Thalamic Inhibition: Diverse Sources, Diverse Scales.

Thalamic Inhibition: Diverse Sources, Diverse Scales.
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DOI:
10.1016/j.tins.2016.08.001
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发表时间:
2016-10
影响因子:
15.9
通讯作者:
Acsády L
Acsády L
中科院分区:
医学1区
文献类型:
--
作者:
Halassa MM;Acsády L

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丘脑是形成感觉、行动和认知的皮层输入的主要来源。丘脑回路是两个主要的抑制系统的目标:丘脑网状核(TRN)和丘脑外抑制(ETI)输入。目前还缺乏关于这些系统如何运作的统一框架。在这里,我们提出TRN回路在不同的时空尺度上专门施加丘脑控制。在注意选择过程中,丘脑尖峰率的局部抑制普遍存在,而在睡眠过程中,丘脑尖峰率的整体抑制更有可能出现。相比之下,ETI(起源于基底节区、交错带、前顶盖和脑桥网状结构)提供了时间上精确和局部的抑制,影响了峰值时间。总之,这些抑制系统允许对丘脑输出进行分级控制,使丘脑皮层的操作能够动态地匹配正在进行的行为需求。
The thalamus is the major source of cortical inputs shaping sensation, action and cognition. Thalamic circuits are targeted by two major inhibitory systems: the thalamic reticular nucleus (TRN) and extra-thalamic inhibitory (ETI) inputs. A unifying framework of how these systems operate is currently lacking. Here, we propose that TRN circuits are specialized to exert thalamic control at different spatiotemporal scales. Local inhibition of thalamic spike rates prevails during attentional selection whereas global inhibition more likely during sleep. In contrast, the ETI (arising from basal ganglia, zona incerta, anterior pretectum and pontine reticular formation) provides temporally-precise and focal inhibition, impacting spike timing. Together, these inhibitory systems allow graded control of thalamic output, enabling thalamocortical operations to dynamically match ongoing behavioral demands.
单个海马GABA能突触的突触后反应的释放概率依赖性尺度。
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