Movement Intention After Parietal Cortex Stimulation in Humans

  title={Movement Intention After Parietal Cortex Stimulation in Humans},
  author={Michel Desmurget and Karen T. Reilly and Nathalie Richard and Alexandru Szathm{\'a}ri and Carmine Mottolese and Angela Sirigu},
  pages={811 - 813}
Consciousness and Intention Where in the brain are our intentions formed and how do we become aware of these intentions? Desmurget et al. (p. 811; see the Perspective by Haggard) investigated the effect of direct cortical stimulation of parietal and premotor regions in patients undergoing brain surgery for tumor removal. Stimulation of the parietal lobe provoked the conscious experience of wanting to move the upper limb, lips, or tongue without any concomitant motor activity. When stimulation… 
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A temporally extended brain process underlying conscious movement intention is revealed that spans seconds around movement commencement, and a computational model using coupled leaky integrator units with biophysically plausible assumptions about the effect of tDCS captured the results.
Neural dynamics of the intention to speak.
The findings suggest that the parietal cortex plays a multimodal role in monitoring intentional mechanisms in both action and language, and the coactivation of parietal regions and Broca's area may constitute the cortical circuit specific for controlling intentional processes during speech.
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It is found that activity in the right and left parietal cortex increased before subjects became aware of intending to speak and the coactivation of parietal regions and Broca’s area may constitute the cortical circuit specific for controlling intentional processes during speech.
Conscious motor intention emerges in the inferior parietal lobule
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It is proposed that when a movement is planned, activity in the parietal cortex, as part of a cortico-cortical sensorimotor processing loop, generates a predictive internal model of the upcoming movement that might form the neural correlate of motor awareness.
Functional organization of human supplementary motor cortex studied by electrical stimulation
  • I. Fried, A. Katz, D. Spencer
  • Biology, Medicine
    The Journal of neuroscience : the official journal of the Society for Neuroscience
  • 1991
Electrical stimulation mapping with currents below the threshold of afterdischarges showed somatotopic organization of supplementary motor cortex with the lower extremities represented posteriorly, head and face most anteriorly, and the upper extremities between these two regions.
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Patients with lesions restricted to the parietal cortex were found to be impaired selectively at predicting, through mental imagery, the time necessary to perform differentiated finger movements and visually guided pointing gestures, in comparison to normal individuals and to a patient with damage to the primary motor area.
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Compared conditions in which participants made self-paced actions and attended either to their intention to move or to the actual movement, activity in the pre-supplementary motor area reflects the representation of intention.
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It is concluded that the parietal cortex plays an important role in generating and maintaining a kinaesthetic model of ongoing movements, and parietal lesions alter the representational aspects of gestures, and suggest a failure in evaluating and comparing internal and external feedback about movement.
On the relation between brain potentials and the awareness of voluntary movements
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The role of motor intention in motor awareness: an experimental study on anosognosia for hemiplegia.
This is the first direct demonstration that altered awareness of action in AHP reflects a dominance of motor intention prior to action over sensory information about the actual effects of movement.