title: BOLD response during visual perception of biological motion in obsessive-compulsive disorder : an fMRI study using the dynamic point-light animation paradigm.
abstract: OBJECTIVE
  Although research has shown that deficits in various cognitive functions may underlie obsessive-compulsive disorder (OCD), studies have not yet clarified the specificity and etiology of perception processing, particularly the perception of biological motion that is correlated with social cognition. We used functional magnetic resonance imaging (fMRI) to investigate neural activity associated with the perception of biological motion in OCD patients.
  
  
  METHODS
  The subjects were 15 patients with OCD and 15 age- and IQ-matched healthy volunteers. All subjects participated in a biological motion task in which they performed a one-back task signaling a repeated stimulus with a key press in each block condition to obligate attention to both types of stimuli.
  
  
  RESULTS
  The biological motion versus scrambled motion contrast revealed that both OCD patients and healthy controls exhibited increased activation of the superior and middle temporal gyrus, the regions implicated in processing of biological motion, which is consistent with previous studies. However, direct comparison between OCD subjects and healthy controls indicated that patients with OCD exhibited increased activation in the right superior and middle temporal gyrus and the left inferior temporal and fusiform gyrus, and reduced activation in the right postcentral gyrus (BA 40) compared to healthy subjects. OCD patients exhibited increased activation in the ventral visual system, including the inferior temporal and fusiform gyrus.
  
  
  CONCLUSIONS
  We observed a differential pattern of activity between OCD patients and healthy controls, indicating that OCD patients have functional differences related to the perception of biological motion. The differential activation between OCD patients and healthy subjects might contribute to the pathophysiological understanding of obsessive compulsive disorder.
authors.affiliation: Interdisciplinary Program in Brain Science and in Cognitive Science, Seoul National University, Seoul, Korea.
authors.forename: Wi Hoon
authors.initials: WH
authors.lastname: Jung
authors.forename: Bon-Mi
authors.initials: BM
authors.lastname: Gu
authors.forename: Do-Hyung
authors.initials: DH
authors.lastname: Kang
authors.forename: Ji-Young
authors.initials: JY
authors.lastname: Park
authors.forename: So Young
authors.initials: SY
authors.lastname: Yoo
authors.forename: Chi-Hoon
authors.initials: CH
authors.lastname: Choi
authors.forename: Jong-Min
authors.initials: JM
authors.lastname: Lee
authors.forename: Jun Soo
authors.initials: JS
authors.lastname: Kwon
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D002540:Cerebral Cortex / Q000503:physiopathology*; D005260:Female; D007839:Functional Laterality; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D009039:Motion Perception; D009771:Obsessive-Compulsive Disorder / Q000503:physiopathology* / Q000523:psychology; D010775:Photic Stimulation / Q000379:methods; D013702:Temporal Lobe / Q000503:physiopathology*; D014796:Visual Perception; D055815:Young Adult