Altered motor network activation and functional connectivity in adult Tourette's syndrome.
Tourette's syndrome (TS) is a developmental neuropsychiatric disorder characterized by motor and vocal tics as well as psychiatric comorbidities. Disturbances of the fronto-striatal-thalamic pathways responsible for motor control and impulse inhibition have been previously described in other studies. Although differences in motor performance are well recognized, imaging data elucidating the neuronal correlates are scarce. Here, we examined 19 adult TS patients (13 men, aged 22-52 years, mean = 34.3 years) and 18 age- and sex-matched controls (13 men, aged 24-57 years, mean = 37.6 years) in a functional magnetic resonance imaging study at 1.5 T. We corrected for possible confounds introduced by tics, motion, and brain-structural differences as well as age, sex, comorbidities, and medication. Patients and controls were asked to perform a sequential finger-tapping task using their right, left, and both hands, respectively. Task performance was monitored by simultaneous MR-compatible video recording. Although behavioral data obtained during scanning did not show significant differences across groups, we observed differential neuronal activation patterns depending on both handedness (dominant vs. nondominant) and tapping frequency in frontal, parietal, and subcortical areas. When controlling for open motor performance, a failure of deactivation in easier task conditions was found in the subgenual cingulate cortex in the TS patients. In addition, performance-related functional connectivity of lower- and higher-order motor networks differed between patients and controls. In summary, although open performance was comparable, patients showed different neuronal networks and connectivity patterns when performing increasingly demanding tasks, further illustrating the impact of the disease on the motor system.
Forschungszentrum Jülich, Institute of Neuroscience and Medicine - IMN 4, Juelich, Germany.
Cornelius J
CJ
Werner
Tony
T
Stöcker
Thilo
T
Kellermann
Jessica
J
Bath
Margarete
M
Beldoch
Frank
F
Schneider
Hans Peter
HP
Wegener
Jon N
JN
Shah
Irene
I
Neuner
D000328:Adult; D000375:Aging / Q000502:physiology; D002540:Cerebral Cortex / Q000473:pathology; D003071:Cognition / Q000502:physiology; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D038801:International Classification of Diseases; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009046:Motor Neurons / Q000502:physiology*; D009415:Nerve Net / Q000473:pathology*; D009434:Neural Pathways / Q000473:pathology*; D025341:Principal Component Analysis; D011597:Psychomotor Performance / Q000502:physiology; D005879:Tourette Syndrome / Q000473:pathology* / Q000523:psychology; D055815:Young Adult
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