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首页> 外文期刊>Experimental Brain Research >Crossmodal projections from somatosensory area SIV to the auditory field of the anterior ectosylvian sulcus (FAES) in Cat: further evidence for subthreshold forms of multisensory processing.
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Crossmodal projections from somatosensory area SIV to the auditory field of the anterior ectosylvian sulcus (FAES) in Cat: further evidence for subthreshold forms of multisensory processing.

机译：从体感区SIV到猫前外沟（FAES）的听觉场的交叉峰形投影：多阈值形式的多感觉处理的进一步证据。

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摘要

To date, evaluation of the neuronal basis for multisensory processing has focused on the convergence pattern that provides excitation from more than one sensory modality. However, a recent study (Dehner et al. in Cereb Cortex 14:387-401, 2004) has demonstrated excitatory-inhibitory multisensory effects that do not follow this conventional pattern and the present investigation documented a similar example of subthreshold cross-modal effects. Neuroanatomical tracers revealed that pyramidal neurons of the somatosensory area SIV project to the auditory field of the anterior ectosylvian sulcus (FAES), but subsequent electrophysiological tests showed that stimulation of SIV failed to elicit the expected orthodromic responses in FAES. Instead, combined auditory-SIV stimulation significantly suppressed FAES responses to auditory cues in approximately 25% of the neurons tested, and facilitated responses in another 5%. These modulatory responses in auditory FAES were similar in kind to those observed in somatosensory SIV and, as such, comprise further evidence for subthreshold forms of multisensory processing in cortex. Consequently, it seems likely that subthreshold cross-modal effects may impact other apparently 'unimodal' areas of the brain.
机译：迄今为止，对多感觉处理的神经元基础的评估已集中在会聚模式上，该模式可从一种以上的感觉模式中提供刺激。然而，最近的研究（Dehner等人在Cereb Cortex 14：387-401，2004）已经证明了不遵循这种常规模式的兴奋性抑制性多感官作用，并且本研究记录了亚阈值交叉模式作用的类似实例。神经解剖学示踪剂显示，体感区SIV的锥体神经元投射到前外yl沟（FAES）的听觉区域，但随后的电生理测试表明，对SIV的刺激未能引起FAES预期的正畸反应。相反，组合的听觉SIV刺激可在大约25％的受试神经元中显着抑制FAES对听觉提示的反应，而在另外5％的情况下可促进反应。在听觉FAES中，这些调节反应的种类与在体感SIV中观察到的相似，因此，它们为皮层中多阈处理的亚阈值形式提供了进一步的证据。因此，阈下交叉模式效应似乎可能影响大脑其他明显的“单峰”区域。

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