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Mismatch negativity and P50 sensory gating in abstinent former cannabis users

机译:禁酒前大麻使用者的负匹配负性和P50感觉门控

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摘要

Prolonged heavy exposure to cannabis is associated with impaired cognition and brain functional and structural alterations. We recently reported attenuated mismatch negativity (MMN) and altered P50 sensory gating in chronic cannabis users. This study investigated the extent of brain functional recovery (indexed by MMN and P50) in chronic users after cessation of use. Eighteen ex-users (median 13.5 years prior regular use; median 3.5 years abstinence) and 18 nonusers completed (1) a multifeature oddball task with duration, frequency, and intensity deviants and (2) a P50 paired-click paradigm. Trend level smaller duration MMN amplitude and larger P50 ratios (indicative of poorer sensory gating) were observed in ex-users compared to controls. Poorer P50 gating correlated with prior duration of cannabis use. Duration of abstinence was positively correlated with duration MMN amplitude, even after controlling for age and duration of cannabis use. Impaired sensory gating and attenuated MMN amplitude tended to persist in ex-users after prolonged cessation of use, suggesting a lack of full recovery. An association with prolonged duration of prior cannabis use may indicate persistent cannabis-related alterations to P50 sensory gating. Greater reductions in MMN amplitude with increasing abstinence (positive correlation) may be related to either self-medication or an accelerated aging process.
机译:长时间大量暴露于大麻与认知能力下降以及脑功能和结构改变有关。我们最近报道了慢性大麻使用者中的不匹配阴性(MMN)减弱和P50感觉门控改变。这项研究调查了慢性使用者停止使用后脑功能恢复的程度(由MMN和P50指数)。 18位前用户(中位数为13.5年;常规使用中位时间为3.5年)和18位非用户(1)完成了具有持续时间,频率和强度偏差的多功能奇异球任务,以及(2)P50配对点击范例。与对照组相比,在前用户中观察到趋势水平较小的持续时间MMN幅度和较大的P50比(表明感觉门控较差)。 P50门控不良与大麻使用的先前时间有关。即使控制了年龄和使用大麻的时间,禁酒的时间也与MMN的持续时间呈正相关。长期停止使用后,前使用者的感觉门控受损和MMN幅度减弱往往会持续存在,这表明缺乏充分的恢复能力。与先前使用大麻时间延长的关联可能表明,与大麻有关的持久性改变与P50感觉门控有关。随着禁欲(正相关)的增加,MMN幅度的更大降低可能与自我服药或加速衰老过程有关。

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