June 2012

Indipendent Component Analysis and non stationarity

Submitted by Giuseppe on Mon, 06/11/2012 - 10:56

Hi all, I'm just registered at this forum.
I'm studying Indipendent Component Analysis. I noted that it works only with time stationary processes, and fail in presence of non time stationary ones (exponential ramp, linear ramp, etc.). Are there other non-parametric techniques of blind source separation that work in in these cases? I found only parametric methods until now.

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Other

multi-label images 能在一个MASK里定义的ROI有上限吧？

Submitted by yubing on Sat, 06/09/2012 - 21:40

‘我今天用 AAL .nii  作为 REST 中“ multi-label images in one mask'" 的 mask 文件，以提取AAL脑区的时间序列
但是出错了，似乎是由于 定义的ROI 数超过了 软件的限制，具体出错信息附后。麻烦指教，多谢！

REST 1.7， Matlab 2011b， WINDOWS XP 

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Resting-state fMRI topics

AAL_116或90 功能连接

Submitted by wleewell on Fri, 06/01/2012 - 10:43
经常看到基于AAL-116或90模板分区做全脑功能连接的文献，相关操作问题想请教下老师们。
 
1、 首先要算出这些区域两两之间的相关值，在DPARSF中做是否合适？
2、 DPARSF得出那么多z值后，进行单样本及双样本t检验，可能可以在SPSS下做，但是否在Matlab下做是否更简单呢，相关程序是否可以教一下呢，或者还有其他办法吗？
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Resting-state fMRI topics