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Sensory attenuation for jointly produced action effects.

Janeen D Loehr¹

¹Department of Psychology, University of Saskatchewan Saskatoon, SK, Canada.

Frontiers in Psychology

|April 19, 2013

Summary

People can distinguish their own actions from others during joint action. Sensory attenuation, a reduced brain response to self-generated stimuli, is weaker in joint actions, especially with timing delays.

Keywords:

auditory N1 event-related potential joint action self-other distinction sensory attenuation social context

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Area of Science:

Cognitive Neuroscience
Social Psychology
Human-Computer Interaction

Background:

Successful joint action relies on distinguishing individual contributions.
Sensory attenuation, a reduction in sensory processing for self-generated events, is a proposed mechanism for self-other distinction.
Previous research demonstrated reduced auditory N1 event-related potentials (ERPs) for self-generated versus externally generated tones.

Purpose of the Study:

To investigate sensory attenuation during jointly generated actions.
To determine if the N1 ERP response is attenuated for tones produced by coordinated action between two individuals.
To explore the impact of action synchrony and delays on sensory attenuation in joint tasks.

Main Methods:

Measured electroencephalography (EEG) to record event-related potentials (ERPs).
Compared N1 ERP responses for self-generated tones versus jointly generated tones.
Manipulated the timing of button presses between participants and the onset of the auditory stimulus in the joint action condition.

Main Results:

Auditory N1 ERP attenuation was significantly smaller for jointly generated tones compared to self-generated tones.
In joint actions, increased delays between partners' button presses correlated with reduced N1 attenuation.
N1 attenuation was observed only when there was no temporal delay between a participant's action and tone onset in joint trials.

Conclusions:

Individuals differentiate their own contributions from a partner's at a sensorimotor level during joint action.
The degree of sensory attenuation in joint action is sensitive to the temporal coordination between collaborators.
These findings highlight the neural mechanisms underlying self-other distinction in shared intentionality and coordinated behavior.