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Interacting hands: the role of attention for the joint Simon effect.

Liepelt R - Front Psychol (2014)

Bottom Line: Experiment 1 provided evidence for a Simon effect.Hand position significantly modulated the size of the Simon effect in the joint Simon task showing an increased Simon effect when the hands of both actors were located near the objects on the monitor, than when they were located away from the monitor.This strengthens the weight of the spatial response codes (referential coding) and hence increases the joint Simon effect.

View Article: PubMed Central - PubMed

Affiliation: Institute for Psychology, University of Muenster Muenster, Germany.

ABSTRACT
Recent research in monkeys and humans has shown that the presence of the hands near an object enhances spatial processing for objects presented near the hand. This study aimed to test the effect of hand position on the joint Simon effect. In Experiment 1, two human co-actors shared a Simon task while placing their response hands either near the objects appearing on the monitor or away from the monitor. Experiment 2 varied each co-actor's hand position independently. Experiment 3 tested whether enhanced spatial processing for objects presented near the hand is obtained when replacing one of the two co-actors by a non-human event-producing rubber hand. Experiment 1 provided evidence for a Simon effect. Hand position significantly modulated the size of the Simon effect in the joint Simon task showing an increased Simon effect when the hands of both actors were located near the objects on the monitor, than when they were located away from the monitor. Experiment 2 replicated this finding showing an increased Simon effect when the actor's hand was located near the objects on the monitor, but only when the co-actor also produced action events in spatial reference. A similar hand position effect was observed in Experiment 3 when a non-human rubber hand replaced the human co-actor. These findings suggest that external action events that are produced in spatial reference bias the distribution of attention to the area near the hand. This strengthens the weight of the spatial response codes (referential coding) and hence increases the joint Simon effect.

No MeSH data available.


Related in: MedlinePlus

Mean RT (in ms) of the joint agent Simon task as a function of rubber hand position (hands monitor, hands chair), own hand position (hands monitor, hands knee) and compatibility (compatible, incompatible) of Experiment 3 (*p < 0.05 indicating the interaction of hand position and compatibility). Error bars depict the SE of the mean.
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Figure 5: Mean RT (in ms) of the joint agent Simon task as a function of rubber hand position (hands monitor, hands chair), own hand position (hands monitor, hands knee) and compatibility (compatible, incompatible) of Experiment 3 (*p < 0.05 indicating the interaction of hand position and compatibility). Error bars depict the SE of the mean.

Mentions: The RT analyses (see Figure 5) showed a significant main effect of compatibility, F(1,30) = 48.88, p < 0.001, partial η2 = 0.62, indicating that responses were overall faster with S–R compatibility (357 ms) than with incompatibility (366 ms), providing evidence for an overall JSE amounting to 9 ms. The co-agent’s hand position, the actor’s own hand position and compatibility interacted significantly, F(1,30) = 4.86, p = 0.035, partial η2 = 0.14. This three-way interaction shows that the compatibility effect was larger in the own hand monitor position (12 ms), than in the own hand knee position (6 ms) when the rubber hand was located on the monitor, F(1,30) = 6.06, p = 0.020, partial η2 = 0.17, but not when the rubber hand was located on the chair (9 ms vs. 9 ms, respectively, F < 1; see Figure 5). The increased JSE for the own hand monitor position when the rubber hand also responded on the monitor was mainly driven by a difference on incompatible trials (p = 0.033, one-tailed). No further main effects or interactions reached statistical significance (all ps > 0.05).


Interacting hands: the role of attention for the joint Simon effect.

Liepelt R - Front Psychol (2014)

Mean RT (in ms) of the joint agent Simon task as a function of rubber hand position (hands monitor, hands chair), own hand position (hands monitor, hands knee) and compatibility (compatible, incompatible) of Experiment 3 (*p < 0.05 indicating the interaction of hand position and compatibility). Error bars depict the SE of the mean.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4269294&req=5

Figure 5: Mean RT (in ms) of the joint agent Simon task as a function of rubber hand position (hands monitor, hands chair), own hand position (hands monitor, hands knee) and compatibility (compatible, incompatible) of Experiment 3 (*p < 0.05 indicating the interaction of hand position and compatibility). Error bars depict the SE of the mean.
Mentions: The RT analyses (see Figure 5) showed a significant main effect of compatibility, F(1,30) = 48.88, p < 0.001, partial η2 = 0.62, indicating that responses were overall faster with S–R compatibility (357 ms) than with incompatibility (366 ms), providing evidence for an overall JSE amounting to 9 ms. The co-agent’s hand position, the actor’s own hand position and compatibility interacted significantly, F(1,30) = 4.86, p = 0.035, partial η2 = 0.14. This three-way interaction shows that the compatibility effect was larger in the own hand monitor position (12 ms), than in the own hand knee position (6 ms) when the rubber hand was located on the monitor, F(1,30) = 6.06, p = 0.020, partial η2 = 0.17, but not when the rubber hand was located on the chair (9 ms vs. 9 ms, respectively, F < 1; see Figure 5). The increased JSE for the own hand monitor position when the rubber hand also responded on the monitor was mainly driven by a difference on incompatible trials (p = 0.033, one-tailed). No further main effects or interactions reached statistical significance (all ps > 0.05).

Bottom Line: Experiment 1 provided evidence for a Simon effect.Hand position significantly modulated the size of the Simon effect in the joint Simon task showing an increased Simon effect when the hands of both actors were located near the objects on the monitor, than when they were located away from the monitor.This strengthens the weight of the spatial response codes (referential coding) and hence increases the joint Simon effect.

View Article: PubMed Central - PubMed

Affiliation: Institute for Psychology, University of Muenster Muenster, Germany.

ABSTRACT
Recent research in monkeys and humans has shown that the presence of the hands near an object enhances spatial processing for objects presented near the hand. This study aimed to test the effect of hand position on the joint Simon effect. In Experiment 1, two human co-actors shared a Simon task while placing their response hands either near the objects appearing on the monitor or away from the monitor. Experiment 2 varied each co-actor's hand position independently. Experiment 3 tested whether enhanced spatial processing for objects presented near the hand is obtained when replacing one of the two co-actors by a non-human event-producing rubber hand. Experiment 1 provided evidence for a Simon effect. Hand position significantly modulated the size of the Simon effect in the joint Simon task showing an increased Simon effect when the hands of both actors were located near the objects on the monitor, than when they were located away from the monitor. Experiment 2 replicated this finding showing an increased Simon effect when the actor's hand was located near the objects on the monitor, but only when the co-actor also produced action events in spatial reference. A similar hand position effect was observed in Experiment 3 when a non-human rubber hand replaced the human co-actor. These findings suggest that external action events that are produced in spatial reference bias the distribution of attention to the area near the hand. This strengthens the weight of the spatial response codes (referential coding) and hence increases the joint Simon effect.

No MeSH data available.


Related in: MedlinePlus