Joo Pyung Kim1,2, Hoon-Ki Min1,3,4, Emily J Knight1, Penelope S Duffy1, Osama A Abulseoud5, Michael P Marsh1, Katherine Kelsey1, Charles D Blaha6, Kevin E Bennet1,3, Mark A Frye5, Kendall H Lee1,4. 1. Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, USA. 2. Department of Neurosurgery, CHA University, Bundang CHA Medical Center, Sungnam, Republic of Korea. 3. Division of Engineering, Mayo Clinic, Rochester, Minnesota, USA. 4. Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA. 5. Department of Psychiatry and Psychology, Mayo Clinic, Rochester, Minnesota, USA. 6. Department of Psychology, University of Memphis, Memphis, TN, USA.
Abstract
BACKGROUND: Deep brain stimulation (DBS) of the centromedian-parafascicular (CM-Pf) thalamic nuclei has been considered an option for treating Tourette syndrome. Using a large animal DBS model, this study was designed to explore the network effects of CM-Pf DBS. METHODS: The combination of DBS and functional magnetic resonance imaging is a powerful means of tracing brain circuitry and testing the modulatory effects of electrical stimulation on a neuronal network in vivo. With a within-subjects design, we tested the proportional effects of CM and Pf DBS by manipulating current spread and varying stimulation contacts in healthy pigs (n = 5). RESULTS: Our results suggests that CM-Pf DBS has an inhibitory modulating effect in areas that have been suggested as contributing to impaired sensory-motor and emotional processing. The results also help to define the differential neural circuitry effects of the CM and Pf with evidence of prominent sensorimotor/associative effects for CM DBS and prominent limbic/associative effects for Pf DBS. CONCLUSIONS: Our results support the notion that stimulation of deep brain structures, such as the CM-Pf, modulates multiple networks with cortical effects. The networks affected by CM-Pf stimulation in this study reinforce the conceptualization of Tourette syndrome as a condition with psychiatric and motor symptoms and of CM-Pf DBS as a potentially effective tool for treating both types of symptoms.
BACKGROUND: Deep brain stimulation (DBS) of the centromedian-parafascicular (CM-Pf) thalamic nuclei has been considered an option for treating Tourette syndrome. Using a large animal DBS model, this study was designed to explore the network effects of CM-Pf DBS. METHODS: The combination of DBS and functional magnetic resonance imaging is a powerful means of tracing brain circuitry and testing the modulatory effects of electrical stimulation on a neuronal network in vivo. With a within-subjects design, we tested the proportional effects of CM and Pf DBS by manipulating current spread and varying stimulation contacts in healthy pigs (n = 5). RESULTS: Our results suggests that CM-Pf DBS has an inhibitory modulating effect in areas that have been suggested as contributing to impaired sensory-motor and emotional processing. The results also help to define the differential neural circuitry effects of the CM and Pf with evidence of prominent sensorimotor/associative effects for CM DBS and prominent limbic/associative effects for Pf DBS. CONCLUSIONS: Our results support the notion that stimulation of deep brain structures, such as the CM-Pf, modulates multiple networks with cortical effects. The networks affected by CM-Pf stimulation in this study reinforce the conceptualization of Tourette syndrome as a condition with psychiatric and motor symptoms and of CM-Pf DBS as a potentially effective tool for treating both types of symptoms.
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