In 2016, the World Journal of Psychiatry (WJP) has published the 4^th issue which containing 7 articles contributed by scientists worldwide. Among these comprehensive articles are (1) “Catatonia: Our current understanding of its diagnosis, treatment and pathophysiology”, a Review by Sean A Rasmussen, PhD, et al from the MINDS Program, McMaster University, Canada; (2) “Reasoning and Rehabilitation cognitive skills programme for mentally disordered offenders: Predictors of outcome”, an Original Article by Susan Young, PhD, DClinPsy, BSc, AFBPS, CSci, Senior Clinical Lecturer, et al from the Imperial College London, United Kingdom; and (3) “Cognitive-behavioural therapy for obsessive-compulsive disorder co-occurring with psychosis: Systematic review of evidence”, a Systematic Reviews by Antonio Tundo, MD, et al from the Istituto di Psicopatologia, Italy, etc. We invite you to peruse all 7 articles in this issue, as they present the latest research progress/findings and provide insightful comments in psychiatry that will guide basic research and clinical practice in these fields.

This journal is an open-access journal which allows free immediate access to all full-text articles. For details, please visit: Volume 6, Issue 4, December 22, 2016.

Figure 1 The cover of the issue.Editorial Board Member of World Journal of Psychiatry, Hsien-Yuan Lane, MD, PhD, Doctor, Department of Psychiatry, China Medical University Hospital, Taichung 404, Taiwan

The WJP is a leading academic journal devoted to reporting the latest, cutting-edge research progress and findings of basic research and clinical practice in the field of psychiatry. It was launched on December 31, 2011 and is published trimonthly (4 issues annually) by BPG, the world's leading professional clinical medical journal publishing company.

We encourage psychiatrists worldwide to submit manuscripts to the WJP describing their original basic or clinical research findings that are of high academic value and which report new diagnostic techniques or summarize their treatment experiences.

We invited the readers to download and read the E-Journal of this issue, at: http://www.wjgnet.com/2220-3206/e-journal.htm.