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Related Experiment Video

Updated: May 14, 2026

Observing the Transformation of Bodily Self-consciousness in the Squeeze-machine Experiment

Observing the Transformation of Bodily Self-consciousness in the Squeeze-machine Experiment

Published on: March 8, 2019

Joint Simon effects in extrapersonal space.

Timothy N Welsh¹, Dovin Kiernan, Heather F Neyedli

¹Faculty of Kinesiology and Physical Education, University of Toronto, Ontario, Canada. t.welsh@utoronto.ca

Journal of Motor Behavior

|February 8, 2013

Summary

This summary is machine-generated.

The joint Simon effect (JSE), where response times are faster when stimuli appear in front of partners, was re-examined. This study failed to replicate a previous null finding, suggesting co-representation is key to the JSE.

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Last Updated: May 14, 2026

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Area of Science:

Cognitive Psychology
Social Cognition
Human-Computer Interaction

Background:

The joint Simon effect (JSE) demonstrates faster response times when individuals performing separate parts of a task have stimuli presented in front of them.
The action co-representation account suggests JSE arises from shared representation of responses and associated compatibility processes.
A previous study by Guagnano et al. (2010) challenged this account by finding no JSE when participants were outside each other's peripersonal space.

Purpose of the Study:

To re-evaluate the arguments presented by Guagnano et al. (2010) regarding the action co-representation account of the JSE.
To investigate whether the null JSE finding in Guagnano et al. (2010) can be replicated.
To determine the robustness of the action co-representation account in explaining the JSE.

Main Methods:

A study was conducted to replicate the experimental conditions of Guagnano et al. (2010), involving participants performing a modified Simon task.
Participants were positioned such that their spatial relationship was varied to assess the influence on the JSE.
Response times and accuracy were measured under different spatial configurations.

Main Results:

The current study failed to replicate the null finding of Guagnano et al. (2010), observing a significant JSE.
The results indicate that the spatial arrangement of participants, specifically being outside peripersonal space, did not eliminate the JSE in this replication attempt.
The observed JSE supports the notion of shared response representations even in conditions designed to increase task independence.

Conclusions:

The null effect reported by Guagnano et al. (2010) may be an anomaly within the broader JSE literature.
The action co-representation account remains a strong and viable explanation for the underlying mechanisms of the joint Simon effect.
Further research is warranted to fully understand the boundary conditions and nuances of the JSE and co-representation.