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Q J Exp Psychol (Hove) ; 70(9): 1808-1823, 2017 Sep.
Article in English | MEDLINE | ID: mdl-27357224

ABSTRACT

Previous studies observed compatibility effects in different interference paradigms such as the Simon and flanker task even when the task was distributed across two co-actors. In both Simon and flanker tasks, performance is improved in compatible trials relative to incompatible trials if one actor works on the task alone as well as if two co-actors share the task. These findings have been taken to indicate that actors automatically co-represent their co-actor's task. However, recent research on the joint Simon and joint flanker effect suggests alternative non-social interpretations. To which degree both joint effects are driven by the same underlying processes is the question of the present study, and it was scrutinized by manipulating the visibility of the co-actor. While the joint Simon effect was not affected by the visibility of the co-actor, the joint flanker effect was reduced when participants did not see their co-actors but knew where the co-actors were seated. These findings provide further evidence for a spatial interpretation of the joint Simon effect. In contrast to recent claims, however, we propose a new explanation of the joint flanker effect that attributes the effect to an impairment in the focusing of spatial attention contingent on the visibility of the co-actor.


Subject(s)
Attention/physiology , Interpersonal Relations , Neuropsychological Tests , Visual Perception/physiology , Adolescent , Adult , Female , Humans , Male , Photic Stimulation , Psychomotor Performance/physiology , Reaction Time/physiology , Social Behavior , Young Adult
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