Poster E24, Monday, March 27, 2:30 – 4:30 pm, Pacific Concourse
Preconscious and conscious stages of stimulus processing depend on whom we are with.
J. Bruno Debruille1,2, Shahin Tavakol1,2, Maud Haffar1,2, Sheila Bouten1, Hugo Pantecouteau3; 1Douglas Institute Research Center, Montreal, Canada, 2McGIll University' Montreal, Canada, 3École Normale Supérieure de Lyon, France
Our immediate reactions to events can depend on which close others are present. The production of behaviors that fit those of well-known others reveals an ability at anticipating their reactions. It shows that we can process stimuli not only from our perspective but also from their perspective. Looking for the mechanisms of this social mode of processing, we found that the mere presence of a close other next to participants has a major impact on their event-related brain potentials (ERPs). These ERPs were evoked by images presented for simple memorization. They largely depended on whether participants were sitting side by side with a close one or with a stranger. Partners had larger N300s and N400s and smaller late posterior positivities than strangers. On the other hand, over the right prefrontal cortex, ERPs differed as early as 100 ms post stimulus onset. Discussion of these results led to suggest that stimulus processing could be initially performed in all learned perspectives. It would then depend on the assumed perspective of the close one present, with fewer aspects of the stimulus eventually reaching consciousness in such a presence.
Topic Area: EMOTION & SOCIAL: Person perception