التفاصيل البيبلوغرافية
| العنوان: |
Extraction of single-trial cortical beta oscillatory activities in EEG signals using empirical mode decomposition |
| المؤلفون: |
Yeh, Chia-Lung, Chang, Hsiang-Chih, Wu, Chi-Hsun, Lee, Po-Lei |
| المصدر: |
BioMedical Engineering OnLine ; volume 9, issue 1 ; ISSN 1475-925X |
| بيانات النشر: |
Springer Science and Business Media LLC |
| سنة النشر: |
2010 |
| مصطلحات موضوعية: |
Radiology, Nuclear Medicine and imaging, Biomedical Engineering, General Medicine, Biomaterials, Radiological and Ultrasound Technology |
| الوصف: |
Background Brain oscillatory activities are stochastic and non-linearly dynamic, due to their non-phase-locked nature and inter-trial variability. Non-phase-locked rhythmic signals can vary from trial-to-trial dependent upon variations in a subject's performance and state, which may be linked to fluctuations in expectation, attention, arousal, and task strategy. Therefore, a method that permits the extraction of the oscillatory signal on a single-trial basis is important for the study of subtle brain dynamics, which can be used as probes to study neurophysiology in normal brain and pathophysiology in the diseased. Methods This paper presents an empirical mode decomposition (EMD)-based spatiotemporal approach to extract neural oscillatory activities from multi-channel electroencephalograph (EEG) data. The efficacy of this approach manifests in extracting single-trial post-movement beta activities when performing a right index-finger lifting task. In each single trial, an EEG epoch recorded at the channel of interest (CI) was first separated into a number of intrinsic mode functions (IMFs). Sensorimotor-related oscillatory activities were reconstructed from sensorimotor-related IMFs chosen by a spatial map matching process. Post-movement beta activities were acquired by band-pass filtering the sensorimotor-related oscillatory activities within a trial-specific beta band. Signal envelopes of post-movement beta activities were detected using amplitude modulation (AM) method to obtain post-movement beta event-related synchronization (PM-bERS). The maximum amplitude in the PM-bERS within the post-movement period was subtracted by the mean amplitude of the reference period to find the single-trial beta rebound (BR). Results The results showed single-trial BRs computed by the current method were significantly higher than those obtained from conventional average method ( P < 0.01; matched-pair Wilcoxon test). The proposed method provides high signal-to-noise ratio (SNR) through an EMD-based decomposition and ... |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| DOI: |
10.1186/1475-925x-9-25 |
| DOI: |
10.1186/1475-925X-9-25.pdf |
| الإتاحة: |
https://doi.org/10.1186/1475-925x-9-25Test |
| رقم الانضمام: |
edsbas.ED563B88 |
| قاعدة البيانات: |
BASE |
