Encoding and decoding in parietal cortex during sensorimotor decision-making.

Encoding and decoding in parietal cortex during sensorimotor decision-making.
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DOI:
10.1038/nn.3800
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发表时间:
2014-10
影响因子:
25
通讯作者:
Pillow, Jonathan W.
Pillow, Jonathan W.
中科院分区:
医学1区
文献类型:
--
作者:
Park, Il Memming;Meister, Miriam L. R.;Huk, Alexander C.;Pillow, Jonathan W.

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猕猴的外侧顶内区(LIP)在感觉运动决策中起着重要作用。在这里,我们剖析了LIP的神经代码在个人的审判尖峰列车使用的统计方法的基础上广义线性模型。我们表明,LIP反应反映了时间重叠的任务和决策相关信号的组合。我们的模型占LIP尖峰列车的详细统计,并准确地预测尖峰列车从任务事件的单次试验。此外,我们推导出一个最佳的解码器异构,多路复用LIP响应,可以在生物学上合理的电路。在相反的解释LIP作为决策变量提供一个瞬时的代码,我们表明,最佳解码需要集成LIP尖峰在两个时间尺度。这些分析提供了对LIP中神经代码的详细理解,以及研究高级脑区中多路复用信号编码的框架。
The lateral intraparietal area (LIP) of macaques has been asserted to play a fundamental role in sensorimotor decision-making. Here we dissect the neural code in LIP at the level of individual trial spike trains using a statistical approach based on generalized linear models. We show that LIP responses reflect a combination of temporally-overlapping task and decision-related signals. Our model accounts for the detailed statistics of LIP spike trains, and accurately predicts spike trains from task events on single trials. Moreover, we derive an optimal decoder for heterogeneous, multiplexed LIP responses that could be implemented in biologically plausible circuits. In contrast to interpretations of LIP as providing an instantaneous code for decision variables, we show that optimal decoding requires integrating LIP spikes over two timescales. These analyses provide a detailed understanding of the neural code in LIP, and a framework for studying the coding of multiplexed signals in higher brain areas.
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