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首页> 外文期刊>Journal of Neurophysiology >Binary mapping of cortical spike trains in short-term memory.
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Binary mapping of cortical spike trains in short-term memory.

机译：短期记忆中的皮质峰值序列的二进制映射。

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摘要

Microelectrode studies in monkeys performing short-term memory tasks show the sustained elevated discharge of cortical neurons during the retention of recalled sensory information. Cortical cells that are part of memory networks are assumed to receive numerous inputs of excitatory as well as inhibitory nature and local as well as remote. Thus it is reasonable to postulate that the temporal and spatial summation of diverse inputs on any cell in an activated network will result in temporally discrete groups of spikes in its firing. The activation of a network in active memory supposedly increases the magnitude and diversity of those inputs and thus increases the discontinuities and frequency fluctuations in the firing of cells in the network. In this study we use a new method of analysis that allows the quantification of firing discontinuities in a spike train. We apply it to parietal cells recorded from monkeys during the performance of a tactile short-term memory task. In our method, time is divided into bins of equal duration and the measure of discontinuities is the total count of the number of transitions between consecutive time bins with and without spikes. The results of the analysis show that in many of the cells studied, discontinuities (transitions between spiking and nonspiking) reflect memory-related activity obscured in the measures of raw spike frequency over a wide range of frequencies. These cells show more firing transitions in active short-term memory than in baseline (intertrial) conditions.
机译：对执行短期记忆任务的猴子进行的微电极研究表明，在保留召回的感觉信息期间，皮质神经元的放电持续升高。假定作为记忆网络一部分的皮层细胞会接受大量的兴奋性，抑制性，局部性和远程性输入。因此，可以合理地假设，在激活的网络中任何小区上，不同输入的时间和空间总和将导致其发射中的尖峰在时间上离散。有源存储器中网络的激活应该增加了这些输入的大小和多样性，因此增加了网络中单元触发的不连续性和频率波动。在这项研究中，我们使用一种新的分析方法，该方法可以量化尖峰脉冲序列中的点火不连续性。我们将其应用于在执行触觉短期记忆任务期间从猴子记录的壁细胞。在我们的方法中，时间被划分为等长的时间段，而不连续性的度量是连续时间段之间有或没有峰值的过渡时间总数。分析结果表明，在许多研究的单元中，不连续性（尖峰和非尖峰之间的过渡）反映了与记忆相关的活动，这些活动在宽频率范围内的原始尖峰频率的测量值中被掩盖了。这些细胞在活跃的短期记忆中比在基线（间质）条件下显示出更多的放电过渡。

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