200-300Hz movement modulated oscillations in the internal globus pallidus of patients with Parkinson's Disease

Christos Tsiokos, Xiao Hu, Nader Pouratian

Research output: Contribution to journalArticlepeer-review

Abstract

Symptoms in Parkinson's Disease (PD) have been linked to oscillatory activity within the basal ganglia. In humans, such activity has been detected mainly in the local field potentials (LFPs) recorded from electrode contacts used for deep brain stimulation. Although most studies have focused on activity within the subthalamic nucleus (STN), the internal part of the globus pallidus (GPi) is considered an equally efficacious site for therapeutic neuromodulation. Moreover, while most investigations have evaluated changes in oscillatory activity in the beta (12-35. Hz) and gamma (35-100. Hz) bands, our preliminary spectral analysis of LFP signals in the GPi suggested distinct activity at higher frequencies as well. We hypothesized there is a unique LFP signature in the GPi that consists of movement modulated spectral power increases above 100. Hz. Using invasive recordings from the GPi of patients undergoing DBS, in addition to confirming increased beta band activity within the GPi of patients with PD, we have identified and characterized a previously undescribed peak between 200 and 300. Hz centered at approximately 235. Hz, whose height and width but not center frequency are movement modulated. An increase in peak height is not transient, but rather persists for the duration of movement. The 200-300. Hz rhythms in the GPi could have a functional role in the basal ganglia reentrant circuits by encoding output information entering the thalamo-cortical network or by organizing downstream activity for the successful execution of tasks.

Original languageEnglish (US)
Pages (from-to)464-474
Number of pages11
JournalNeurobiology of Disease
Volume54
DOIs
StatePublished - Jun 2013
Externally publishedYes

Keywords

  • Basal ganglia
  • Globus pallidus
  • Oscillatory activity
  • Parkinson's Disease
  • Pathophysiology
  • Power spectrum

ASJC Scopus subject areas

  • Neurology

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