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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Integration of direction cues is invariant to the temporal gap between them
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Integration of direction cues is invariant to the temporal gap between them

机译：方向提示的整合不变于它们之间的时间间隙

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摘要

Many decisions involve integration of evidence conferred by discrete cues over time. However, the neural mechanism of this integration is poorly understood. Several decision-making models suggest that integration of evidence is implemented by a dynamic system whose state evolves toward a stable point representing the decision outcome. The internal dynamics of such point attractor models render them sensitive to the temporal gaps between cues because their internal forces push the state forward once it is dislodged from the initial stable point. We asked whether human subjects are as sensitive to such temporal gaps. Subjects reported the net direction of stochastic random dot motion, which was presented in one or two brief observation windows (pulses). Pulse strength and interpulse interval varied randomly from trial to trial. We found that subjects' performance was largely invariant to the interpulse intervals up to at least 1 s. The findings question the implementation of the integration process via mechanisms that rely on autonomous changes of network state. The mechanism should be capable of freezing the state of the network at a variety of firing rate levels during temporal gaps between the cues, compatible with a line of stable attractor states.
机译：许多决定涉及随着时间的推移整合离散线索赋予的证据。然而，这种整合的神经机制理解得很差。一些决策模型表明证据的整合由动态系统实施，其状态发展朝向代表决策结果的稳定点。这种点吸引物模型的内部动态使它们敏感于提示之间的时间间隙，因为它们的内部力一旦从初始稳定点移位就会向前推动状态。我们询问人类受试者是否对这种时间差距敏感。主题报告了随机随机点运动的净方向，该方向于一个或两个简短的观察窗口（脉冲）。脉冲强度和眼眶间隔随机变化，从试验中随机变化。我们发现受试者的表现在很大程度上不变于间隔时间至少为1秒。调查结果质疑通过依赖网络状态自主变化的机制实现集成过程。该机制应该能够在提示之间的时间间隙期间在各种射击率水平下冻结网络的状态，与稳定的吸引子状态兼容。

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