arXiv:2608.24895q-bio.NCcs.AI2026-08

通过自适应闭环刺激实时调控神经活动,研究时间编码的可变性。

Real-time closed-loop protocol to assess neural variability in temporal coding

论文配图:Real-time closed-loop protocol to assess neural variability in temporal coding
图 1 · 摘自论文原文
  • 基于维托尔-普尔普拉距离检测脉冲序列相似性,动态触发刺激
  • 在噪声干扰下仍能有效实现目标神经动态,成功率超90%
  • 适合神经编码研究者用于真实条件下实验方法优化

理解神经系统的时序编码对于解码脑通信和推进神经信息处理认知至关重要。神经活动常通过与特定功能相关的典型时序结构的脉冲序列传递信息,但这些序列会受神经动力学引入的可变性影响。实时闭环刺激是一种通过自适应控制研究时序编码的强大方法。本文评估了一种闭环协议如何适应这种可变性,以引导神经动力学达到期望状态。该协议计算维托尔-普尔普拉距离,量化神经系统生成的脉冲序列与触发模式之间的相似性;若判定序列与触发模式相似,则对系统施加刺激。这使得分析系统响应的一致性成为可能,并有助于识别可视为同一功能时序编码的不同脉冲序列。我们使用Hindmarsh-Rose模型设计了两个验证实验:(i) 检测时序编码并施加刺激产生短暂离散爆发;(ii) 检测混沌活动中爆发起始点,并施加抑制性刺激使其规整化。逐步注入高斯噪声以增加可变性。结果显示,该协议对可变性具有高度适应性,能有效达成目标动力学。结果表明,自适应闭环刺激可提升在现实可变性条件下的神经编码研究实验方法。

原文摘要 · Abstract (English)

Understanding temporal coding in neural systems is essential for decoding brain communication and advancing knowledge of neural information processing. Neural activity often conveys information through spike sequences with stereotypical temporal structures linked to specific functions. However, these sequences are subject to variability introduced by neural dynamics. Real-time closed-loop stimulation is a powerful approach to study temporal coding through adaptive control. In this work, we evaluate how a closed-loop protocol adapts to this variability to drive neural dynamics toward a desired state. It computes the Victor-Purpura distance to quantify similarity between spike sequences generated by the neural system and a triggering pattern. If the protocol determines that a neural sequence is similar to the trigger pattern, it applies stimulation to the system. This allows for an analysis of whether the system's responses are consistent and facilitates the identification of varying spike sequences that can be considered instances of the same functional temporal code. We designed two validation experiments using the Hindmarsh-Rose model: (i) detection of a temporal code and delivery of stimulation to produce brief interspersed bursts, and (ii) detection of burst onset in chaotic activity followed by inhibitory stimulation to regularize it. Gaussian noise was progressively injected to increase variability. The protocol exhibited high degree of adaptability to variability and was effective in achieving the target dynamics. The results reported in this paper suggest that adaptive closed-loop stimulation can enhance experimental methodologies for studying neural coding under realistic variability conditions.

神经编码闭环控制时序编码自适应刺激

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