Title :
Analysis of the effects of mechanically induced tremor on EEG-EMG coherence using wavelet and partial directed coherence
Author :
McManus, Lara M. ; Budini, Francesco ; Di Russo, Francesco ; Berchicci, Marika ; Menotti, Federica ; Macaluso, Andrea ; De Vito, Gabriele ; Lowery, M.M.
Author_Institution :
Sch. of Electr., Univ. Coll. Dublin, Dublin, Ireland
Abstract :
Corticomuscular coherence between human cortical rhythms and surface electromyography (sEMG) is commonly observed within the beta (13-35 Hz) and gamma (35-60 Hz) band frequency ranges, but is typically absent within the alpha band (8-12 Hz) in healthy subjects. A recent study has shown that significant alpha band corticomuscular coherence can be mechanically induced in healthy subjects using a spring of appropriate stiffness. Traditional coherence analysis is limited to examining whether a correlation exists between the electroencephalograph (EEG) and EMG recordings, by portraying instances of mutual synchrony. In this study the temporal evolution and directionality of the interaction between the EEG and EMG signals during mechanically induced alpha band coherence were investigated using two recent extensions of classical coherence, wavelet analysis and partial directed coherence. The results indicate a significant increase in directional information flow within the alpha and piper band frequency ranges in the EMG to EEG direction, and appear to provide evidence of the contribution of afferent feedback, and to a lesser extent descending cortical drives, to alpha band corticomuscular coherence.
Keywords :
elastic constants; electroencephalography; electromyography; medical signal processing; neurophysiology; wavelet transforms; EEG recording; EEG signal; EEG-EMG coherence; EMG recording; EMG signal; afferent feedback contribution; alpha band corticomuscular coherence; beta band frequency; classical coherence; cortical drives; directional information flow; electroencephalography; frequency 13 Hz to 35 Hz; frequency 35 Hz to 60 Hz; frequency 8 Hz to 12 Hz; gamma band frequency; human cortical rhythms; mechanically induced alpha band coherence; mechanically induced tremor; mutual synchrony; partial directed coherence; piper band frequency; sEMG; spring stiffness; surface electromyography; temporal evolution; traditional coherence analysis; wavelet analysis; Brain modeling; Coherence; Electroencephalography; Electromyography; Muscles; Oscillators; Springs;
Conference_Titel :
Neural Engineering (NER), 2013 6th International IEEE/EMBS Conference on
Conference_Location :
San Diego, CA
DOI :
10.1109/NER.2013.6695996