title: Clinical Utility and Lifespan Profiling of Neurological Soft Signs in Schizophrenia Spectrum Disorders.
abstract: Neurological soft signs (NSSs) bear the promise for early detection of schizophrenia spectrum disorders. Nonetheless, the sensitivity and specificity of NSSs in the psychosis continuum remains a topic of controversy. It is also unknown how NSSs reveal neurodevelopmental abnormality in schizophrenia. We investigated the effect sizes of NSSs in differentiating individuals with schizophrenia spectrum disorders from individuals with other psychiatric conditions and from covariate-matched healthy subjects. We also investigated the partitioned age-related variations of NSSs in both schizophrenia and healthy individuals. NSSs were assessed by the abridged version of the Cambridge Neurological Inventory (CNI) in 3105 participants, consisting of healthy individuals (n=1577), unaffected first-degree relatives of schizophrenia patients (n= 155), individuals with schizotypal personality disorder (n= 256), schizophrenia patients (n= 738), and other psychiatric patients (n= 379). Exact matching and propensity score matching procedures were performed to control for covariates. Multiple regression was used to partition age-related variations. Individuals along the schizophrenia continuum showed elevated levels of NSSs, with moderate effect sizes, in contrast to other psychiatric patients who had minimal NSSs, as well as matched healthy controls. Furthermore, the age-and-NSS relationship in schizophrenia patients was represented by a flat but overall elevated pattern, in contrast to a U-shaped pattern in healthy individuals. In sum, NSSs capture a moderate portion of psychosis proneness with reasonable specificity. Lifespan profiling reveals an abnormal developmental trajectory of NSSs in schizophrenia patients, which supports the endophenotype hypothesis of NSSs by associating it with the neurodevelopmental model of schizophrenia.
authors.affiliation: Neuropsychology and Applied Cognitive Neuroscience Laboratory, Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China, rckchan@psych.ac.cn.
authors.forename: Raymond C K
authors.initials: RC
authors.lastname: Chan
authors.affiliation: Department of Psychology, University of California, Riverside, CA, USA.
authors.forename: Weizhen
authors.initials: W
authors.lastname: Xie
authors.affiliation: Neuropsychology and Applied Cognitive Neuroscience Laboratory, Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China, University of Chinese Academy of Sciences, Beijing, China.
authors.forename: Fu-lei
authors.initials: FL
authors.lastname: Geng
authors.affiliation: Neuropsychology and Applied Cognitive Neuroscience Laboratory, Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China.
authors.forename: Ya
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Neuropsychology and Applied Cognitive Neuroscience Laboratory, Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China, University of Chinese Academy of Sciences, Beijing, China, Castle Peak Hospital, Hong Kong Special Administrative Region, China;
authors.forename: Simon S Y
authors.initials: SS
authors.lastname: Lui
authors.affiliation: Beijing Key Laboratory of Mental Disorders, Department of Psychiatry, Beijing Anding Hospital, Capital Medical University, Beijing, China, Centre of Schizophrenia, Beijing Institute for Brain Disorders, Laboratory of Brain Disorders (Capital Medical University), Ministry of Science and Technology, Beijing, China.
authors.forename: Chuan-yue
authors.initials: CY
authors.lastname: Wang
authors.affiliation: Peking University Sixth Hospital, Beijing, China, Peking University Institute of Mental Health, Beijing, China, Key Laboratory of Mental Health, Ministry of Health (Peking University), Beijing, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Yu
authors.affiliation: Castle Peak Hospital, Hong Kong Special Administrative Region, China;
authors.forename: Eric F C
authors.initials: EF
authors.lastname: Cheung
authors.affiliation: Department of Psychology, University of California, Riverside, CA, USA.
authors.forename: Robert
authors.initials: R
authors.lastname: Rosenthal
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011618:Psychotic Disorders / Q000453:epidemiology / Q000503:physiopathology*; D012559:Schizophrenia / Q000453:epidemiology / Q000503:physiopathology*; D012569:Schizotypal Personality Disorder / Q000453:epidemiology / Q000503:physiopathology*; D055815:Young Adult
keywords: endophenotype; lifespan profiling; neurological soft sign; psychopathology; schizophrenia spectrum disorders