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Levi J. Hargrove
Northwestern University
178Publications
33H-index
4,322Citations
Publications 171
Newest
#1Joseph V. Kopke (NU: Northwestern University)H-Index: 1
#2Levi J. Hargrove (NU: Northwestern University)H-Index: 33
Last.Michael D. Ellis (NU: Northwestern University)H-Index: 14
view all 3 authors...
Background Abnormal synergy is a major stroke-related movement impairment that presents as an unintentional contraction of muscles throughout a limb. The flexion synergy, consisting of involuntary flexion coupling of the paretic elbow, wrist, and fingers, is caused by and proportional to the amount of shoulder abduction effort and limits reaching function. A wearable exoskeleton capable of predicting movement intent could augment abduction effort and therefore reduce the negative effects of dist...
1 CitationsSource
#1Richard B. Woodward (NU: Northwestern University)H-Index: 3
#2Levi J. Hargrove (NU: Northwestern University)H-Index: 33
Background Pattern recognition technology allows for more intuitive control of myoelectric prostheses. However, the need to collect electromyographic data to initially train the pattern recognition system, and to re-train it during prosthesis use, adds complexity that can make using such a system difficult. Although experienced clinicians may be able to guide users to ensure successful data collection methods, they may not always be available when a user needs to (re)train their device.
2 CitationsSource
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#1Mariah W. Whitmore (NU: Northwestern University)H-Index: 2
#2Levi J. HargroveH-Index: 33
Last.Eric J. PerreaultH-Index: 31
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Objective: This study investigated the consequences of reduced ankle muscle activity on slippery surfaces. We hypothesized that reduced activation would reduce shear forces and ankle impedance to improve contact and reduce slip potential. Methods: Data were collected from unimpaired adults walking across non-slippery and slippery walkways. Set within the walkway was a robotic platform with an embedded force plate for collecting shear forces and estimating the mechanical impedance of the ankle; i...
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Jul 1, 2019 in EMBC (International Conference of the IEEE Engineering in Medicine and Biology Society)
#1Eric J. Earley (NU: Northwestern University)H-Index: 2
#2Levi J. HargroveH-Index: 33
Motor adaptation studies can provide insight into how the brain handles ascending and descending neural signals during motor tasks, revealing how neural pathologies affect the capacity to learn and adapt to movement errors. Such studies often involve reaches towards prompted target locations, with adaptation and learning quantified according to Euclidean distance between reach endpoint and target location. This paper describes methods to calculate steady-state error using knowledge of the distri...
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#1Ann M. SimonH-Index: 17
#2Kristi TurnerH-Index: 3
Last.Todd A. KuikenH-Index: 43
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Although more multi-articulating hand prostheses have become commercially available, replacing a missing hand remains challenging from a control perspective. This study investigated myoelectric direct control and pattern recognition home use of a multi-articulating hand prosthesis for individuals with a transradial amputation. Four participants were fitted with an i-limb Ultra Revolution hand and a Coapt COMPLETE CONTROL system. An occupational therapist provided training for each control style ...
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#1Limei Tian (A&M: Texas A&M University)H-Index: 24
#2Benjamin Zimmerman (UIUC: University of Illinois at Urbana–Champaign)H-Index: 7
Last.John A. RogersH-Index: 135
view all 29 authors...
1 CitationsSource
#1Tommaso Lenzi (UofU: University of Utah)H-Index: 23
#2Marco CempiniH-Index: 11
Last.Todd A. Kuiken (NU: Northwestern University)H-Index: 43
view all 4 authors...
Robotic ankle prostheses can imitate the biomechanical function of intact legs at the cost of a larger weight and size compared to conventional passive prostheses. Unfortunately, increased weight and size negatively affect comfort and socket stability, ultimately limiting their clinical viability. Alternatively, a nonbackdrivable transmission system can be used to actively regulate the ankle position during nonweight bearing activities only. This semiactive design can be made smaller and lighter...
3 CitationsSource
#1Limei Tian (A&M: Texas A&M University)H-Index: 24
#2Benjamin Zimmerman (UIUC: University of Illinois at Urbana–Champaign)H-Index: 7
Last.John A. Rogers (NU: Northwestern University)H-Index: 135
view all 29 authors...
In Fig. 4c of this Article originally published, the bottom y axis was incorrectly labelled as ‘MRI–ECG (μV)’; the correct label is ‘MRI/ECG’. In addition, in Fig. 4d, the bottom y axis was incorrectly labelled as ‘ECG (μV)’; the correct label is ‘ECG (mV)’. The scale bar units were also incorrectly stated as ‘mV’, the correct units are ‘μV’. The figure has now been amended accordingly.
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#1Iason Batzianoulis (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 3
#2Ann M. Simon (NU: Northwestern University)H-Index: 17
Last.Aude Billard (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 52
view all 4 authors...
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