首页> 外文会议>Engineering in Medicine and Biology Society, 1998. Proceedings of the 20th Annual International Conference of the IEEE >Spectral correlation of action potential firing rates after hypoxic-ischemic brain injury
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Spectral correlation of action potential firing rates after hypoxic-ischemic brain injury

机译:缺氧缺血性脑损伤后动作电位放电率的光谱相关性

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During recovery from hypoxia-ischemic (HI) injury microelectrode recordings of multiple action potentials from thalamus exhibit periodic oscillations. Firing rate variability analysis reveals that spike frequency is periodically modulated by a low frequency oscillation called spindle. This leads to spectral self-coherences among firing rate components during spindle episodes. In an animal model of cerebral injury the authors monitor neural responses from the VPL (ventral-posterior lateral) thalamic nucleus after 3 min of total asphyxia. Spindling episodes of VPL multiple unit responses appear within the first 5 min of recovery. These spindles modulate the multi-unit activity at the rate of approximately 10 Hz. Interspike intervals (ISI) fluctuate from 2 to 10 ms during these burst periods. Frequency coupling occurs between frequencies in the 100 Hz to 300 Hz range (p>0.01) induced by the spindle envelope. Thus, spectral correlation analysis accurately captures the low frequency modulation of action potentials from a short segment of data.
机译:在从缺氧缺血(HI)损伤中恢复的过程中,来自丘脑的多个动作电位的微电极记录显示出周期性的振荡。点火速率可变性分析表明,尖峰频率由称为主轴的低频振荡周期性地调制。这会导致心轴发作期间发射率分量之间的频谱自相干。在脑损伤的动物模型中,作者监测了总窒息3分钟后丘脑核VPL(腹侧-后外侧)的神经反应。 VPL多单位反应的纺锤状发作出现在恢复的前5分钟内。这些纺锤体以大约10 Hz的速率调节多单元活性。在这些突发周期内,尖峰间隔(ISI)在2到10毫秒之间波动。频率耦合发生在主轴包络线引起的100 Hz至300 Hz范围内的频率之间(p> 0.01)。因此,频谱相关分析可以从一小段数据中准确捕获动作电位的低频调制。

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