event related desynchronisation
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2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Toshihiko Araki ◽  
Yoshiyuki Watanabe ◽  
Masayuki Hirata

Abstract Event-related synchronisation (ERS) and event-related desynchronisation (ERD) have been observed via magnetoencephalography (MEG) in the language-dominant hemisphere. However, the relationship between ERS/ERD and clinical language indices is unclear. Therefore, the present study evaluated brain activity utilising MEG during a verb generation task in 36 subjects and determined ERS/ERD power values in θ, α, β, low γ and high γ frequency bands. To measure clinical language indices, we adopted Wechsler Memory Scale-revised. We observed ERD in the α band from the bilateral occipital to the left central brain region, in the β band from the bilateral occipital to the left frontal region and in the low γ band a high-power signal in the left frontal region. We also observed ERS in the θ band in bilateral frontal region and in the high γ band in bilateral occipital region. Furthermore, we found a significant negative correlation between α-band ERD power at the left postcentral gyrus and medial superior frontal gyrus and verbal memory score (correlation coefficients =  − 0.574 and − 0.597, respectively). These results suggest that individuals with lower linguistic memory have less desynchronised α-band ERD power and α-band ERD power in the left hemisphere may be a neurophysiological biomarker for verbal memory.


2019 ◽  
Vol 44 (3) ◽  
pp. 235-245 ◽  
Author(s):  
Greeshma Sharma ◽  
Ronnie Daniel ◽  
Sushil Chandra ◽  
Ram Singh

2018 ◽  
Vol 39 (1) ◽  
pp. 54-69 ◽  
Author(s):  
Yi-Hung Liu ◽  
Li-Fong Lin ◽  
Chun-Wei Chou ◽  
Yun Chang ◽  
Yu-Tsung Hsiao ◽  
...  

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4492 ◽  
Author(s):  
Sébastien Rimbert ◽  
Rahaf Al-Chwa ◽  
Manuel Zaepffel ◽  
Laurent Bougrain

There is fundamental knowledge that during the resting state cerebral activity recorded by electroencephalography (EEG) is strongly modulated by the eyes-closed condition compared to the eyes-open condition, especially in the occipital lobe. However, little research has demonstrated the influence of the eyes-closed condition on the motor cortex, particularly during a self-paced movement. This prompted the question: How does the motor cortex activity change between the eyes-closed and eyes-open conditions? To answer this question, we recorded EEG signals from 15 voluntary healthy subjects who performed a simple motor task (i.e., a voluntary isometric flexion of the right-hand index) under two conditions: eyes-closed and eyes-open. Our results confirmed strong modulation in the mu rhythm (7–13 Hz) with a large event-related desynchronisation. However, no significant differences have been observed in the beta band (15–30 Hz). Furthermore, evidence suggests that the eyes-closed condition influences the behaviour of subjects. This study gives us greater insight into the motor cortex and could also be useful in the brain-computer interface (BCI) domain.


2016 ◽  
Vol 31 ◽  
pp. 116-118 ◽  
Author(s):  
A.M. Meppelink ◽  
S. Little ◽  
A. Oswal ◽  
R. Erro ◽  
J. Kilner ◽  
...  

2014 ◽  
Vol 125 ◽  
pp. S61
Author(s):  
M. Rakusa ◽  
A. Belic ◽  
P.P. Battaglini ◽  
I. Zidar ◽  
J. Zidar

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