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Actor-Observer Effect01:23

Actor-Observer Effect

The actor-observer effect, a cognitive bias closely linked to the fundamental attribution error, refers to the tendency for individuals to attribute their behavior to external, situational factors while explaining others’ behavior in terms of internal, dispositional traits. This asymmetry in attribution significantly influences social perception and judgment.Cognitive Mechanisms Behind the EffectTwo primary psychological mechanisms contribute to the actor-observer effect: differences in visual...

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Corticospinal Excitability Modulation During Action Observation
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Motor Recruitment during Action Observation: Effect of Interindividual Differences in Action Strategy.

P M Hilt1, P Cardellicchio1, E Dolfini1

  • 1IIT@UniFe Center for Translational Neurophysiology, Istituto Italiano di Tecnologia, 44121, Ferrara, Italy.

Cerebral Cortex (New York, N.Y. : 1991)
|February 12, 2020
PubMed
Summary

Observing actions doesn't automatically mirror motor commands due to unique movement styles. Instead, corticospinal excitability (CSE) in observers reflects the difference between their own movement patterns and the observed action, highlighting individual motor signatures (IMS).

Keywords:
action observationindividual motor signaturesmultijoint actionstranscranial magnetic stimulationvariability

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Science

Background:

  • Visual processing of actions involves sensorimotor brain activations.
  • Sensorimotor representations can potentially bias visual feature selection.
  • A direct mapping between observed movement and motor commands is often lacking due to individual differences in movement style (individual motor signature - IMS).

Purpose of the Study:

  • To investigate how an observer's individual motor signature (IMS) influences their motor excitability when observing actions performed with different IMSs.
  • To determine if corticospinal excitability (CSE) changes based on the observed action's kinematic and electromyographic patterns.
  • To explore the relationship between actor-observer IMS similarity and observer's motor excitability.

Main Methods:

  • Participants observed an actor performing a multijoint action using two distinct individual motor signatures (IMS).
  • Corticospinal excitability (CSE) was measured in observers during action observation.
  • Kinematic and electromyographic data were analyzed to characterize the observed actions and individual motor signatures.
  • The distance between the actor's and observer's IMS was calculated.

Main Results:

  • No significant group-level modulation of corticospinal excitability (CSE) was found in observers despite kinematic and electromyographic differences in the observed actions.
  • A significant negative correlation was observed between CSE and the actor-observer IMS distance at the single-subject level.
  • This suggests that motor excitability is modulated by the degree of difference between the observer's own motor template and the observed movement.

Conclusions:

  • Sensorimotor activity during action observation is not a direct replication of the actor's motor plan.
  • Motor excitability during action observation is influenced by the perceived difference between the observer's individual motor signature (IMS) and the actor's IMS.
  • The findings highlight the role of internal motor templates in shaping how we process and react to observed actions.