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Changes of motor cortical excitability and response inhibition in patients with obsessive–compulsive disorder

Authors
 Jee In Kang  ;  Deog Young Kim  ;  Chang-il Lee  ;  Chan-Hyung Kim  ;  Se Joo Kim 
Citation
 Journal of Psychiatry & Neuroscience, Vol.44(4) : 261-268, 2019 
Journal Title
 Journal of Psychiatry & Neuroscience 
ISSN
 1180-4882 
Issue Date
2019
Abstract
BACKGROUND: Deficits in cortical inhibitory processes have been suggested as underlying pathophysiological mechanisms of obsessive–compulsive disorder (OCD). We examined whether patients with OCD have altered cortical excitability using paired-pulse transcranial magnetic stimulation (TMS). We also tested associations between TMS indices and OCD-related characteristics, including age of onset and response inhibition in the go/no-go paradigm, to examine whether altered cortical excitability contributes to symptom formation and behavioural inhibition deficit in patients with OCD. METHODS: We assessed motor cortex excitability using paired-pulse TMS in 51 patients with OCD and 39 age-matched healthy controls. We also assessed clinical symptoms and response inhibition in the go/nogo task. All patients were undergoing treatment with serotonin reuptake inhibitors. We performed repeated-measures multivariate analysis of covariance to compare TMS indices between patients with OCD and controls. RESULTS: Compared to controls, patients with OCD showed a shorter cortical silent period and decreased intracortical facilitation. However, we found no significant difference between groups for resting motor threshold or short-interval intracortical inhibition. In the OCD group, the shortened cortical silent period was associated with a prompt reaction time in the go/no-go task and with early onset of OCD. LIMITATIONS: We could not exclude the influence of medications on motor cortex excitability. CONCLUSION: These findings suggest abnormal cortical excitability in patients with OCD. The associations between cortical silent period and response inhibition and age of onset further indicate that altered cortical excitability may play an important role in the development of OCD.
Files in This Item:
T201902048.pdf Download
DOI
10.1503/jpn.180064
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Psychiatry (정신과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Rehabilitation Medicine (재활의학교실) > 1. Journal Papers
Yonsei Authors
Kang, Jee In(강지인) ORCID logo https://orcid.org/0000-0002-2818-7183
Kim, Deog Young(김덕용) ORCID logo https://orcid.org/0000-0001-7622-6311
Kim, Se Joo(김세주) ORCID logo https://orcid.org/0000-0002-5438-8210
Kim, Chan Hyung(김찬형)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/170291
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