Investigating hemodynamic response variability at the group level using basis functions.

Investigating hemodynamic response variability at the group level using basis functions.
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DOI:
10.1016/j.neuroimage.2009.11.014
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发表时间:
2010-02-01
期刊:
影响因子:
5.7
通讯作者:
Stern, Yaakov
Stern, Yaakov
中科院分区:
医学1区
文献类型:
--
作者:
Steffener, Jason;Tabert, Matthias;Reuben, Aaron;Stern, Yaakov

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介绍的是一个通用的框架,用于执行组水平的分析功能磁共振成像数据使用任何基组的两个功能(即典型的血液动力学响应函数和其一阶导数)来模拟神经活动的血液动力学响应。该方法允许对结果灵活地实施基于生理的限制。来自两个基函数的信息在组水平上使用,并且限制避免了生理上模糊或不可信的结果。这允许研究特定的BOLD活动,例如在指定的时间范围内(即4至5秒)达到峰值的血液动力学反应。所提出的方法的一般性质允许使用专门设计用于研究各种生理现象的基组的应用,即刺激后下冲中与年龄相关的变化,用脑血流成像或受试者特定基组测量的血液动力学反应。以一组健康青年受试者的数据为例,说明了研究刺激后变异性的方法和具体步骤。该方法完全在一般线性模型中实现,并且需要最少的编程计算。
Introduced is a general framework for performing group level analyses of fMRI data using any basis set of two functions (i.e. the canonical hemodynamic response function and its first derivative) to model the hemodynamic response to neural activity. The approach allows for flexible implementation of physiologically based restrictions on the results. Information from both basis functions is used at the group level and the limitations avoid physiologically ambiguous or implausible results. This allows for investigation of specific BOLD activity such as hemodynamic responses peaking within a specified temporal range (i.e. 4 to 5 seconds). The general nature of the presented approach allows for applications using basis sets specifically designed to investigate various physiologic phenomena, i.e. age-related variability in post-stimulus undershoot, hemodynamic responses measured with cerebral blood flow imaging or subject specific basis sets. An example using data from a group of healthy young participants demonstrates the methods and the specific steps to study post-stimulus variability are discussed. The approach is completely implemented within the general linear model and requires minimal programmatic calculations.
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