Bayesian technique for investigating linearity in event-related BOLD fMRI

被引:10
作者
Kershaw, J
Kashikura, K
Zhang, XJ
Abe, S
Kanno, I
机构
[1] Res Inst Brain & Blood Vessels, Dept Radiol & Nucl Med, Akita 010874, Japan
[2] Japan Sci & Technol Corp, JST, Akita Lab, Akita, Japan
关键词
brain; event-related BOLD fMRI; Bayesian analysis; linear hemodynamic response function; poststimulus undershoot;
D O I
10.1002/mrm.1143
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Event-related BOLD fMRI data is modeled as a linear time-invariant system. Together with Bayesian inference techniques, a statistical test is developed for rigorously detecting linearity/ nonlinearity in the BOLD response system. The test is applied to data collected from eight subjects using an event-related paradigm with a switching checkerboard as the visual stimulus. Analyzed as a group, the results clearly find the response to be nonlinear. When each subject is analyzed individually, however, the results are predominantly nonlinear, but there is some evidence to suggest that there may be a crossover from a linear to a nonlinear regime and vice versa, This could be important when estimating physiological parameters for individuals. Additionally, estimates of the hemodynamic response function and corresponding response were obtained, but there was no consistent appearance of a poststimulus undershoot in the event-related BOLD response. (C) 2001 Wiley-Liss, Inc.
引用
收藏
页码:1081 / 1094
页数:14
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