Role of anterior olfactory nucleus for multi-sensory integration in the olfactory system

项目摘要 在不同情况下遇到的感觉信号可能会有非常不同的含义。在 早期嗅觉系统，初步证据表明，这种(非嗅觉)上下文信息是 在非常早期的阶段就被整合到气味表示中，甚至可能是主要的嗅球。近期 证据表明，前嗅核(AON)是一种直接毗邻嗅球的结构， 用于整合传入气味信息和来自腹侧海马体的上下文信息 (VHC)，并且是解决上下文依赖的嗅觉决策任务所必需的。 众所周知，VHC将与任务相关的空间背景信息传递给其他大脑系统。我们在这里 假设从VHC到Aon的直接投射在整合 上下文和嗅觉信息，并且怡安将这种多感官上下文信息嵌入到 早期气味表征。我们的初步数据显示，啮齿动物可以学习对 气味基于遇到它们的空间环境，并且这种规则的表达 取决于Aon和VHC，而类似但不依赖气味的任务需要VHC，但不需要Aon。 我们提出了一种多管齐下的方法来理解空间语境与嗅觉的整合 表象、参与电生理合奏记录和区域间一致性 清醒的行为啮齿动物的测量，VHC和AON电路活动的光遗传操作， 以及用于即刻早期基因(Fos)反应的受试者内比较的双标记策略 在时间上分开的两个实验条件下。 补充摘要：梨状皮质(PC)与OB、AON和VHC紧密相连， 可能参与了类似的加工。计划的其他目标包括测试PC的假设 执行对AON的补充功能，并参与上下文处理。

Project Summary Sensory signals encountered under different circumstances may have quite different implications. In the early olfactory system, preliminary evidence suggests that this (non-olfactory) contextual information is integrated into odor representations at a very early stage, potentially even the main olfactory bulb. Recent evidence indicates that the anterior olfactory nucleus (AON), a structure directly adjoining the olfactory bulb, serves to integrate afferent odor information with contextual information from the ventral hippocampus (vHC) and is necessary to solve contextually-dependent olfactory decision-making tasks. The vHC is known to relay task-relevant spatial contextual information to other brain systems. We here hypothesize that direct projections from the vHC to the AON play a dominant role in the integration of contextual and olfactory information, and that the AON embeds this multisensory contextual information into early-stage odor representations. Our preliminary data show that rodents can learn to respond differently to odors based on the spatial context in which they are encountered, and that the expression of such a rule depends on both AON and vHC, whereas a similar but odor-independent task requires vHC but not AON. We propose a multipronged approach to understanding the integration of spatial context into olfactory representations, engaging electrophysiological ensemble recordings and interareal coherence measurements in awake, behaving rodents, the optogenetic manipulation of vHC and AON circuit activities, and a double-labeling strategy for the within-subjects comparison of immediate-early gene (Fos) responses across two experimental conditions separated in time. Supplement summary: Piriform cortex (PC), is tightly interconnected with OB, AON and vHC and potentially involved in similar processed. The additional Aims planned include testing the hypothesis that PC performs complementary functions to AON and is involved in contextual processing.