Role of MSTd extraretinal signals in smooth pursuit adaptation.

Role of MSTd extraretinal signals in smooth pursuit adaptation.
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MSTd 视网膜外信号在平滑追踪适应中的作用。

DOI:
10.1093/cercor/bhr188
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发表时间:
2012
期刊:
Cerebral cortex (New York, N.Y. : 1991)
影响因子:
--
通讯作者:
Mustari,MichaelJ
Mustari,MichaelJ
中科院分区:
--
文献类型:
--
作者:
Ono,Seiji;Mustari,MichaelJ

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平滑寻迹(SP)系统能够适应与开发或系统漂移相关的挑战,以保持寻迹精度。SP的短期适应可以通过实验采用两步速度的阶梯-斜坡跟踪范式(双步范式)来产生。以往的研究表明,猕猴小脑在SP适应中起着至关重要的作用。然而,小脑传入结构中的神经元活动是否显示与SP适应相关的变化仍不确定。因此,我们将重点放在内侧颞上皮层(MSTd)的背内侧部分,该部分是皮质-桥-小脑通路的一部分,被认为提供维持SP所需的视网膜外信号。我们发现54%的SP相关神经元在最初100 ms的反应中表现出显著的变化,与初始追求的适应性变化相关。我们的研究结果表明,MSTd的一些皮层神经元可能在参与SP适应的回路中。此外,我们的MSTd神经元样本平均在SP发作后103 ms开始放电。因此,我们认为MSTd中携带的视网膜外信号可能是由于追逐眼速度信号的复制,这反映了下游运动输出通路(如小脑)的可塑性变化。
The smooth pursuit (SP) system is able to adapt to challenges associated with development or system drift to maintain pursuit accuracy. Short-term adaptation of SP can be produced experimentally using a step-ramp tracking paradigm with 2 steps of velocity (double-step paradigm). Previous studies have demonstrated that the macaque cerebellum plays an essential role in SP adaptation. However, it remains uncertain whether neuronal activity in afferent structures to the cerebellum shows changes associated with SP adaptation. Therefore, we focused on the dorsal–medial part of medial superior temporal cortex (MSTd), which is part of the cortico-ponto-cerebellar pathway thought to provide extraretinal signals needed for maintaining SP. We found that 54% of the SP-related neurons showed significant changes in the first 100 ms of response correlated with adaptive changes of initial pursuit. Our results indicate that some cortical neurons in MSTd could be inside the circuit involved in SP adaptation. Furthermore, our sample of MSTd neurons started their discharge on average 103 ms after SP onset. Therefore, we suggest that extraretinal signals carried in MSTd might be due to efference copy of pursuit eye velocity signals, which reflect plastic changes in the downstream motor output pathways (e.g., the cerebellum).
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DOI: 10.1152/jn.1988.60.2.664
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作者:
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