轨道前额皮层是学习调节先天的嗅觉行为的必要条件
Kiana Miyamoto1, Jeremy Stark1, Mayuri Kathrotia1
1Department of Neurobiology, School of Biological Sciences, University of California San Diego, San Diego, California 92093-0357.
eNeuro
|October 15, 2024
概括
在寻找水时,小鼠可以学会克服先天的气味偏好. 轨道前皮层 (OFC) 对于这种学习的行为覆盖至关重要,它调节对气味的天生的反应.
科学领域:
- 神经科学是一个神经科学.
- 动物行为 动物行为
- 嗅觉处理 嗅觉处理
背景情况:
- 动物对环境暗示,如气味,有天生的反应.
- 学习对于适应天生的反应以应对不断变化的需求和风险至关重要.
- 哺乳动物先天嗅觉反应的学习调节机制尚不清楚.
研究的目的:
- 为了研究在小鼠的先天嗅觉反应的学会取消背后的神经机制.
- 通过学习来确定轨道前皮层 (OFC) 在调节先天性气味厌恶中的作用.
主要方法:
- 开发了一种新的嗅觉测试方法,口渴的小鼠可以在水的吸引力和厌恶性气味之间选择.
- 利用光遗传学和化学遗传学沉默技术来使OFC失活.
- 用特定大脑区域的c-fos表达来测量气味唤起的神经活动.
主要成果:
- 当在有吸引力的港口减少了水的供应时,小鼠学会了更喜欢厌恶的气味而不是有吸引力的气味.
- 沉默OFC阻止了先天的气味偏好被学会的覆盖.
- OFC无活化抑制了边缘结构中的神经活动,如杏仁体,侧 septum 和 stria terminalis 的床核.
结论:
- 轨道前皮层 (OFC) 对于先天的嗅觉驱动行为学习调制至关重要.
- OFC向边缘结构发出信号,以取代基于学习值对气味的天生的反应.
- 这项研究揭示了一个神经回路,用于灵活的行为适应,以应对不断变化的环境需求.
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