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首页> 外文期刊>Journal of Neuroscience Methods >Testing non-linearity and directedness of interactions between neural groups in the macaque inferotemporal cortex.
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Testing non-linearity and directedness of interactions between neural groups in the macaque inferotemporal cortex.

机译：测试猕猴下颞皮层神经群之间相互作用的非线性和方向性。

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摘要

Information processing in the visual cortex depends on complex and context sensitive patterns of interactions between neuronal groups in many different cortical areas. Methods used to date for disentangling this functional connectivity presuppose either linearity or instantaneous interactions, assumptions that are not necessarily valid. In this paper a general framework that encompasses both linear and non-linear modelling of neurophysiological time series data by means of Local Linear Non-linear Autoregressive models (LLNAR) is described. Within this framework a new test for non-linearity of time series and for non-linearity of directedness of neural interactions based on LLNAR is presented. These tests assess the relative goodness of fit of linear versus non-linear models via the bootstrap technique. Additionally, a generalised definition of Granger causality is presented based on LLNAR that is valid for both linear and non-linear systems. Finally, the use of LLNAR for measuring non-linearity and directional influences is illustrated using artificial data, reference data as well as local field potentials (LFPs) from macaque area TE. LFP data is well described by the linear variant of LLNAR. Models of this sort, including lagged values of the preceding 25 to 60 ms, revealed the existence of both uni- and bi-directional influences between recording sites.
机译：视觉皮层中的信息处理取决于许多不同皮层区域中神经元组之间相互作用的复杂和上下文相关的模式。迄今为止，用于解开这种功能连通性的方法都以线性或瞬时相互作用为前提，这些假设不一定有效。在本文中，描述了一个通用框架，该框架包含通过局部线性非线性自回归模型（LLNAR）对神经生理学时间序列数据进行线性和非线性建模。在此框架内，提出了一种新的时间序列非线性和基于LLNAR的神经交互作用指向性非线性测试。这些测试通过自举技术评估线性模型与非线性模型的相对拟合优度。此外，基于LLNAR提出了格兰杰因果关系的广义定义，该定义对线性和非线性系统均有效。最后，通过人工数据，参考数据以及猕猴TE的局部场电势（LFP），说明了LLNAR用于测量非线性和方向性影响的情况。 LFP数据由LLNAR的线性变体很好地描述。此类模型（包括前25到60 ms的滞后值）揭示了记录站点之间存在单向和双向影响。

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