Publications by authors named "A Botter"
For individuals with motor complete spinal cord injury (SCI), previous works have shown that spared motor neurons below the injury level can still be voluntarily controlled. In this study, we investigated the behavior of these neurons after SCI by analyzing neural and spatial properties of individual motor units using high-density surface electromyography (HDsEMG) and ultrasound imaging. The dataset for this study is based on motor unit data from our previous work (Oliveira et al.
View Article and Find Full Text PDFDespite the progress in the development of innovative EEG acquisition systems, their use in dynamic applications is still limited by motion artifacts compromising the interpretation of the collected signals. Therefore, extensive research on the genesis of motion artifacts in EEG recordings is still needed to optimize existing technologies, shedding light on possible solutions to overcome the current limitations. We identified three potential sources of motion artifacts occurring at three different levels of a traditional biopotential acquisition chain: the skin-electrode interface, the connecting cables between the detection and the acquisition systems, and the electrode-amplifier system.
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- Children with Cerebral Palsy (CP) show less selective and simplified muscle activation while walking due to brain injury and associated muscle changes.
- A study using high-density surface electromyography (HDsEMG) compared muscle activity in adolescents with CP and typically developed (TD) adolescents during treadmill walking, revealing more uniform muscle activation in CP individuals.
- Findings indicate that the less structured muscle activation in CP is linked to stronger ankle co-contraction and spasticity, providing insights into motor control deficits and potential improvements from interventions.
Article Synopsis
- The study investigates how conscious muscle activation affects the brain's response to passive ankle movement by measuring EEG signals during two conditions: relaxed (passive) and actively contracting the muscle (active).
- Twenty-five volunteers participated, undergoing 100 passive ankle rotations while their EEG, EMG, and movement data were recorded to analyze differences in brain activity related to proprioceptive processing.
- Results showed that active muscle engagement led to a significantly stronger brain response (26% more) and increased beta wave suppression (38% more) compared to passive movements, indicating enhanced cortical activation and reduced inhibition during active conditions.
Design and Test of an Intraoral Electrode Grid for Tongue High-Density Electromyography.
IEEE Trans Neural Syst Rehabil Eng
August 2024
Tongue motor function is crucial in a wide range of basic activities and its impairment affects quality of life. The electrophysiological assessment of the tongue relies primarily on needle electromyography, which is limited by its invasiveness and inability to capture the concurrent activity of the different tongue muscles. This work aimed at developing an intraoral grid for high-density surface electromyography (HDsEMG) to non-invasively map the electrical excitation of tongue muscles.
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