Phase Analysis of Alpha Rhythm of Magnetoencephalography During Visual Presentation of Affective and Non-Affective Pictures

In this study, we aimed to explore the possibility of evaluating the attitudes of subjects as to whether they liked or disliked visually presented pictures. We measured magnetoencephalgraphic (MEG) responses and conducted a phase analysis of the specific alpha band frequency component. We gave ten subjects a questionnaire with images of animals prepared beforehand. We selected 30 pictures, from which 15 pictures were used as positive impression images (Good Images) and 15 pictures as negative impression images (Bad Images). The MEG responses were measured with a 122-channel magnetometer system. We obtained the power spectrum of MEG responses and carried out a phase analysis of the peak frequency of the alpha band. As a result, significant phase synchronicity was confirmed for the negative impression images.