotes more social involvement when compared to Competitive and Co-active modes. This result is mostly explained by those participants with higher cognitive skills, and those that are more extrovert. Extrovert participants feel more empathy and are behaviorally more involved when playing the Collaborative mode. Also, the Collaborative mode is shown to be appropriate to promote interaction with participants that previously had a distant relationship, while the Competitive mode seems to be more beneficial to promote empathy between players with a closer relationship. Conclusions: The Collaborative game mode elicited significantly higher social involvement in terms of Empathy, Positive Affect, and Behavioral Involvement. Hence, this game mode seems to be the most adequate choice to be used in multiplayer rehabilitation settings, where social interaction is intended.info:eu-repo/semantics/publishedVersio

The use of game modes to promote engagement and social involvement in multi-user serious games: a within-person randomized trial with stroke survivors

Serious games are promising for stroke rehabilitation, with studies showing a positive impact on reducing motor and cognitive defcits. However, most of the evidence is in the context of single-user rehabilitation, and little is known concerning the impact in multi-user settings. This study evaluates the impact that diferent game modes can have on engagement and social involvement during a two-user game. Specifcally, we want to under stand the benefts of game modalities based on competition, co-activation, and collaboration and analyze the infu ence of diferent motor and cognitive defcits and personality traits. Methods: We developed a two-player setup—using tangible objects and a large screen interactive table—for upper limb rehabilitation purposes. We implemented a game that, while keeping the same basic mechanics, can be played in the three diferent modes (Competitive, Co-active, and Collaborative). We ran a within-person randomized study with 21 stroke survivors that were paired and played the game in its three versions. We used the Game Experi ence Questionnaire—Core Module to assess engagement and the Social Presence Module to assess Social Involve ment. For personality, motor, and cognitive function, users answered the International Personality Item Pool (short version), Fugl-Meyer Assessment—Upper Extremity, Modifed Ashworth Scale, and Montreal Cognitive Assessment, respectively. Results: The Collaborative mode promoted signifcantly more Behavioral Involvement. The Competitive mode pro moted more Flow and Challenge than the Co-active mode with participants with better cognitive performance, with low extraversion, or with higher motor skills. Participants with higher cognitive defcits reported more Competence with the Co-active mode. Conclusions: Our results indicate that, for multi-user motor rehabilitation settings, the collaborative mode is the more appropriate gaming approach to promote social involvement, showing a high potential for increasing adher ence and efectiveness of therapy. Additionally, we show that a player’s motor and cognitive ability and personality should be considered when designing personalized tasks for multiplayer settings.info:eu-repo/semantics/publishedVersio