Program Number: PS3A-I154 Presentation Time: Friday, July. 21, 11:00 - 12:00
Reflexive social attention elicited by biological motion in monkeys and humans
Yoshiya Mori1, Mikio Inagaki1, Wu Lisa2, Taijiro Doi1, Eishi Hirasaki1, Hiroo Kumakura1, Ichiro Fujita1
1Osaka Univ, 2Massachusetts Institute of Technology, U.S.A.
Determining where another individual is attending and preparing for his/her upcoming action is crucial for members of a social group. Here we report that the walking direction of another individual elicits a reflexive shift of visuospatial attention in monkeys and humans. We examined how the reaction time to peripheral visual targets was affected by a prior, brief presentation of a walking biological motion (BM) stimulus. During the task, subjects responded to a target point after the disappearance of the BM stimulus and fixation point. The walking direction of the BM stimulus was not predictive of the target direction, and was irrelevant for performing the task. We found that the reaction times in congruent trials, where the walking direction of the BM stimulus and the direction of the target appearance were the same, were significantly shorter than those of incongruent trials. We believe the attention mechanisms driven by BM may be part of the intentionality inference system.
Keywords: REFLEXIVE ATTENTION, BIOLOGICAL MOTION
Reserch Funds: Supported by grants from 17022025 and Takeda Science Foundation