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Self-touch affects motor imagery: a study on posture interference effect.

Massimiliano Conson1, Elisabetta Mazzarella, Luigi Trojano

  • 1Neuropsychology Laboratory, Department of Psychology, Second University of Naples, via Vivaldi 43, 81100, Caserta, Italy. massimiliano.conson@unina2.it

Experimental Brain Research
|September 28, 2011
PubMed
Summary
This summary is machine-generated.

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Self-touch combined with proprioception significantly hinders motor imagery in right-handers, especially with dominant arm involvement. This interaction highlights the body schema

Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Body Schema Research

Background:

  • Previous research indicates posture manipulation interferes with mental body part rotation.
  • Prior studies often combined proprioceptive and self-tactile information, making it difficult to isolate their effects.
  • The precise role of self-touch versus proprioception in motor imagery interference remains unclear.

Purpose of the Study:

  • To test if the combination of self-touch and proprioception is more disruptive to motor imagery than proprioception alone.
  • To investigate the influence of hand dominance on the interaction between sensory information and motor imagery.
  • To clarify the contribution of self-tactile feedback in posture-related motor imagery interference.

Main Methods:

  • Experiment 1: Participants performed a hand laterality task under three conditions: self-touch (arm flexed against chest), no self-touch (hand on smooth surface), and neutral posture.

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  • Sensory manipulations were applied to the right or left arm.
  • Experiment 2: Confirmed results were not due to inter-manual conflict by applying manipulations to both arms simultaneously.

    • Main Results:

    • Right-handers were significantly slower in the hand laterality task during the self-touch condition compared to the other two conditions.
    • This slowing effect was more pronounced when the dominant arm was involved in the self-touch manipulation.
    • No significant posture-related effects on task performance were observed in left-handers.

    Conclusions:

    • The findings reveal a complex interplay between body schema and motor imagery.
    • Self-touch, in conjunction with proprioception, demonstrably interferes with motor imagery, particularly in right-handers.
    • Hand dominance plays a crucial role in modulating the relationship between sensory feedback and motor imagery processes.