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Malavika Ramarao¹, Caleb Jones¹, Jesse H Goldberg¹

¹Department of Neurobiology and Behavior, Cornell University, Ithaca, NY, United States of America.

|November 16, 2023

概括

歌鸟中的多巴胺通路在发育早期分离. 在唱歌体验之前,明确的腹膜区域 (VTA) 神经元投射到X区域或中枢纹状区域 (MST),随着时间的推移,X区域通路会扩大.

科学领域:

神经科学是一个神经科学.
发展生物学发展生物学
动物行为动物行为

背景情况:

大脑中的多巴胺 (DA) 途径传递出明显的强化信号.
在成年歌鸟中,VTA DA神经元投射到X区域 (歌曲学习) 或MST (非歌曲相关).
这些通路的分离及其对歌唱经验的依赖性尚未完全理解.

研究的目的:

调查VTA-到状腺DA通路的结构和功能分离是否取决于歌唱经验.
在歌曲学习之前和期间检查这些途径的发展轨迹.

主要方法:

对幼鸟和成年歌鸟进行了解剖学研究.
在不同的发育阶段分析了大脑:早期的青少年 (化后30-35天),晚期的青少年 (60-65dph) 和成年人 (>90dph).
进行了对X区域和MST区域的VTA预测的定量比较.

主要成果:

在重要的声乐练习之前,在幼鸟中,不同的VTA神经元向X区或MST区域发射.
在开发过程中,在VTA中观察到X区域投射神经元相对于MST投射神经元的超大扩张.
这表明这些路径的空间分离存在于声学学习之前.

结论:

在声乐练习之前,用于社交沟通的中层DA系统在空间上被隔离.
发育因素,而不仅仅是歌唱经验,塑造了这些独特的DA路径的分离.
这种早期的分离支持了复杂的通信系统的发展.

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