The highs and lows of beta activity in cortico-basal ganglia loops.

The highs and lows of beta activity in cortico-basal ganglia loops.
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DOI:
10.1111/ejn.12574
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发表时间:
2014-06
期刊:
The European journal of neuroscience
影响因子:
--
通讯作者:
Brown P
Brown P
中科院分区:
其他
文献类型:
--
作者:
Brittain JS;Sharott A;Brown P

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β(13-30赫兹)频段的振荡活动广泛存在于皮质-基底节环路中,在帕金森氏病(PD)中表现得尤为突出。在这里,我们提出了这样的假设,即该频段的同步度是跨神经元群体进行门控计算的关键因素,β频段同步的增加会导致信息编码空间的损失,从而导致计算能力的损失。任务和上下文驱动了这种动态门控,因此对于每个状态,都会有一个最佳的网络同步级别,低于或高于此级别都会影响行为性能。因此,在帕金森病中观察到的病理性的同步性夸大,以及脑深部刺激(DBS)等干预措施过度抑制同步性的能力,都可能导致行为表现的损害。事实上,在生理条件下,β活动对计算能力的操纵本身可能存在一种行为选择和维持的机制。
Oscillatory activity in the beta (13–30 Hz) frequency band is widespread in cortico-basal ganglia circuits, and becomes prominent in Parkinson's disease (PD). Here we develop the hypothesis that the degree of synchronization in this frequency band is a critical factor in gating computation across a population of neurons, with increases in beta band synchrony entailing a loss of information-coding space and hence computational capacity. Task and context drive this dynamic gating, so that for each state there will be an optimal level of network synchrony, and levels lower or higher than this will impair behavioural performance. Thus, both the pathological exaggeration of synchrony, as observed in PD, and the ability of interventions like deep brain stimulation (DBS) to excessively suppress synchrony can potentially lead to impairments in behavioural performance. Indeed, under physiological conditions, the manipulation of computational capacity by beta activity may itself present a mechanism of action selection and maintenance.
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