第66回心理学研究室セミナー（Mariano D´Angelo先生）

文学部心理学研究室では、第66回心理学研究室セミナーとして以下のような講演会を開催しますので、ふるってご参加ください。なお、講演内容は大学院生以上を想定しております。講演は英語で行われます。

第66回心理学研究室セミナー
日時：2024年6月28日（金）午後5時から

場所：文学部3番大教室（国際学術総合研究棟1階）

【講師】　Mariano D´Angelo 先生 (Karolinska Institutet）

【演題】　Binding the Self: Alpha oscillations bind visuo-tactile information to generate the sense of body ownership.

【要旨】A highly debated proposal in cognitive neuroscience concerns the role of alpha oscillations in sampling external multisensory signals and shaping the width of the temporal binding window (TBW) - the temporal interval in which different stimuli integrate into a unified percept. Faster oscillations in the alpha band result in more frequent perceptual frame and a narrower TBW, while slower oscillations yield fewer perceptual units and a wider TBW. However, it remains unknown if alpha frequency also integrates bodily sensory information to generate the sense of body ownership, i.e., the experience of one’s own body as one’s own. Here, I’ll show that the temporal resolution of multisensory perception correlates with the temporal resolution of multisensory integration involved in body ownership (Exp 1). I’ll argue that this happens because alpha frequency integrates visuo-tactile stimuli to generate the sense of a unified bodily self, using both correlational (Exp 2) and causal (Exp 3) approaches.
In all Experiments, participants performed (i) simultaneity judgments, evaluating the perceived synchronicity of visual and tactile stimuli presented at varying delays, and (ii) body ownership judgments, experiencing illusory sense of owning a rubber hand (i.e., the rubber hand illusion). Two robots touched a rubber and the participant’s hands, synchronously or delayed. Participants indicated if they perceived the rubber hand as their own or not. In Exp 2 EEG was recorded, while in Exp 3 transcranial alternating current stimulation (tACS) modulated oscillations at low or high alpha, with a non-stimulation condition. Exp 1 showed that participants with larger TBW, and lower sensitivity, in the simultaneity judgments also displayed a larger TBW, and lower sensitivity, in body ownership judgments. Exp 2 revealed that participants’ individual alpha frequency in the posterior parietal cortex correlates with TBWs and sensitivity in both the body ownership and simultaneity judgments. Moreover, alpha peak frequency slowed down during body ownership judgments as compared to simultaneity judgments. Finally, Exp 3 showed that tACS modulated the TBW and the sensitivity in both simultaneity and body ownership judgments: low alpha-tACS enlarged the TBW and reduced the sensitivity, while high alpha-tACS reduced the TBW and increased the sensitivity.
  In conclusion, temporal resolution of multisensory integration for external events correlates with multisensory integration involved in body ownership. This is because alpha oscillations integrate sensory stimuli to generate the sense of body ownership, just like alpha oscillations support multisensory integration for external events. In addition, the alpha peak speeds up during simultaneity judgments and slows down during body ownership judgments, suggesting that alpha frequency integrates multisensory information based on the specific task demand.


（問い合わせ先）心理学研究室　shinri -at- L.u-tokyo.ac.jp  （-at-を@に変更）