Voltage-sensitive dye imaging of transcranial magnetic stimulation-induced intracortical dynamics

被引:52
作者
Kozyrev, Vladislav [1 ]
Eysel, Ulf T. [2 ]
Jancke, Dirk [1 ]
机构
[1] Ruhr Univ Bochum, Opt Imaging Grp, Inst Neuroinformat, D-44780 Bochum, Germany
[2] Ruhr Univ Bochum, Dept Neurophysiol, D-44780 Bochum, Germany
关键词
excitation-inhibition balance; plasticity; primary visual cortex; PRIMARY VISUAL-CORTEX; HUMAN MOTOR CORTEX; THETA-BURST-STIMULATION; EVOKED-POTENTIALS; IN-VIVO; COGNITIVE NEUROSCIENCE; POPULATION RESPONSES; CORTICAL DYNAMICS; BARREL CORTEX; LOW-FREQUENCY;
D O I
10.1073/pnas.1405508111
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Transcranial magnetic stimulation (TMS) is widely used in clinical interventions and basic neuroscience. Additionally, it has become a powerful tool to drive plastic changes in neuronal networks. However, highly resolved recordings of the immediate TMS effects have remained scarce, because existing recording techniques are limited in spatial or temporal resolution or are interfered with by the strong TMS-induced electric field. To circumvent these constraints, we performed optical imaging with voltage-sensitive dye (VSD) in an animal experimental setting using anaesthetized cats. The dye signals reflect gradual changes in the cells' membrane potential across several square millimeters of cortical tissue, thus enabling direct visualization of TMS-induced neuronal population dynamics. After application of a single TMS pulse across visual cortex, brief focal activation was immediately followed by synchronous suppression of a large pool of neurons. With consecutive magnetic pulses (10 Hz), widespread activity within this "basin of suppression" increased stepwise to suprathreshold levels and spontaneous activity was enhanced. Visual stimulation after repetitive TMS revealed long-term potentiation of evoked activity. Furthermore, loss of the "deceleration-acceleration" notch during the rising phase of the response, as a signature of fast intracortical inhibition detectable with VSD imaging, indicated weakened inhibition as an important driving force of increasing cortical excitability. In summary, our data show that high-frequency TMS changes the balance between excitation and inhibition in favor of an excitatory cortical state. VSD imaging may thus be a promising technique to trace TMS-induced changes in excitability and resulting plastic processes across cortical maps with high spatial and temporal resolutions.
引用
收藏
页码:13553 / 13558
页数:6
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