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
Assume you have a vector (x,y,z) and you want to rotate it to, say x-axis, you can multiply the rotation matrix to the vector. First, make the vector a column vector and append 1 to the end. It becomes a 4×1 matrix: v = x y z 1 Then, convert the
Several years ago in San Diego I was in a friend’s car when he hit the car in front. The accident was mild and nobody was injured. After the two cars pulled over, I was wondering what the other driver would say. He said, “I am sorry to me
I saw at least two web pages saying that the reference slice can be chosen during slice timing correction. For example, http://www.fil.ion.ucl.ac.uk/spm/doc/manual/spatial.htm. I disagree. Let’s take the first volume as example. Assume TR=2 and
The mostly used functions I use in SPM is spm_get (for spm2) and spm_select (spm5 and 8). These two functions are used to get files (usually image files). Frankly speaking I like spm_get much better as it’s intuitive and easy to use. Here is h
My gmail inbox has 12,000 emails. I receive ~30 emails (after removing junk mails) each day. Though I have set to display 100 emails per page but some important but unreplied emails soon disappear from the first page. I often “star” impor
Text source: http://imaging.mrc-cbu.cam.ac.uk/imaging/MniTalairach Talairach brain (single) the brain dissected and photographed for the famous Talairach and Tournoux atlas. The atlas has Brodmann’s areas labelled, albeit in a rather approximat
