Enatsu Rei, Nagamine Takashi, Matsubayashi Jun, Maezawa Hitoshi, Kikuchi Takayuki, Fukuyama Hidenao, Mikuni Nobuhiro, Miyamoto Susumu, Hashimoto Nobuo
Department of Neurosurgery, Kyoto University Graduate School of Medicine, Kyoto, Japan.
Human Brain Research Center, Kyoto University Graduate School of Medicine, Kyoto, Japan; Department of Systems Neuroscience, Sapporo Medical University Graduate School of Medicine, Sapporo, Japan.
J Neurol Sci. 2014 Feb 15;337(1-2):201-11. doi: 10.1016/j.jns.2013.12.011. Epub 2013 Dec 12.
The rolandic cortex exhibits spontaneous rhythmic activity. This oscillation can be modulated by somatosensory stimulation and voluntary movement. The purpose of this study is to elucidate the influence of sensory input on the rolandic oscillation in comparison with movement-related oscillation.
Magnetic brain rhythms were recorded in nine healthy subjects in two sessions: electrical stimulation (STIM) of the digital nerve and self-paced movement (SPM) of the right index finger. Thereafter, 10 and 20 Hz oscillatory activities were compared between the two sessions with temporal spectral evolution analysis.
Sensory input altered the rolandic oscillations even under no movement conditions. As for 10 Hz ERD in the STIM session, three subjects showed a contralateral dominant pattern, whereas the remaining subjects showed a bilateral pattern. In spite of this individual variability, ERD showed comparable amplitude in both sessions. However, ERSs in the SPM session were larger than that in the STIM session. These findings might reflect the activation of neural networks common to sensory and motor systems followed by the inhibition of the other surrounding cortical areas.
Our results suggest that rolandic oscillations may reflect the coordination of sensory and motor systems in the neural networks including both sensory and motor systems.
中央沟周围皮质呈现出自发性节律活动。这种振荡可由体感刺激和自主运动调节。本研究的目的是阐明与运动相关振荡相比，感觉输入对中央沟周围振荡的影响。
在两次实验中记录了9名健康受试者的脑磁节律：正中神经电刺激（STIM）和右手食指的自主运动（SPM）。此后，通过时间频谱演变分析比较了两次实验中10Hz和20Hz的振荡活动。
即使在无运动条件下，感觉输入也会改变中央沟周围振荡。对于STIM实验中的10Hz事件相关去同步化（ERD），三名受试者表现出对侧优势模式，而其余受试者表现出双侧模式。尽管存在个体差异，但两次实验中ERD的幅度相当。然而，SPM实验中的事件相关同步化（ERS）大于STIM实验中的ERS。这些发现可能反映了感觉和运动系统共有的神经网络的激活，随后周围其他皮质区域受到抑制。
我们的结果表明，中央沟周围振荡可能反映了包括感觉和运动系统在内的神经网络中感觉和运动系统的协调。
