Preliminary psychometric properties of the brief Negative Symptom Scale in youth at Clinical High-Risk for psychosis
Section snippets
Role of funding source
Research was supported by K23-MH092530 to Dr. Strauss and a State University of New York Transdisciplinary Areas of Excellence Grant to Dr. Strauss.
Contributors
G.P.S. designed the study, conducted study assessments, and performed statistical analyses. G.P.S. and H.C.C. wrote the initial draft of the manuscript.
Conflict of interest
G.P.S. is one of the original developers of the Brief Negative Symptom Scale (BNSS) and receives royalties and consultation fees from ProPhase LLC in connection with commercial use of the BNSS and other professional activities.
Acknowledgments
Thank you to the participants who dedicated their time to this research, as well as staff and students in Dr. Strauss' laboratory who conducted scheduling and carried out research assessments: Katherine Frost Visser, Kayla Whearty, Lindsay Morra, Elizabeth Dickinson, Kathryn Ossenfort, and Laura Crespo.
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Factor structure of the brief negative symptom scale
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2021, European NeuropsychopharmacologyCitation Excerpt :Prior to completing the Temporal Utility Integration task, examiners who were trained to reliability standards (ICC > 0.80), conducted a structured diagnostic interview with all participants to complete the SCID-I, SCID-PD, SIPS, BNSS, GFS:S, GFS:R. SIPS interviews were either performed directly by the PI or by a clinical psychology doctoral student or lab staff member trained to reliability standards who consulted with the PI on all cases for consensus. Negative symptoms were rated using the Brief Negative Symptom Scale (BNSS; Kirkpatrick et al., 2011), which was previously adapted for use in CHR populations with good reliability and validity (Strauss and Chapman, 2018). Functional outcome was assessed using the Global Functioning Scale Social and Role instruments (GFS:S and GFS:R; Cornblatt et al., 2007).
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2021, Schizophrenia ResearchCitation Excerpt :There are also issues associated with adapting existing scales designed for adults with diagnosable psychotic disorders to the CHR population. The CAINS (Gur et al., 2015) and BNSS (Strauss and Chapman, 2018) were both recently adapted for use in CHR youth. The adaptations focused on revising item probes (i.e., questions used in the interview) to make them more applicable to CHR youth, but did not modify item anchors that are used to make ratings.
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2021, Schizophrenia ResearchA review of negative symptom assessment strategies in youth at clinical high-risk for psychosis
2020, Schizophrenia ResearchCitation Excerpt :Given that negative symptoms can result from multiple psychological and biological mechanisms (i.e., equifinality) (Strauss and Cohen, 2017), it is paramount that new scales be developed that assess the construct with enough precision to disentangle processes unique to negative versus other symptoms (e.g., positive, disorganized). Initial attempts to address this need in the field focused on adapting scales designed for schizophrenia (Strauss and Chapman, 2018; Gur et al., 2015); however, the adaptations were not ideal. Measures designed specifically for the unique needs of CHR youth are needed.
Specificity and sensitivity of the Self-assessment of Negative Symptoms (SNS) in patients with schizophrenia
2019, Schizophrenia ResearchCitation Excerpt :Whether self-reports have previously been developed to evaluate psychotic symptoms in schizophrenia (Niv et al., 2007) and prodromal psychotic symptoms (Kobayashi et al., 2008; Kelleher et al., 2011), they do not allow screening negative symptoms. The recent scales, BNSS and CAINS were adapted for assessing negative symptoms in clinical high-risk population but are still based on interviews (Strauss and Chapman, 2018; Gur et al., 2015). Consequently, the SNS based on self-assessment might be a valuable and complementary tool for detecting negative symptoms at an early stage of illness.
Negative symptom dimensions differentially impact on functioning in individuals at-risk for psychosis
2018, Schizophrenia ResearchCitation Excerpt :Factor analysis revealed that these five symptom domains loaded onto two separable dimensions, i.e., motivation-pleasure (i.e., amotivation) and emotional expressivity (i.e., DE) (Kirkpatrick et al., 2011; Strauss et al., 2012b). A recent study has applied BNSS in ARMS individuals and demonstrated excellent internal consistency and validity, thereby suggesting the utility of BNSS in evaluating negative symptoms in at-risk populations (Strauss and Chapman, 2017). In the current report, we present a cross-sectional analysis for a group of Chinese individuals with ARMS in Hong Kong with an aim to examine (1) the factor structure of negative symptoms and (2) the potential differential relationships of negative symptom dimensions with functional levels at baseline.