von Lautz Alexander H, Herding Jan, Ludwig Simon, Nierhaus Till, Maess Burkhard, Villringer Arno, Blankenburg Felix
Neurocomputation and Neuroimaging Unit, Department of Education and Psychology, Freie Universität Berlin, Berlin, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany.
Front Hum Neurosci. 2017 Dec 4;11:576. doi: 10.3389/fnhum.2017.00576. eCollection 2017.
Ample evidence suggests that oscillations in the beta band represent quantitative information about somatosensory features during stimulus retention. Visual and auditory working memory (WM) research, on the other hand, has indicated a predominant role of gamma oscillations for active WM processing. Here we reconciled these findings by recording whole-head magnetoencephalography during a vibrotactile frequency comparison task. A Braille stimulator presented healthy subjects with a vibration to the left fingertip that was retained in WM for comparison with a second stimulus presented after a short delay. During this retention interval spectral power in the beta band from the right intraparietal sulcus and inferior frontal gyrus (IFG) monotonically increased with the to-be-remembered vibrotactile frequency. In contrast, induced gamma power showed the inverse of this pattern and decreased with higher stimulus frequency in the right IFG. Together, these results expand the previously established role of beta oscillations for somatosensory WM to the gamma band and give further evidence that quantitative information may be processed in a fronto-parietal network.
大量证据表明，在刺激保持期间，β波段的振荡代表了有关体感特征的定量信息。另一方面，视觉和听觉工作记忆（WM）研究表明，γ振荡在主动WM处理中起主要作用。在这里，我们通过在振动触觉频率比较任务期间记录全脑磁脑电图来协调这些发现。一个盲文刺激器向健康受试者的左手指尖施加振动，该振动被保留在工作记忆中，以便与短时间延迟后呈现的第二个刺激进行比较。在这个保持间隔期间，来自右侧顶内沟和额下回（IFG）的β波段频谱功率随着要记忆的振动触觉频率单调增加。相反，诱发的γ功率呈现出相反的模式，并且在右侧IFG中随着刺激频率的增加而降低。总之，这些结果将β振荡在体感工作记忆中的先前确立的作用扩展到了γ波段，并进一步证明定量信息可能在额顶网络中进行处理。
