PROBLEM TO BE SOLVED: To discriminate and remove a systemic hemodynamic signal, a noise signal to show a change similar to an intended brain activity signal.SOLUTION: A waveform of an optical measurement signal at each measuring point of a subjects head to be measured by giving the subject a periodic task or stimulus is once stored in a storage part, separated to be plural separated signal waveforms that are mutually statistically independent by an independent componential analysis method at a separated calculation part, and a correlation function between each of the plural separated signal waveforms and a first model waveform to show a typical brain signal waveform, and a correlation function between each of the plural separated signal waveforms and a second model waveform to show a synchronized noise by a typical systemic hemodynamic signal are calculated, and the brain signal waveform is selected from the plural selected signal waveforms by separating two correlation functions on a two-dimensional plane at a selection part.COPYRIGHT: (C)2013,JPO&INPIT【課題】 目的の脳活動信号と類似した変化を示す雑音信号である全身性血行動態信号とを選別し、除去する。【解決手段】 被験者に周期的なタスクまたは刺激を与えて計測する被検者頭部の各計測点の光計測信号の波形を記憶部に一旦記憶し、、分離演算部で独立成分解析法により相互に統計的独立が成り立つ複数の分離信号波形に分離し、選択部では、その複数の分離信号波形それぞれと、典型的な脳信号波形を表す第1のモデル波形との相関係数、および典型的な全身性血行動態信号による同期雑音を表す第2のモデル波形との相関係数を算出し、2つの相関係数の2次元平面上の区分により複数の分離信号波形のうち脳信号波形を選択する。【選択図】 図5
