Computational protocol: Non-invasive control interfaces for intention detection in active movement-assistive devices

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Protocol publication

[…] The stiffness of muscle tissue increases when it contracts. The measured force signals resulting from this phenomenon are known as myotonic (MT) [] or myokinetic (MKT) [] signals. These signals have been measured using arrays of force-sensitive resistors (FSRs) [] or strain gauges [, ]. A recent study by Castellini and Koiva [] used a tactile sensor placed between the arm and the table to measure changes in pressure distribution at the ventral side of the forearm while performing a variable force task with the fingertip. The authors report that the fingertip forces could be estimated with a high degree of accuracy from the pressure distribution measured at the forearm.Recently, a study by Han et al. [] presented a novel muscle stiffness sensor that could be worn over clothing, based on the measurement of the muscle resonance frequency. This sensor measured muscle stiffness by generating and sensing resonance vibrations using a piezoelectric transducer: As the muscle became stiffer, the resonance frequency became higher.Muscle-stiffness-based interfaces are still in the early phases of research and development, and therefore their potential value as control interfaces for active movement-assistive devices remains unclear. None of the aforementioned studies reported results from experiments implementing this sensing modality in an assistive device and testing it with people with movement impairments. […]

Pipeline specifications

Software tools MUSCLE, MKT
Applications Population genetic analysis, Nucleotide sequence alignment
Organisms Homo sapiens
Diseases Genetic Diseases, Inborn