Nataša Bizovičar1, Jurij Dreo2, Blaž Koritnik3, Janez Zidar3. 1. Institute of Clinical Neurophysiology, Division of Neurology, University Medical Centre Ljubljana, Slovenia. Electronic address: natasa.bizovicar@gmail.com. 2. Department of Neurology, University Medical Centre Ljubljana, Slovenia. 3. Institute of Clinical Neurophysiology, Division of Neurology, University Medical Centre Ljubljana, Slovenia.
Abstract
OBJECTIVE: This study explored event-related desynchronization (ERD) and synchronization (ERS) in amyotrophic lateral sclerosis (ALS) to quantify cortical sensorimotor processes during volitional movements. We furthermore compared ERD/ERS measures with clinical scores and movement-related cortical potential (MRCP) amplitudes. METHODS: Electroencephalograms were recorded while 21 ALS patients and 19 controls performed two self-paced motor tasks: sniffing and right index finger flexion. Based on Wavelet analysis the alpha and beta frequency bands were selected for subsequent evaluation. RESULTS: Patients generated significantly smaller resting alpha spectral power density (SPD) and smaller beta ERD compared to controls. Additionally patients exhibited merely unilateral post-movement ERS (beta rebound) whereas this phenomenon was bilateral in controls. ERD/ERS amplitudes did not correlate with corresponding MRCPs for either patients or controls. CONCLUSIONS: The smaller resting alpha SPD and beta ERD and asymmetrical appearance of beta ERS in patients compared to controls could be the result of pyramidal cell degeneration and/or corpus callosum involvement in ALS. SIGNIFICANCE: These results support the notion of reduced movement preparation in ALS involving also areas outside the motor cortex. Furthermore post-movement cortical inhibition seems to be impaired in ALS. ERD/ERS and MRCP are found to be independent measures of cortical motor functions in ALS.
OBJECTIVE: This study explored event-related desynchronization (ERD) and synchronization (ERS) in amyotrophic lateral sclerosis (ALS) to quantify cortical sensorimotor processes during volitional movements. We furthermore compared ERD/ERS measures with clinical scores and movement-related cortical potential (MRCP) amplitudes. METHODS: Electroencephalograms were recorded while 21 ALSpatients and 19 controls performed two self-paced motor tasks: sniffing and right index finger flexion. Based on Wavelet analysis the alpha and beta frequency bands were selected for subsequent evaluation. RESULTS:Patients generated significantly smaller resting alpha spectral power density (SPD) and smaller beta ERD compared to controls. Additionally patients exhibited merely unilateral post-movement ERS (beta rebound) whereas this phenomenon was bilateral in controls. ERD/ERS amplitudes did not correlate with corresponding MRCPs for either patients or controls. CONCLUSIONS: The smaller resting alpha SPD and beta ERD and asymmetrical appearance of beta ERS in patients compared to controls could be the result of pyramidal cell degeneration and/or corpus callosum involvement in ALS. SIGNIFICANCE: These results support the notion of reduced movement preparation in ALS involving also areas outside the motor cortex. Furthermore post-movement cortical inhibition seems to be impaired in ALS. ERD/ERS and MRCP are found to be independent measures of cortical motor functions in ALS.
Authors: Malcolm Proudfoot; Gustavo Rohenkohl; Andrew Quinn; Giles L Colclough; Joanne Wuu; Kevin Talbot; Mark W Woolrich; Michael Benatar; Anna C Nobre; Martin R Turner Journal: Hum Brain Mapp Date: 2016-09-13 Impact factor: 5.038
Authors: Malcolm Proudfoot; Giles L Colclough; Andrew Quinn; Joanne Wuu; Kevin Talbot; Michael Benatar; Anna C Nobre; Mark W Woolrich; Martin R Turner Journal: Neurology Date: 2018-03-21 Impact factor: 9.910