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 i
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
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 varia
Update 2021/2/27: If you find griddata3 not working, try to change griddata3 to griddata. I was asked where to get nirs2img script. Here it is. The download link is at the bottom of this article. nirs2img is to create an image file from the input data. Then theimage file can be viewed by a
When I was a graduate student at Baylor College of Medicine, I found myself often in an embarrassing situation — I felt completely lost when my fellow graduate students heatedly discussed a paper in our field but I never heard of this publicati
When I was a graduate student in Baylor College of Medicine I participated in an “exercise and brain” study in our lab as a subject, and got my brain scanned every week for about 10 weeks. I thought it was crazy; but apparently it’s
I have a friend who has been using fMRI for more than 10 years and now a professor. He heard NIRS might be a good technology to measure human brain but knew little about it. So what is the difference between NIRS and fMRI? This is probably a common q
In concurrent NIRS-MRI experiments, you often need to know exactly where the NIRS probes are in the MRI iamges. In this case, a fiducial marker becomes important. In our 2011 publication titled “A quantitative comparison of NIRS and fMRI across
xjView 8.14 just released. Download link: https://www.alivelearn.net/xjview xjView 8.13 is released with the following new features: Allow to change the minimum value of the color bar range. This will enable you to do Create a symmetric color bar fro
NIRS hyperscanning data analysis (1) NIRS hyperscanning data analysis (2) NIRS hyperscanning data analysis (3) NIRS hyperscanning data analysis (4) How do we analyze hyperscanning data to find out the relationship between two brains? Obviously correl
Back in 2009 we published a paper titled “Functional near infrared spectroscopy (NIRS) signal improvement based on negative correlation between oxygenated and deoxygenated hemoglobin dynamics“. In a nutshell, we found the oxy- and deoxy-H
Assume you are doing a correlation study between two brain areas, A and B. For each subject, you get a single value, the correlation between A and B. And you have 100 subjects. How do you know if the mean of the correlation is significantly different
