厌恶诱导的多巴胺减少可以预测吸毒和逃避行为
Elaine M Grafelman1, Bridgitte E Côté1, Lisa Vlach1
1Department of Biomedical Sciences, Marquette University, Milwaukee, WI, 53233, USA.
概括
厌恶性刺激会降低核聚合核 (NAcC) 中的多巴胺,促进寻找药物和逃避行为. 这种多巴胺信号传递机制始终受到厌恶的影响,影响适应性和不适应性行为.
科学领域:
- 神经科学是一个神经科学.
- 行为科学 行为科学
背景情况:
- 核心核 (NAcC) 中多巴胺释放与有动机的行为有关.
- 抑制多巴胺信号传递可以矛盾地增加行为,特别是在药物自我管理期间.
- 厌恶刺激在调节多巴胺和不同环境中的行为中的确切作用尚不清楚.
研究的目的:
- 调查厌恶刺激编码和行为促进的统一性.
- 在不同的实验设计中比较对厌恶刺激的生理和行为反应.
- 为了确定是否通过厌恶刺激减少多巴胺信号传递是一个可概括的机制.
主要方法:
- 纤维光度被用来测量NAcC多巴胺释放在雄性和雌性大鼠.
- 实验涉及可卡因自我管理与间歇性厌恶的白噪声.
- 一个单独的逃生设计测量了操作者响应期间的多巴胺变化,以终止厌恶的白噪声.
主要成果:
- 在自我管理和逃跑设计中,厌恶性白噪声显著降低了NAcC多巴胺.
- 同样的厌恶刺激增加了可卡因的自我管理,并促进了逃跑行为.
- 在这两种情况下,多巴胺减少的程度与行为表现相关.
结论:
- 厌恶性刺激自然会在NAcC中参与多巴胺信号通路,导致多巴胺减少.
- 这种多巴胺减少是一种常见的生理特征,促进了适应性 (逃避) 和不适应性 (寻找药物) 行为.
- 这些发现表明一种可概括的机制,通过这种机制,厌恶会影响行为,超出与药物相关的背景.
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