At arm's length: competing and complementary mechanisms
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Three experiments utilised video stimuli, showing an agent presenting objects in a behavioural stimulus-response compatibility paradigm, implicitly measuring responses to the agent’s wrist orientation and hand of presentation. A vertical wrist orientation might cue a complementary action response in an ecological setting, thus testing spatial congruence against interactive and imitative responses. In experiment 1, there was a significant main effect of the actor’s arm, (p<.001), responses to the actor’s right arm being faster than to the left arm. There were two significant interactions in experiments 2 and 3, between the actor’s arm and the participants’ hand of response, (p<.001 and p=.05, respectively). Contrary to experiment 1, these interactions are akin to a spatial Simon effect. Possible interpretations of these results are discussed in terms of visual occlusion, kinematics, and affordances, all of which are aspects of spatial negotiation.
Hyne, A. (2013) At arm's length: competing and complementary mechanisms, The Plymouth Student Scientist, 6(1), p. 177-205.