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Related Experiment Videos

Motor awareness without perceptual awareness.

Helen Johnson1, Patrick Haggard

  • 1Institute of Cognitive Neuroscience and Department of Psychology, University College London, Alexandra House, 17 Queen Square, London WC1N 3AR, UK.

Neuropsychologia
|February 15, 2005
PubMed
Summary

Action control can be automatic, occurring without conscious awareness. This study introduces a new measure of motor awareness, showing it

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Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Consciousness Studies

Background:

  • Action control is often described as automatic, with movement control occurring independently of conscious awareness.
  • Previous research on rapid visuomotor adjustments has highlighted distinctions between motor performance and perceptual awareness.
  • Existing studies may have conflated motoric/perceptual representations with conscious/unconscious processes.

Purpose of the Study:

  • To propose and validate a new measure of motor awareness.
  • To investigate the dissociation between motor awareness and perceptual awareness during visuomotor adjustments.
  • To explore the neural underpinnings of motor awareness, particularly concerning the parietal cortex.

Main Methods:

  • Developed a novel measure of motor awareness based on reproducing spatial details of executed movements.
  • Conducted experiments involving rapid visuomotor adjustments to reaching movements after a target shift.
  • Utilized transcranial magnetic stimulation (TMS) over the parietal cortex in a second experiment.

Main Results:

  • Demonstrated a dissociation between motor awareness and perceptual awareness of a target shift during reaching.
  • Participant's ability to reproduce movement endpoints was independent of their visual perception of the target shift.
  • Neither motor awareness nor motor performance were significantly disrupted by TMS over the parietal cortex.

Conclusions:

  • Motor awareness can be dissociated from perceptual awareness in visuomotor tasks.
  • The findings challenge traditional views of automatic action control and consciousness.
  • Suggests distinct neural mechanisms for motor awareness, with potential implications for theories of consciousness.

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