Neural circuit dynamics underlying accumulation of time-varying evidence during perceptual decision making.

Neural circuit dynamics underlying accumulation of time-varying evidence during perceptual decision making.
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在感知决策过程中,随着时间变化的证据积累的基础神经电路动力学。

DOI:
10.3389/neuro.10.006.2007
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发表时间:
2007
影响因子:
3.2
通讯作者:
Wang, Xiao-Jing
Wang, Xiao-Jing
中科院分区:
医学4区
文献类型:
--
作者:
Wong, Kong-Fatt;Huk, Alexander C.;Shadlen, Michael N.;Wang, Xiao-Jing

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决策回路中的神经元如何整合随时间变化的、支持或反对不同选择选项的信号呢?为了解决这个问题,我们使用了一个循环神经网络模型来模拟一个实验,在该实验中猴子对视觉运动刺激执行方向辨别任务。在最近的一项研究中发现,短暂的运动脉冲会干扰外侧顶内区(LIP)的神经活动,并对猴子的选择和反应时间产生相应的影响。我们的模型重现了行为观察结果,并复制了LIP的活动,根据脉冲方向与偏好的运动刺激方向相同还是相反,这种活动会在几百毫秒内持续增加或减少。此外,我们的模型解释了这样一个观察结果:当脉冲相对于运动刺激开始较晚时,它对LIP神经元反应的影响较弱。我们表明这种对时移不变性(TSI)的违反与一种时间整合的循环回路机制是一致的。我们进一步使用两个相同或相反运动方向的连续脉冲来研究时间整合。所引起的行为表现变化不是累加的,并且成对脉冲中的第二个脉冲比其单独作用的效果要小,这是一个可通过实验验证的预测。综上所述,这些发现为知觉决策中时间整合的吸引子网络模型提供了进一步的支持。
How do neurons in a decision circuit integrate time-varying signals, in favor of or against alternative choice options? To address this question, we used a recurrent neural circuit model to simulate an experiment in which monkeys performed a direction-discrimination task on a visual motion stimulus. In a recent study, it was found that brief pulses of motion perturbed neural activity in the lateral intraparietal area (LIP), and exerted corresponding effects on the monkey's choices and response times. Our model reproduces the behavioral observations and replicates LIP activity which, depending on whether the direction of the pulse is the same or opposite to that of a preferred motion stimulus, increases or decreases persistently over a few hundred milliseconds. Furthermore, our model accounts for the observation that the pulse exerts a weaker influence on LIP neuronal responses when the pulse is late relative to motion stimulus onset. We show that this violation of time-shift invariance (TSI) is consistent with a recurrent circuit mechanism of time integration. We further examine time integration using two consecutive pulses of the same or opposite motion directions. The induced changes in the performance are not additive, and the second of the paired pulses is less effective than its standalone impact, a prediction that is experimentally testable. Taken together, these findings lend further support for an attractor network model of time integration in perceptual decision making.
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发表时间: 1990-09-01
期刊: NEURON
影响因子: 16.2
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