Abstract
Obsessive-compulsive disorder (OCD) is a mental illness causing patients to suffer from recurring undesirable thoughts (obsessions) conducting to do affairs repetitively (compulsions). Brain signals recorded by Electroencephalogram (EEG) can be analyzed in order to present a diagnostic procedure considering the localization approach. In this study, the signals acquired by EEG have been recorded from three groups; two case groups; patients with severe obsessive symptoms and patients with severe compulsive symptoms, and one healthy control group. Brain signal processing techniques have been applied on the signals emitted from frontal and parieto-occipital regions to discover the features leading to the best discrimination between case groups and healthy controls. In this regard, after preprocessing, the features of time and frequency domains presenting the significant meaningful relation were nominated for classification by linear discrimination analysis (LDA). Although the parieto-occipital region performed better in the diagnosis for both obsessive and compulsive groups, the features gained from the frontal cortex resulted in better discrimination for only the compulsive group. In addition, time domain features had a more significant influence in diagnosis rather than frequency domain for both case groups. The study presented particular characteristics of brain signals in two dimensions of OCD in specific brain regions leading to more accurate presurgical assessments in the studies between the affected brain regions and behavioral issues.
Highlights
Obsessive compulsive disorder (OCD) is a mental health condition accompanied by the presence of obsessions such as intrusive and unwanted thoughts, and compulsions such as repetitive and intentional rituals [1]
This study was performed with focus on realizing obsessive group and compulsive group in spite of the strong correlation between these types of behavioral disorder
Patients with obsessive symptoms without compulsive symptoms, and the subjects with compulsive symptoms without obsessive symptoms were indicated as obsessive group and compulsive group, respectively
Summary
Obsessive compulsive disorder (OCD) is a mental health condition accompanied by the presence of obsessions such as intrusive and unwanted thoughts, and compulsions such as repetitive and intentional rituals [1]. The disorder is ranked by the World Health organization (WHO) as one of the ten most handicapping conditions leading to losing income and decreased quality of life [3]. It is the fourth most common mental disorder after depression, alcohol/substance misuse, and social phobia [4]. OCD is diagnosed using various types of methods such as diagnostic interviews, clinician-rated instruments, family-report questionnaires, and self-report questionnaires [6]. Yale-Brown Obsessive-Compulsive Scale (YBOCS), is one of the most common questionnaires for OCD identifies different dimensions of OCD and divides it in two main categories; 1) obsessive criteria with symptoms such as fear, religious, unwanted thoughts and etc. 2) compulsive criteria with obsessive thinking, leading, checking, counting, washing, and etc. [11]
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