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Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...

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Increased beta synchronization underlies perception-action hyperbinding in functional movement disorders.

Bernhard Pastötter1,2, Anne Weissbach3, Adam Takacs4

  • 1Department of Cognitive Psychology, University of Trier, 54296 Trier, Germany.

Brain Communications
|October 10, 2024
PubMed
Summary
This summary is machine-generated.

Functional movement disorders involve impaired stimulus-response integration, not just retrieval. This study found increased post-movement beta synchronization in patients, suggesting a hyperbinding mechanism in perception and action.

Keywords:
binding and retrieval in action controlfunctional movement disorderperception-action integrationpost-movement beta oscillationstheory of event coding

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Area of Science:

  • Neuroscience
  • Neurology
  • Cognitive Science

Background:

  • Functional movement disorders are common and disabling neurological conditions with limited understanding of their pathophysiology.
  • Traditionally viewed as psychiatric, recent studies suggest cognitive alterations and neural principles underlying these disorders.
  • Prior research indicated altered retrieval of stimulus-response bindings in patients.

Purpose of the Study:

  • To investigate whether the initial integration of stimulus and response information is disrupted in functional movement disorders.
  • To explore the role of oscillatory activity and functional neuroanatomy in stimulus-response binding integration.
  • To identify potential neural mechanisms contributing to movement impairments.

Main Methods:

  • Reanalysis of existing electroencephalography (EEG) data using refined methods.
  • Analysis of oscillatory activity and functional neuroanatomy related to stimulus-response binding.
  • Utilizing beamformer analysis to localize brain regions involved in the observed effects.

Main Results:

  • Post-movement beta synchronization predicts behavioral stimulus-response binding.
  • Patients with functional movement disorders showed significantly increased post-movement beta synchronization compared to controls.
  • The observed differences were localized to the supplementary motor areas.

Conclusions:

  • The integration of stimulus and response information is impaired early in functional movement disorders.
  • A phenomenon of hyperbinding between perception and action may underlie movement impairments.
  • Findings offer new insights into the pathophysiology of functional movement disorders, extending beyond retrieval deficits.