Characterization of Artifacts Produced by Gel Displacement on Non-invasive Brain-Machine Interfaces during Ambulation
| العنوان: | Characterization of Artifacts Produced by Gel Displacement on Non-invasive Brain-Machine Interfaces during Ambulation |
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| المؤلفون: | Andrés Úbeda, Álvaro Costa, Rocio Salazar-Varas, José M. Azorín |
| المصدر: | Frontiers in Neuroscience, Vol 10 (2016) Frontiers in Neuroscience |
| بيانات النشر: | Frontiers Media SA, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | conductive gel, 030506 rehabilitation, medicine.medical_specialty, Electroencephalography, lcsh:RC321-571, rehabilitation, 03 medical and health sciences, 0302 clinical medicine, Gait (human), Motor imagery, Gait training, medicine, lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry, Original Research, Brain–computer interface, medicine.diagnostic_test, General Neuroscience, artifact, Spectral density, Surgery, Amplitude, medicine.anatomical_structure, Scalp, human gait, 0305 other medical science, Psychology, brain-machine interface, electroencephalography, 030217 neurology & neurosurgery, Neuroscience, Biomedical engineering |
| الوصف: | So far, Brain-Machine Interfaces (BMIs) have been mainly used to study brain potentials during movement-free conditions. Recently, due to the emerging concern of improving rehabilitation therapies, these systems are also being used during gait experiments. Under this new condition, the evaluation of motion artifacts has become a critical point to assure the validity of the results obtained. Due to the high signal to noise ratio provided, the use of wet electrodes is a widely accepted technic to acquire electroencephalographic (EEG signals). To perform these recordings it is necessary to apply a conductive gel between the scalp and the electrodes. This work is focused on the study of gel displacements produced during ambulation and how they affect the amplitude of EEG signals. Data recorded during three ambulation conditions (gait training) and one movement-free condition (BMI motor imagery task) are compared to perform this study. Two phenomenons, manifested as unusual increases of the signals' amplitude, have been identified and characterized during this work. Results suggest that they are caused by abrupt changes on the conductivity between the electrode and the scalp due to gel displacement produced during ambulation and head movements. These artifacts significantly increase the Power Spectral Density (PSD) of EEG recordings at all frequencies from 5 to 90 Hz, corresponding to the main bandwidth of electrocortical potentials. They should be taken into consideration before performing EEG recordings in order to asses the correct gel allocation and to avoid the use of electrodes on certain scalp areas depending on the experimental conditions. |
| تدمد: | 1662-453X |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9550962a8a8dda3b680efca4be222b4fTest https://doi.org/10.3389/fnins.2016.00060Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....9550962a8a8dda3b680efca4be222b4f |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1662453X |
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