Complex spatial representations in the hippocampal formation and related cortical areas require input from the head direction system. However, a recurrent finding is that behavior apparently supported by these spatial representations does not appear to require input from generative head direction regions, i.e., lateral mammillary nuclei (LMN). Spatial tasks that tax direction discrimination should be particularly sensitive to the loss of head direction information, however, this has been repeatedly shown not to be the case. A further dissociation between electrophysiological properties of the head direction system and behavior comes in the form of geometric-based navigation which is impaired following lesions to the head direction system, yet head direction cells are not normally guided by geometric cues. We explore this apparent mismatch between behavioral and electrophysiological studies and highlight future experiments that are needed to generate models that encompass both neurophysiological and behavioral findings.

中文翻译：

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为什么不需要定向系统？乳头外侧核的教训。

海马结构和相关皮层区域中的复杂空间表示需要来自头部方向系统的输入。但是，一个经常性的发现是，这些空间表示形式显然支持的行为似乎并不需要来自生成的头部方向区域（即外侧乳突（LMN））的输入。关于税收方向歧视的空间任务应该对头部信息的丢失特别敏感，但是，反复证明事实并非如此。头部方向系统的电生理特性与行为之间的进一步分离以基于几何的导航形式出现，这种导航在损害头部方向系统后会受到损害，但是头部方向细胞通常不会受到几何提示的引导。