Abstract
Functional coupling of regional cerebral metabolic rates for glucose measured with [18F]-Fluoro-2-deoxy-D-glucose PET was compared in 18 drug-free patients with Tourette's Syndrome (TS) and 16 age- and sex-matched control subjects. Pearson product-moment correlation matrices containing correlations between metabolic rates in regions sampled throughout the brain were generated independently for TS patients and controls and compared. Significant differences between Z-transformed correlation coefficients were used to identify group differences, and revealed that the connectivity of the ventral striatum was most severely affected in TS. Changes in the coupling of other brain areas—primary motor areas, somatosensory association areas, and insula—also appeared to differentiate TS patients and controls. Evaluation of interrelationships between cortico-striato-thalamo-cortical circuits revealed the existence of functional connections between the motor and lateral orbitofrontal circuits in both groups, however, a reversal in the pattern of these interactions differentiated TS patients and controls. In controls, activity in these circuits appeared to be negatively correlated —i.e. increased activity in one is associated with relative inactivity the other. In TS patients, on the other hand, activity in the motor and lateral orbitofrontal circuits appears to be positively coupled. These results lend further credence to the hypothesis that altered limbic-motor interactions represent a pathophysiological hallmark of this disease.
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Jeffries, K., Schooler, C., Schoenbach, C. et al. The Functional Neuroanatomy of Tourette's Syndrome: An FDG PET Study III: Functional Coupling of Regional Cerebral Metabolic Rates. Neuropsychopharmacol 27, 92–104 (2002). https://doi.org/10.1016/S0893-133X(01)00428-6
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DOI: https://doi.org/10.1016/S0893-133X(01)00428-6
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