title: Meta-analytic investigations of structural grey matter, executive domain-related functional activations, and white matter diffusivity in obsessive compulsive disorder: an integrative review.
abstract: Obsessive-compulsive disorder (OCD) is a debilitating disorder. However, existing neuroimaging findings involving executive function and structural abnormalities in OCD have been mixed. Here we conducted meta-analyses to investigate differences in OCD samples and controls in: Study 1 - grey matter structure; Study 2 - executive function task-related activations during (i) response inhibition, (ii) interference, and (iii) switching tasks; and Study 3 - white matter diffusivity. Results showed grey matter differences in the frontal, striatal, thalamus, parietal and cerebellar regions; task domain-specific neural differences in similar regions; and abnormal diffusivity in major white matter regions in OCD samples compared to controls. Our results reported concurrence of abnormal white matter diffusivity with corresponding abnormalities in grey matter and task-related functional activations. Our findings suggested the involvement of other brain regions not included in the cortico-striato-thalamo-cortical network, such as the cerebellum and parietal cortex, and questioned the involvement of the orbitofrontal region in OCD pathophysiology. Future research is needed to clarify the roles of these brain regions in the disorder.
authors.affiliation: Division of Psychology, School of Humanities and Social Sciences, Nanyang Technological University, 14 Nanyang Drive, Singapore 637332, Singapore.
authors.forename: Goi Khia
authors.initials: GK
authors.lastname: Eng
authors.affiliation: Department of General Psychiatry, Institute of Mental Health, 10 Buangkok View, Singapore 539747, Singapore.
authors.forename: Kang
authors.initials: K
authors.lastname: Sim
authors.affiliation: Division of Psychology, School of Humanities and Social Sciences, Nanyang Technological University, 14 Nanyang Drive, Singapore 637332, Singapore; Centre for Research and Development in Learning, 62 Nanyang Drive, Singapore 637459, Singapore. Electronic address: annabelchen@ntu.edu.sg.
authors.forename: Shen-Hsing Annabel
authors.initials: SH
authors.lastname: Chen
mesh_terms: D001921:Brain / Q000473:pathology*; D003072:Cognition Disorders / Q000209:etiology*; D056344:Executive Function / Q000502:physiology*; D066128:Gray Matter / Q000473:pathology; D006801:Humans; D009771:Obsessive-Compulsive Disorder / Q000150:complications* / Q000473:pathology*; D066127:White Matter / Q000473:pathology
keywords: Activation-likelihood estimation (ALE); Cortical–striato–thalamo–cortical network; Executive function; Inhibition; Meta-analysis; Neuroimaging; Obsessive–compulsive disorder; Sub-cortical