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The conditioned eyeblink response: a role for the GABA-B receptor?

机译:条件性眨眼反应:GABA-B受体的作用?

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In well-trained animals, infusion of the GABA-B agonist baclofen into the cerebellar interpositus nucleus and overlying cortex abolished the conditioned response (CR) with no effect on the unconditioned response (UR) with doses at or above 5.0 mM. Infusion of the GABA-B antagonist CGP 5584-5A alone had no effect on the CR or UR. However, administration of 5 mM baclofen soon after infusion of CGP 5584-5A (15 min) resulted in no reduction of percent CR and only partial reduction of CR amplitude. Naive animals given interpositus infusions of baclofen during training showed no learning, yet learned normally in postinfusion training. The distribution of (radiolabelled) baclofen was localized and remained within the cerebellum. The results presented here are consistent with a growing body of literature supporting the hypothesis that the memory trace for eyeblink conditioning is formed and stored in the cerebellum and may involve GABAergic mechanisms.
机译:在训练有素的动物中,将GABA-B激动剂巴氯芬注入小脑中间核和上皮中可消除条件性反应(CR),而剂量等于或大于5.0 mM时对条件性反应(UR)无影响。单独输注GABA-B拮抗剂CGP 5584-5A对CR或UR没有影响。但是,在输注CGP 5584-5A后(15分钟)立即施用5 mM巴氯芬可导致CR百分比未降低,而CR振幅仅部分降低。在训练过程中接受巴氯芬的房间输注的幼稚动物没有学习,但在输注后训练中仍能正常学习。 (放射状)巴氯芬的分布是局部的,并保留在小脑内。本文提供的结果与越来越多的文献相符,该文献支持以下假设:眨眼条件形成的记忆轨迹形成并存储在小脑中,并且可能涉及GABA能机制。

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