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首页> 外文期刊>Neuroscience Research: The Official Journal of the Japan Neuroscience Society >Correlation between stimulation strength and onset time of signal traveling within the neocortical neural circuits under caffeine application.
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Correlation between stimulation strength and onset time of signal traveling within the neocortical neural circuits under caffeine application.

机译:咖啡因应用下刺激强度与信号在新皮层神经回路内传播的开始时间之间的相关性。

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摘要

In general, strength of input to neocortical neural circuits affects the amplitude of postsynaptic potentials (PSPs), thereby modulating the way signals are transmitted within the circuits. Caffeine is one of the pharmacological agents able to modulate synaptic activities. The present study investigated how strength of input affects signal propagation in neocortical circuits under the application of caffeine. Spatio-temporal neural activities were observed from visual cortical slices of rats using optical recording methods with voltage-sensitive dye. Electrical stimulations were applied to white matter in the primary visual cortex with bath-application of caffeine. When the strength of stimulation was 0.3mA, signals propagated from the site of stimulation in the primary visual cortex toward the secondary visual cortex along vertical and horizontal pathways. When stimulation strength was reduced from 0.3mA to 0.07mA, start of signal propagation was delayed about 25ms without affecting field PSP amplitude or the manner of signal propagation. Conversely, co-application of caffeine and d-2-amino-5-phosphonovaleric acid (d-AP5) did not induce delays in signal start. These findings suggest that conversion of neural code from amplitude code to temporal code is inducible at the level of neocortical circuits in an N-methyl-d-aspartate (NMDA) receptor activity-dependent manner.
机译:通常,新皮质神经回路的输入强度会影响突触后电位(PSP)的幅度,从而调节信号在回路内的传输方式。咖啡因是能够调节突触活性的药物之一。本研究调查了咖啡因的应用下输入强度如何影响新皮质电路中的信号传播。使用电压敏感染料的光学记录方法从大鼠的视觉皮层切片观察到时空神经活动。电刺激通过浸入咖啡因的方式,对初级视觉皮层的白质进行刺激。当刺激强度为0.3mA时,信号从刺激部位在主视觉皮层沿垂直和水平路径传播到次要视觉皮层。当刺激强度从0.3mA降低到0.07mA时,信号传播的开始被延迟了大约25ms,而不会影响场PSP幅度或信号传播的方式。相反,咖啡因和d-2-氨基-5-膦酰戊酸(d-AP5)的共同应用不会引起信号启动延迟。这些发现表明,可以在神经皮质回路水平以N-甲基-d-天冬氨酸(NMDA)受体活性依赖性的方式将神经代码从幅度代码转换为时间代码。

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