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Related Experiment Videos

Altered cortical visual processing in PD with hallucinations: an fMRI study.

G T Stebbins1, C G Goetz, M C Carrillo

  • 1Department of Neurological Sciences, Rush University Medical Center, 1725 West Harrison Street, Suite 309, Chicago, IL 60612, USA. gstebbin@rush.edu

Neurology
|October 27, 2004
PubMed
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Parkinson disease patients experiencing visual hallucinations show increased frontal and subcortical brain activation compared to those without hallucinations. This suggests altered brain network organization may contribute to visual hallucinations in Parkinson disease.

Area of Science:

  • Neuroscience
  • Neurology
  • Neuroimaging

Background:

  • Parkinson disease (PD) is a neurodegenerative disorder affecting motor function.
  • Visual hallucinations are a common non-motor symptom in PD, impacting patient quality of life.
  • The neural mechanisms underlying visual hallucinations in PD remain incompletely understood.

Purpose of the Study:

  • To investigate differences in brain activation patterns using functional magnetic resonance imaging (fMRI) between PD patients with and without visual hallucinations.
  • To compare brain responses to distinct visual stimulation paradigms in these two PD groups.

Main Methods:

  • A case-control study involving 12 pairs of age-, PD duration-, and dopaminergic drug exposure-matched Parkinson disease subjects.
  • fMRI was used to assess brain activation during stroboscopic (flashing) versus no visual stimulation.

Related Experiment Videos

  • fMRI was also employed to examine responses to kinematic (apparent motion) versus stationary visual stimulation.

    • Main Results:

    • During stroboscopic stimulation, non-hallucinating PD subjects exhibited greater activation in the parietal lobe and cingulate gyrus compared to hallucinating PD subjects.
    • Hallucinating PD subjects showed increased activation in the inferior frontal gyrus and caudate nucleus during stroboscopic stimulation.
    • During kinematic stimulation, non-hallucinating PD subjects displayed greater activation in area V5/MT, parietal lobe, and cingulate gyrus, while hallucinating PD subjects showed increased activation in the superior frontal gyrus.

    Conclusions:

    • Parkinson disease patients with chronic visual hallucinations demonstrate distinct patterns of brain activation, with greater frontal and subcortical involvement and reduced visual cortical activation.
    • The observed shift in activation from posterior visual areas to anterior attention-related regions suggests altered network organization in the pathophysiology of visual hallucinations in PD.
    • These findings highlight the role of network dysfunction in the generation of visual hallucinations in Parkinson disease.