The others were easy to create compared to this one. It took me a week to write the code and the Stardent 2 weeks to calculate the values. I wrote the algorithm to calculate the correlation dimension, similar to the fractal dimension, which is a measure of the complexity of a system, or more generally, a measure of how a system fills a space, real or abstract. The rest was simple. The data consists of one minute of EEG, the first 30 seconds the subjects eyes were open, then they shut their eyes for the remaining 30 seconds.
Time goes from left to right.
As usual, the visual cortex corresponds to the lower half of the volume, which is where one would expect to see the most significant change when the eyes are closed, and this is in fact quite distinct.