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Ivan Vujaklija
Aalto University
ElectromyographyReinnervationMotor unitComputer sciencePhysical medicine and rehabilitation
37Publications
11H-index
524Citations
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Publications 39
Newest
#1Arash Andalib (UF: University of Florida)H-Index: 4
#2Dario FarinaH-Index: 76
Last. Jose C. PrincipeH-Index: 65
view all 7 authors...
The performance of upper-limb prostheses is currently limited by the relatively poor functionality of unintuitive control schemes. This paper proposes to extract, from multichannel electromyographic signals (EMG), motor neuron spike trains and project them into lower dimensional continuous signals, which are used as multichannel proportional inputs to control the prosthetic's actuators. These control signals are an estimation of the common synaptic input that the motor neurons receive. We use th...
#1Dennis Yeung (Aalto University)
#2Dario Farina (Imperial College London)H-Index: 76
Last. Ivan Vujaklija (Aalto University)H-Index: 11
view all 3 authors...
Non-negative Matrix Factorization (NMF) has been effective in extracting commands from surface electromyography (EMG) for the control of upper-limb prostheses. This approach enables Simultaneous and Proportional Control (SPC) over multiple degrees-of-freedom (DoFs) in a minimally supervised way. Here, like with other myoelectric approaches, robustness remains essential for clinical adoption, with device donning/doffing being a known cause for performance degradation. Previous research has demons...
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#1Martyna Stachaczyk (Imperial College London)H-Index: 1
#2Seyed Farokh Atashzar (UWO: University of Western Ontario)H-Index: 8
Last. Dario Farina (Imperial College London)H-Index: 76
view all 5 authors...
1 CitationsSource
#2Dario FarinaH-Index: 76
Last. Ivan VujaklijaH-Index: 11
view all 3 authors...
Conventional myoelectric controllers provide a mapping between electromyographic signals and prosthetic functions. However, due to a number of instabilities continuously challenging this process, an initial mapping may require an extended calibration phase with long periods of user-training in order to ensure satisfactory performance. Recently, studies on co-adaptation have highlighted the benefits of concurrent user learning and machine adaptation where systems can cope with deficiencies in the...
Source
#1Tamás Kapelner (GAU: University of Göttingen)H-Index: 4
#2Ivan Vujaklija (Aalto University)H-Index: 11
Last. Dario Farina (Imperial College London)H-Index: 76
view all 7 authors...
Background Current myoelectric control algorithms for active prostheses map time- and frequency-domain features of the interference EMG signal into prosthesis commands. With this approach, only a fraction of the available information content of the EMG is used and the resulting control fails to satisfy the majority of users. In this study, we predict joint angles of the three degrees of freedom of the wrist from motor unit discharge timings identified by decomposition of high-density surface EMG...
1 CitationsSource
Apr 1, 2019 in ICRA (International Conference on Robotics and Automation)
#1Michele Barsotti (Sant'Anna School of Advanced Studies)H-Index: 7
#2Sigrid S. G. Dupan (Radboud University Nijmegen)H-Index: 1
Last. Dario Farina (Imperial College London)H-Index: 76
view all 6 authors...
A hand impairment can have a profound impact on the quality of life. This has motivated the development of dexterous prosthetic and orthotic devices. However, their control with neuromuscular interfacing remains challenging. Moreover, existing myocontrol interfaces typically require an extensive calibration. We propose a minimally supervised, online myocontrol system for proportional and simultaneous finger force estimation based on ridge regression using only individual finger tasks for trainin...
2 CitationsSource
#1Aidan D. RocheH-Index: 10
#2Ben Lakey (Imperial College London)
Last. Oskar C. Aszmann (Medical University of Vienna)H-Index: 25
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Purpose of Review This paper aims to summarise the development trends in upper limb bionics over the past 5 years.
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#1Stefan Salminger (Medical University of Vienna)H-Index: 8
#2Ivan Vujaklija (Imperial College London)H-Index: 11
Last. Oskar C. Aszmann (Medical University of Vienna)H-Index: 25
view all 8 authors...
ObjectiveThe aim of the study was to report normative outcome data of prosthetic hand function in below-elbow amputees using four different objective measurements closely related to activities of daily living.DesignSeventeen patients who underwent prosthetic fitting after unilateral below-elbow ampu
1 CitationsSource
#1Konstantin D. Bergmeister (Medical University of Vienna)H-Index: 5
#2Martin Aman (Medical University of Vienna)H-Index: 3
Last. Oskar C. Aszmann (Medical University of Vienna)H-Index: 25
view all 14 authors...
Selective nerve transfers surgically rewire motor neurons and are used in extremity reconstruction to restore muscle function or to facilitate intuitive prosthetic control. We investigated the neurophysiological effects of rewiring motor axons originating from spinal motor neuron pools into target muscles with lower innervation ratio in a rat model. Following reinnervation, the target muscle’s force regenerated almost completely, with the motor unit population increasing to 116% in functional an...
2 CitationsSource
#1Ivan Vujaklija (Aalto University)H-Index: 11
Robotic manipulators can be controlled in an autonomous way with great precision and dexterity. At the same time they can be equipped with sensors capable of conveying highly precise information on the surroundings, many times superior to that of a human sensory system. However, our limited capacity of interfacing these robots with the human body makes current prosthetic systems to be perceived by the users as simple tools rather than limbs. After decades of developments, osseointegration, selec...
1 CitationsSource
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