情動画像呈示時における視覚誘発定常応答

カテゴリ: 研究会(論文単位)

論文No: MAG12135

グループ名: 【A】基礎・材料・共通部門 マグネティックス研究会

発行日: 2012/11/17

タイトル(英語): Steady-state visually evoked fields associated with affective pictures

著者名: 田中 慶太(東京電機大学),栗城 眞也(東京電機大学),内川 義則(東京電機大学)

著者名(英語): Tanaka Keita(Tokyo Denki University),Kuriki Shinya(Tokyo Denki University),Uchikawa Yoshinori(Tokyo Denki University)

キーワード: 情動|定常的視覚誘発応答|脳磁図|ＩＡＰＳ画像|affective|Steady-state visually evoked fields (SSVEPs)|Magnetoencephalogram (MEG)|International Affective Picture System (IAPS)

要約(日本語): 本研究は、ヒトの情動の定量的評価を目的として、情動画像(IAPS画像)呈示時における脳磁界視覚誘発定常応答（SSVEF）の振幅の変化を検討した。その結果、快画像に比べて、不快画像呈示時におけるSSVEFの振幅が増加を示した。このことからSSVEFの振幅は、情動に関連した反応であることを示唆する。

要約(英語): The aim of this study was to examine the Steady-state visually evoked fields (SSVEFs) associated with the processing of affective images. We used the International Affective Picture System (IAPS) which is increasingly used in brain imaging studies to examine emotional processes. Their images also allow valence to be systematically investigated. Seventy-five IAPS images of positive, neutral and negative valence assessed by subjects prior to the MEG measurement were used. The peripheral square, i.e., frame, of the image was flickered black and white at 15 Hz while the image was kept stationary. We made multi-dipole estimation of the averaged MEG signals and obtained the amplitude of souse waveform in 15Hz component (using a bandpass filter at 14 - 16Hz) of SSVEF in the occipital area. The amplitude of SSVEF in the occipital area was larger in the negative impression images than the positive impression images between 1.0 and 1.5 s after the onset of the stimuli (p<0.05). This result suggests that the amplitude of SSVEF that originated from the surrounding field of visual object was modulated by the emotional object and that the SSVEF could be a measure of emotion of subjects.

原稿種別: 日本語

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