Time, frequency and volumetric differences of high-frequency neuromagnetic oscillation between left and right somatosensory cortices
Time, frequency and volumetric differences of high-frequency neuromagnetic oscillation between left and right somatosensory cortices
复制标题
DOI：
10.1016/j.ijpsycho.2008.10.009
复制
发表时间：
2009-05-01
影响因子：
3
通讯作者：
deGrauw, Ton
中科院分区：
文献类型：
--
作者：
Kotecha, Rupesh;Xiang, Jing;deGrauw, Ton
大脑高级功能（例如语言）的半球专门化或不对称性已被广泛接受。本研究旨在定量确定半球不对称性是否可以在体感系统中测量。 22 名参与者接受了脑磁图 (MEG) 研究，同时他们的左右食指按随机顺序受到刺激。使用基于小波的波束形成器对皮质中的手指表示进行体积定位。功能活动的强度是通过强度体积来估计的，而虚拟传感器的波形是通过放置在局部手指区域中心的虚拟传感器来计算的。结果表明，左手指刺激引起的首次可识别反应的潜伏期明显短于右手指刺激引起的潜伏期（p
Hemispheric specialization or asymmetry in higher brain functions such as language is well accepted. This study was designed to quantitatively determine if the hemispheric asymmetry is measurable in the somatosensory system. Twenty-two participants were studied with magnetoencephalography (MEG) while their left and right index fingers were stimulated in randomized order. The finger representation in the cortex was volumetrically localized using a wavelet based beamformer. The strength of functional activity was estimated with an intensity volume while the waveforms of the virtual sensors were computed with a virtual sensor placed in the center of localized finger area. The results showed that the latency of the first identifiable response evoked by left finger stimulation was significantly shorter than that evoked by right finger stimulation (p