title: Identification of imaging biomarkers in schizophrenia: a coefficient-constrained independent component analysis of the mind multi-site schizophrenia study.
abstract: A number of recent studies have combined multiple experimental paradigms and modalities to find relevant biological markers for schizophrenia. In this study, we extracted fMRI features maps from the analysis of three experimental paradigms (auditory oddball, Sternberg item recognition, sensorimotor) for a large number (n=154) of patients with schizophrenia and matched healthy controls. We used the general linear model (GLM) and independent component analysis (ICA) to extract feature maps (i.e. ICA component maps and GLM contrast maps), which were then subjected to a coefficient-constrained independent component analysis (CCICA) to identify potential neurobiological markers. A total of 29 different feature maps were extracted for each subject. Our results show a number of optimal feature combinations that reflect a set of brain regions that significantly discriminate between patients and controls in the spatial heterogeneity and amplitude of their feature signals. Spatial heterogeneity was seen in regions such as the superior/middle temporal and frontal gyri, bilateral parietal lobules, and regions of the thalamus. Most strikingly, an ICA feature representing a bilateral frontal pole network was consistently seen in the ten highest feature results when ranked on differences found in the amplitude of their feature signals. The implication of this frontal pole network and the spatial variability which spans regions comprising of bilateral frontal/temporal lobes and parietal lobules suggests that they might play a significant role in the pathophysiology of schizophrenia.
authors.affiliation: The Mind Research Network, 1101 Yale Boulevard NE, Albuquerque, NM 87131, USA. dkim@mrn.org
authors.forename: Dae Il
authors.initials: DI
authors.lastname: Kim
authors.forename: Jing
authors.initials: J
authors.lastname: Sui
authors.forename: Srinivas
authors.initials: S
authors.lastname: Rachakonda
authors.forename: Tonya
authors.initials: T
authors.lastname: White
authors.forename: Dara S
authors.initials: DS
authors.lastname: Manoach
authors.forename: V P
authors.initials: VP
authors.lastname: Clark
authors.forename: Beng-Choon
authors.initials: BC
authors.lastname: Ho
authors.forename: S Charles
authors.initials: SC
authors.lastname: Schulz
authors.forename: Vince D
authors.initials: VD
authors.lastname: Calhoun
mesh_terms: D000328:Adult; D001307:Auditory Perception / Q000502:physiology; D015415:Biomarkers; D001921:Brain / Q000098:blood supply* / Q000473:pathology* / Q000503:physiopathology; D001931:Brain Mapping; D004192:Discrimination, Psychological / Q000502:physiology; D005260:Female; D007839:Functional Laterality; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D016014:Linear Models; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009483:Neuropsychological Tests; D010100:Oxygen / Q000097:blood; D025341:Principal Component Analysis; D011597:Psychomotor Performance / Q000502:physiology; D021641:Recognition, Psychology / Q000502:physiology; D012559:Schizophrenia / Q000175:diagnosis* / Q000503:physiopathology*; D055815:Young Adult
chemical_list: D015415:Biomarkers; D010100:Oxygen