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首页> 外文期刊>Advances in anatomy embryology and cell biology. >Corticofugal modulation of sensory information.
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Corticofugal modulation of sensory information.

机译：皮质的感觉信息调制。

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Sensory signals reach the cerebral cortex after having made synapses in different relay stations along the sensory pathway. The flow of sensory information in subcortical relay stations is controlled by the action of precise topographic connections from the neocortex. Several lines of research indicate that the massive corticifugal system improves ongoing subcortical sensory processing and reorganizes the receptive fields in visual, auditory and somatosensory systems. In all these sensory systems cortical neurons mediate both the highly focused positive feedback to subcortical neurons with overlapping receptive fields and a widespread inhibition to "non-matching neurons". This cortical feedback, which has been called "egocentric selection", can play a pivotal role in gating the sensory information that reaches the thalamus and cortex. Thus, corticofugal projections may contribute to selective attention since they enhance neuronal responses for attentionally relevant stimuli and by suppressing sensory responses of distractive stimuli. Also, corticofugal projections enhance oscillatory activity in order to synchronize neurons located in the same or in different relay stations in order to improve sensory processing. In conclusion, corticofugal pathways precisely control sensory transmission through out the central nervous system.
机译：感觉信号在沿着感觉途径的不同中继站中发生突触后到达大脑皮层。皮层下中继站中的感觉信息流是通过新皮层的精确地形连接作用来控制的。几项研究表明，巨大的皮质系统改善了正在进行的皮层下感觉处理，并重新组织了视觉，听觉和体感系统中的感受野。在所有这些感觉系统中，皮质神经元介导高度聚焦的正反馈至具有重叠感受野的皮质下神经元，并广泛抑制“非匹配神经元”。这种皮层反馈被称为“自我中心选择”，在控制到达丘脑和皮层的感觉信息时可以发挥关键作用。因此，皮质皮质预测可能有助于选择性注意，因为它们增强了对注意力相关刺激的神经元反应，并抑制了分散性刺激的感觉反应。同样，皮质的丘脑投射增强了振荡活动，以便使位于相同或不同中继站的神经元同步，从而改善感觉处理。综上所述，皮质八叶神经通路精确控制整个中枢神经系统的感觉传递。

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