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Functional Near Infrared Spectroscopy (fNIRS): List of manufactures

Contents Company Products Artinis Brite, OxyMon, OctaMon, PortaMon, PortaLite, BIOPAC fNIR 100, fNIR
Xiaodan Feng
11 min read

What does a wavelet coherence plot tell you?

Can you find any pattern in the two signals, green and blue? The blue signal is the brain wave (measured by NIRS) of a person when he is pressing some buttons (the timing of button pressing is shown in the vertical lines); the green signal is also br
Xu Cui
1 min read

Wavelet Coherence

Wavelet transform coherence (WTC) is a method for analyzing the coherence and phase lag between two time series as a function of both time and frequency (Chang and Glover 2010). Here I played with it using the MatLab toolbox provided by Grinsted et a
Xu Cui
1 min read

SVM regression with libsvm

SVM is mostly commonly used for binary classifications. But one branch of SVM, SVM regression or SVR, is able to fit a continuous function to data. This is particularly useful when the predicted variable is continuous. Here I tried some very simple c
Xu Cui
1 min read

SVM (support vector machine) with libsvm

I am learning svm lately and tried libsvm. It’s a good package. Linear kernel example (support vectors are in circles): Nonlinear example (radial basis) 3-class example Basic procedure to use libsvm: Preprocess your data. This including normali
Xu Cui
1 min read

NIRS data analysis (time series)

Also check out NIRS data analysis (GLM and visualization) Environment requirement MatLab SPM xTopo under xjView xjview is located in /fs/fmrihome/fMRItools/Xjview Add xjview to path by addpath(genpath('/fs/fmrihome/fMRItool
Xu Cui
1 min read

NIRS data analysis (GLM and visualization)

Also check out NIRS data analysis (time series) Environment requirement MatLab SPM 5 or 8 xjView 8 xjview can be downloaded for free from https://www.alivelearn.net/xjview/ (If you are inside CIBSR, xjview  is located in /f
Xu Cui
3 min read

AdaBoost, Adaptive boosting

AdaBoost is an algorithm to linearly combine many classifiers and form a much better classifier. It has been widely used in computer vision (e.g. identify faces in a picture or movie). Look at the following example: How it works? First, you have a tr
Xu Cui
51 sec read

xjView, a viewing program for SPM2, SPM5, SPM8 and…

xjView’s official webpage moves to https://www.alivelearn.net/xjview/ xjView is a MatLab program Jian and I wrote a few years ago to display SPM T-test images more easily. Main features include p-value slider: change p-value and display the sup
Xu Cui
33 sec read