衝動性眼球運動(サッケード)関連脳波に対する独立成分解析

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We have researched saccade-related EEC to investigate the brain function in saccadic eye movement. In previous studies, we analyzed saccade-related EEC using an ensemble averaging method. However, the ensemble averaging method has some problems. First, EEC signals must be recorded repetitively under the same conditions. In addition, the ensemble averaging method can possibly extinguish EEG signals which have unstable latency between a trigger and the peak point of an EEG signal. Therefore, we applied saccade-related EEG to an independent component analysis (ICA). ICA can extract a signal from mixed signals through the assumption that source signals are mutually independent and recorded signals are mixed lineally from source signals. ICA can analyze non-processed signals. Therefore, ICA overcomes the problems of the ensemble averaging method. In this field, many algorithms were proposed. "Fast ICA with Reference signal (FICAR)" was selected, however, because this algorithm can extract a desired signal close to a reference signal. In this experiment, there were two tasks. The first (eye movement task) was that subjects move their eyes toward a visual target (LED) located on the right and left sides. The second (non-eye movement task) was that subjects do not move their eyes toward the visual target when it is turned on. EEG signals were recorded through electrodes arranged according to the international 10-20 method and were analyzed with the FICAR. Reference signals had one peak and each reference signal had a different peak time. EEG signals were analyzed with each reference signal. As a result, in the case of the eye movement task, the FICAR extracted independent components (ICs) which peaked just before saccade. Few ICs were extracted under the non-eye movement task. The features for peak timing, peak amplitude, and dependence on existence of saccade are the same as the features for the ensemble averaging results. The ICs extraction rate is 71.6% under the eye movement task and 25.2% under the non-eye movement task. The ICs were extracted by reference signals which peak just before saccade. Therefore the ICs are related to saccade-related EEG.
社団法人日本生体医工学会の論文
2003-12-10

衝動性眼球運動(サッケード)関連脳波に対する独立成分解析

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