Evaluation of the effectiveness of DSSP in brain function examination

Abstract

It has been reported that frequency analysis results (MF: mean frequency, etc.) of spontaneous magnetoencephalographic(MEG) activity are useful as one of the indexes for diagnosing brain functions such as dementia. They need to be stable so that the same results can be obtained in different situations. However, the results are easily distorted by interference signals. Therefore, in this study, we applied the DSSP(Dual Signal Subspace Projection) method to the spontaneous brain activity data recorded under various conditions with MEG, and investigated its effect. The MF value was improved by performing DSSP on the data containing the interference signal. It was confirmed that even if DSSP was applied to clean data, there was almost no change in the MF value compared to the case without DSSP, and the frequency spectrum of the alpha-wave band did not change. It was suggested that the disadvantages of applying DSSP are extremely small.