Evaluation of Control Interfaces for Active Trunk Support

Verros, Stergios; Mahmood, Nauzef; Peeters, Louis; Lobo-Prat, Joan; Bergsma, Arjen; Hekman, Edsko E.G.; Verkerke, Gijsbertus Jacob; Koopman, Bart

doi:10.1109/tnsre.2018.2866956

Cited by 10 publications

(23 citation statements)

References 19 publications

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“…Force trajectories for six different indices of difficulty (ID) were evaluated, where ID represents the amount of encoded information via Fitts' Law (Fitts, 1954;Fitts & Peterson, 1964;Schmidt & Lee, 2011). Successful analysis of force production in a Fitts' law paradigm has been demonstrated in a number of recent publications (Bertucco, Cesari, & Latash, 2013;Kim, Wininger, & Craelius, 2010;Thumser, Slifkin, Beckler, & Marasco, 2018;Verros et al, 2018). Movement time (MT) was computed as the time difference between consecutive force production maxima and minima in the time series.…”

Section: Methodsmentioning

confidence: 99%

The relationship between task difficulty and motor performance complexity

Gorniak

2018

Atten Percept Psychophys

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Difficult tasks are commonly equated with complex tasks across many behaviors. Motor task difficulty is traditionally defined via Fitts' law, using evaluation criteria based on spatial movement constraints. Complexity of data is typically evaluated using nonlinear computational approaches. In this project, we investigate the potential to evaluate task difficulty via behavioral (motor performance) complexity in a Fitts-type task. Use of non-linear approaches allows for inclusion of many features of motor actions that are not currently included in the Fitts-type paradigm. Our results indicate that tasks defined as more difficult (using Fitts movement IDs) are not associated with complex motor behaviors; rather, an inverse relationship exists between these two concepts. Use of non-linear techniques allowed for the detection of behavioral differences in motor performance over the entire action trajectory in the presence of action errors and among neutrally co-constrained effectors not detected using traditional Fitts'type analyses utilizing movement time measures. Our findings indicate that task difficulty may potentially be inferred using nonlinear measures, particularly in ecological situations that do not obey the Fitts-type testing paradigm. While we are optimistic regarding these initial findings, further work is needed to assess the full potential of the approach.

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Section: Methodsmentioning

confidence: 99%

The relationship between task difficulty and motor performance complexity

Gorniak

2018

Atten Percept Psychophys

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“…The opposing reasons, together with the progressive disease severity, cause the movement time of each control interface for each subject in the static experiment to be longer ( Fig. 1) than that of healthy participants found in the literature, except for the (E) performed by the third subject who achieved lower movement times than the healthy controls [11]. An explanation could be the exceptional immediate familiarization of the subject with the (E) control interface.…”

Section: Discussionmentioning

confidence: 82%

“…The first one was an active feasibility study. In this experiment we used the same protocol as in the experiment with healthy people [11]. While healthy people were able to control the active trunk support setup, the participants with DMD were unable to perform the same movements.…”

Section: Test Set-upmentioning

confidence: 99%

“…The experimental design was similar to the previous study [11]. A visual feedback was introduced to the subjects through a screen.…”

Section: Experimental Design Active and Static Experimentsmentioning

confidence: 99%

“…Also, force-based control and surface electromyography are promising control strategies for people with DMD [7,10]. Thus, we developed an active trunk support experimental setup to study and compare the performance differences of four different control interfaces of healthy males [11]. The control interfaces used were the joystick (J), force on sternum (FS), force on feet (FF) and surface electromyography (E).…”

Section: Introductionmentioning

confidence: 99%

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Exploring physiological signals on people with Duchenne muscular dystrophy for an active trunk support: a case study

et al. 2019

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Background: Arm support devices are available to support people with Duchenne muscular dystrophy (DMD), but active trunk support devices are lacking. An active trunk support device can potentially extend the reach of the arm and stabilize the unstable trunk of people with DMD. In a previous study, we showed that healthy people were able to control an active trunk support using four different control interfaces (based on joystick, force on feet, force on sternum and surface electromyography). All four control interfaces had different advantages and disadvantages. The aim of this study was to explore which of the four inputs is detectably used by people with DMD to control an active trunk support. Results: The results were subject-dependent in both experiments. In the active experiment, the joystick was the most promising control interface. Regarding the static experiment, surface electromyography and force on feet worked for two out of the three subjects. Conclusions: To our knowledge, this is the first time that people with DMD have engaged in a control task using signals other than those related to their arm muscles. According to our findings, the control interfaces have to be customised to every DMD subject.

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Head support in wheelchairs (scoping review): state-of-the-art and beyond

Geers

Prinsen

Pijl

et al. 2021

Disability and Rehabilitation: Assistive Technology

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Background: Many wheelchair users experience disabilities in stabilising and positioning of the head. For these users, adequate head support is required. Although several types of head supports are available, further development of these systems is needed to improve functionality and quality of life, especially for the group of severely challenged users. For this group, user needs have not been clearly established. In this article, we provide an overview of the state-of-the-art in wheelchair mounted head supports and associated scientific evidence in order to identify requirements for the next generation of head support systems. Materials and methods: A scoping review was performed including scientific literature (PubMed/ Scopus), patents (Espacenet/Google Scholar) and commercial information. Types of head support and important system characteristics for future head support systems were proposed from consultations with wheelchair users (n ¼ 3), occupational therapists (n ¼ 3) and an expert panel. Results: Forty scientific papers, 90 patents and 80 descriptions of commercial devices were included in the scoping review. The identified head support systems were categorised per head support type. Only limited scientific clinical evidence with respect to the effectiveness of existing head support systems was found. From the user and expert consultations, a need was identified for personalised head support systems that intuitively combine changes in sitting and head position with continuous optimal support of the head to accommodate severely challenged users. Conclusions: This study presents the state-of-the-art in head support systems. Additionally, several important system characteristics are introduced that provide guidance for the development and improvement of head supports. ä IMPLICATIONS FOR REHABILITATIONEspecially for the group of severely challenged wheelchair users, current head support systems require further development to improve their users' quality of life. The desired system characteristics which are discussed in this review are an important step in the definition of requirements for the next generation of head supports.

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Evaluation of Control Interfaces for Active Trunk Support

Cited by 10 publications

References 19 publications

The relationship between task difficulty and motor performance complexity

The relationship between task difficulty and motor performance complexity

Exploring physiological signals on people with Duchenne muscular dystrophy for an active trunk support: a case study

Head support in wheelchairs (scoping review): state-of-the-art and beyond

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