Assessing the allocation of attention to audiovisual experience with the P300 elicited by vibratory probe stimuli

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  • SHIGEMITSU Yumi
    Graduate School of Integrated Arts and Sciences Hiroshima University
  • NITTONO Hiroshi
    Graduate School of Integrated Arts and Sciences Hiroshima University
  • HORI Tadao
    Graduate School of Integrated Arts and Sciences Hiroshima University

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Other Title
  • 振動プローブ刺激に対するP300を指標とした視聴覚体験に対する注意配分の検討
  • シンドウ プローブ シゲキ ニ タイスル P300 オ シヒョウ ト シタ シチョウカク タイケン ニ タイスル チュウイ ハイブン ノ ケントウ

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This study examined whether a participant's level of attention to video clips could be assessed by event-related brain potentials to vibratory probe stimuli. Twelve university students performed a somatosensory target detection task while watching silent video clips (video alone condition) or video clips with sound tracks (video + sound condition). The somatosensory stimuli consisted of standard (middle finger, p =.70), target (little finger, p =.15), and nontarget (thumb, p =.15) vibratory stimuli. All the probe stimuli were presented either on the left or on the right hand. The task involved buttonpress responses to target stimuli using the other hand. Both the target and nontarget stimuli elicited a P300 wave, the amplitude of which was smaller while participants were viewing video clips than while viewing still images (picture condition). The amplitude of the nontarget P300 was further reduced by adding sound tracks to the video clips. The eventrelated potentials to somatosensory probe stimuli may be a useful objective index of how strongly an audiovisual experience attracts a viewer's attention. (Japanese Journal of Physiological Psychology and Psychophysiology, 25 (3) : 277-285, 2007.)

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