How long is fMRI or NIRS signal delayed?

20 sec read

We know the hemodynamic signal measured by fMRI (or NIRS) is delayed respective to the onset of stimuli. But how long is the delay? Many people think it takes about 2s for the signal to arise. Actually the delay varies from region to region. As shown in this figure, signal in motor cortex (including SMA) arises very quickly (no delay); but the signal in visual cortex arises slow (2s delay).

fmri or nirs signal onset delay

The figure above is adapted from Cui et al, PLoS Biology (2009) Ready…Go: Amplitude of the fMRI Signal Encodes Expectation of Cue Arrival Time

第十一期 fNIRS Journal Club 通知 2020/8/29,10am

北京时间2020年8月29日周六上午10点, 深圳大学成晓君助理教授将为大家讲解她去年发表的一篇用近红外超扫描揭示人际协调的神经机制的文章。同时,她还会和大家介绍如何用Granger causality分析两个信号的因果关系。欢迎大家参加并参与讨论。 她要讲的文献如下: Cheng, Pan, Hu, Hu (2019) Coordination Elicits Synchronous Brain Activity Between Co-actors: Frequency Ratio Matters Frontiers in neuroscience 13() 1071 Abstract: People...
Xu Cui
48 sec read

第十期 fNIRS Journal Club 视频

在2020/7/25日, 北京航空航天大学的汪待发副教授讲解了他发表的一篇BCI文章。视频如下: Youtube:https://youtu.be/gAQQrmbWSOcYouku:https://v.youku.com/v_show/id_XNDc2OTAxNzkzMg==.html
Xu Cui
4 sec read

第十期 fNIRS Journal Club 通知 2020/7/25,10am

北京时间2020年7月25日周六上午10点,北京航空航天大学的汪待发副教授,博士生导师,将为大家讲解他们组去年发表的一篇脑机交互(BCI)的近红外文章。欢迎大家参加并参与讨论。 他要讲的文献如下:Y. Zheng,D. Zhang, L. Wang, Y. Wang, H. Deng, S. Zhang, D. Li, D. Wang, “Resting-State-Based Spatial Filtering for an fNIRS-Based Motor Imagery...
Xu Cui
1 min read

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