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Updated: May 22, 2026

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Decreased functional brain activation in Friedreich ataxia using the Simon effect task.

N Georgiou-Karistianis1, H Akhlaghi, L A Corben

  • 1Experimental Neuropsychology Research Unit, School of Psychology and Psychiatry, Monash University, Clayton 3800, Victoria, Australia. nellie.georgiou-karistianis@monash.edu

Brain and Cognition
|May 1, 2012
PubMed
Summary

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Friedreich

Area of Science:

  • Neuroscience
  • Neurology
  • Cognitive Neuroscience

Background:

  • Friedreich ataxia (FRDA) is a rare inherited disease.
  • It causes progressive nervous system damage.
  • Understanding brain reorganization in FRDA is crucial for developing interventions.

Purpose of the Study:

  • To investigate functional brain reorganization in individuals with FRDA.
  • To examine the impact of FRDA on cognitive and attention networks.
  • To explore disruptions in cortico-cerebellar loops.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Participants performed a Simon effect task with congruent and incongruent stimuli.
  • Thirteen individuals with FRDA and 14 controls were recruited.

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Main Results:

  • Both groups showed common brain activation patterns during the Simon task.
  • Individuals with FRDA exhibited reduced functional activation in multiple brain regions.
  • FRDA patients displayed a larger Simon effect behaviorally and reduced cortico-subcortical connectivity.

Conclusions:

  • FRDA is associated with widespread functional brain reorganization.
  • Disrupted cortico-cerebellar loops and impaired cognitive/attention engagement are implicated.
  • These findings highlight the neurological impact of Friedreich ataxia.