Hughes Christopher L, Stieger Kevin C, Chen Keying, Vazquez Alberto L, Kozai Takashi D Y
Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
Center for the Neural Basis of Cognition, Pittsburgh, PA, USA.
iScience. 2025 May 20;28(6):112707. doi: 10.1016/j.isci.2025.112707. eCollection 2025 Jun 20.
Intracortical microstimulation (ICMS) of sensory brain regions can create artificial sensations, yet these percepts fade with continued stimulation, suggesting dynamic changes in underlying neural activity. Using two-photon imaging in transgenic mice, this study examines how prolonged ICMS (30 s) shapes activity in excitatory and inhibitory neurons within the visual cortex. Inhibitory neuron activity was more likely to increase throughout the stimulation period, while excitatory neuron activity was more likely to decrease and be suppressed post-stimulation. Stimulation patterns differentially shaped neuronal engagement: theta-burst stimulation most effectively activated inhibitory neurons, whereas 10-Hz burst most effectively activated excitatory neurons. ICMS evoked more diverse responses in neurons farther from the electrode, reflecting complex synaptic interactions involving inhibition and disinhibition. These results show that ICMS affects excitatory and inhibitory neurons differently over extended durations. Modulation of stimulation patterns may allow for preferential engagement of specific neuron types and shaping of cortical activity.
对感觉脑区进行皮质内微刺激(ICMS)能够产生人工感觉,但这些感知会随着持续刺激而消退,这表明潜在神经活动存在动态变化。本研究利用转基因小鼠的双光子成像技术,探究了长时间(30秒)的ICMS如何塑造视觉皮层内兴奋性和抑制性神经元的活动。在整个刺激期内,抑制性神经元活动更有可能增加,而兴奋性神经元活动更有可能减少,并在刺激后受到抑制。刺激模式以不同方式塑造神经元参与度:theta波爆发刺激最有效地激活抑制性神经元,而10赫兹爆发最有效地激活兴奋性神经元。ICMS在距离电极较远的神经元中引发了更多样化的反应,反映了涉及抑制和去抑制的复杂突触相互作用。这些结果表明,在较长时间内,ICMS对兴奋性和抑制性神经元的影响不同。调节刺激模式可能会使特定神经元类型优先参与,并塑造皮层活动。
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