Olfaction, navigation, and the origin of isocortex
Olfaction, navigation, and the origin of isocortex
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DOI：
10.3389/fnins.2015.00402
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发表时间：
2015-10-27
影响因子：
4.3
通讯作者：
Montiel, Juan F.
中科院分区：
文献类型：
--
作者：
Aboitiz, Francisco;Montiel, Juan F.
哺乳动物和鸟类的大脑在微电路结构方面有显着的相似性，尽管在总体形态和发育方面存在明显差异。在爬行动物和鸟类中，最大的扩展组件（背侧脑室脊）显示出整体的核形状，并来自外侧和腹侧的软腭，而在哺乳动物中，背侧苍白球，六层等皮质显示出最显着的精致。不管对哺乳动物和鸟类大脑之间可能的同源性的讨论，一个主要的问题仍然是在解释哺乳动物的同皮质的出现，因为它代表了一个独特的表型在所有的哺乳动物。在这篇文章中，我们提出，同源皮层的起源是由行为适应，包括嗅觉驱动的目标导向和导航行为。这些适应与感觉发育的增加有关，这为背侧大脑皮层的扩张提供了选择性压力。后者作为嗅觉-海马网络的接口出现，为导航行为提供体感信息。随后，来自视觉和听觉等其他形式的感官输入被招募到这个不断扩大的区域，从而形成了多模式联想网络。
There are remarkable similarities between the brains of mammals and birds in terms of microcircuit architecture, despite obvious differences in gross morphology and development. While in reptiles and birds the most expanding component (the dorsal ventricular ridge) displays an overall nuclear shape and derives from the lateral and ventral pallium, in mammals a dorsal pallial, six-layered isocortex shows the most remarkable elaboration. Regardless of discussions about possible homologies between mammalian and avian brains, a main question remains in explaining the emergence of the mammalian isocortex, because it represents a unique phenotype across amniotes. In this article, we propose that the origin of the isocortex was driven by behavioral adaptations involving olfactory driven goal-directed and navigating behaviors. These adaptations were linked with increasing sensory development, which provided selective pressure for the expansion of the dorsal pallium. The latter appeared as an interface in olfactory-hippocampal networks, contributing somatosensory information for navigating behavior. Sensory input from other modalities like vision and audition were subsequently recruited into this expanding region, contributing to multimodal associative networks.