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文献 归档 | Jack's Space

Early tagging of cortical networks is required for the formation of enduring associative memory. Spontaneous changes of neocortical code for associative memory during consolidation. Hypothalamic modulation of adult hippocampal neurogenesis in mice confers activity-dependent regulation of memory and anxiety-like behavior. Hippocampal-amygdala memory circuits govern experience-dependent observational fear Ripple-selective GABAergic projection cells in the hippocampus. Glutamatergic synapses from the insular cortex to the basolateral amygdala encode observational pain. Distinct signals in medial and lateral VTA dopamine neurons modulate fear extinction at different times. Amount of fear extinction changes its underlying mechanisms.
VTA dopamine neuron activity encodes social interaction and promotes reinforcement learning through social prediction error.
阿杰 Jack · 2022-04-27 · via 文献 归档 | Jack's Space

通讯作者

Camilla Bellone

Introduction:

  1. VTA dopamine neuron
    • Reward prediction errors

Results:

  • DAT-Cre 小鼠注射ChR2的病毒,通过神经元对光的反应可以判断哪些为多巴胺能神经元
    • 小鼠社交行为越多,DA neuron放电越多
  • 单向或者双向互动,更多比例的多巴胺神经元发电增加,被动互动比例比较少
  • 做了三天,每天社交互动5分钟,随着互动次数增多,小鼠嗅探时间减少,DA neuron放电也减弱
  • 训练小鼠进行操作式条件反射的社交行为

实验小鼠在熟练学习后,按下杠杆后会快速跑到社交鼠。

对于小鼠来说,social是一个奖赏信息。

  • DA neuron的反应随着操作性条件反射的学习,放电高峰逐渐迁移到按压杠杆的时候。与前面的prediction errors的情况相似。
  • 修改了行为学范式,当把设定改为,按压杠杆,有50%的概率可以得到social interaction
    • 当按压杠杆后,得不到social interaction时,会出现一个DA neuron放电的抑制,而得到social interaction时就没有抑制。

当小鼠按压杠杆后,在互动期间,用光遗传学抑制多巴胺神经元的活动。发现小鼠按压杠杆的意愿下降。

参考文献

Solié, Clément, et al. “VTA dopamine neuron activity encodes social interaction and promotes reinforcement learning through social prediction error.” Nature neuroscience 25.1 (2022): 86-97.