CUDAICA: GPU Optimization of Infomax-ICA EEG Analysis

Figure 3

Comparison between CUDAICA and original code estimated components (ICs): (a, b) first twelve ICs of CUDAICA corresponds to the first twelve ICs, note that the order could be switched and the weights could be inverted (IC4). (c, d) Example of two pairs of components, IC1-IC1 and IC7-IC6, respectively. Both spectra (top-left panels) and eye-movement artifact locked to saccade offset (top-right panels) are indistinguishable by naked eye. We also show an amplified regions where it is possible to appreciate that there are two curves in each plot (bottom panels). Black and red lines: CUDAICA, and grey and magenta lines: Infomax ICA. (e) Average trial-by-trial correlation between pairs of ICs. Almost all rows have a single white spot corresponding to the matched IC calculated by the other implementation, and these spots are not necessarily aligned in the diagonal. Note that there are some subsets of components that do not have the correspondent ICs as these subsets correspond to a subset in other implementation.