Browsing Vitenskapelige publikasjoner (HV) by Author "Langeveld, Johannes Hendrik"
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Associations between symptom and neurocognitive dimensions in clinical high risk for psychosis
Aase, Ingvild; Langeveld, Johannes Hendrik; Joa, Inge; Johannessen, Jan Olav; Dalen, Ingvild; Hegelstad, Wenche (Peer reviewed; Journal article, 2022)Introduction Clinical high risk for psychosis (CHR) is associated with mild cognitive impairments. Symptoms are clustered into positive, negative and disorganization symptoms. The association between specific symptom ... -
Cognitive predictors of longitudinal positive symptom course in clinical high risk for psychosis
Aase, Ingvild; Langeveld, Johannes Hendrik; Johannessen, Jan Olav; Joa, Inge; Dalen, Ingvild; Hegelstad, Wenche (Peer reviewed; Journal article, 2021)Background Clinical High Risk (CHS) for psychosis is a state in which positive symptoms are predominant but do not reach a level of severity that fulfils the criteria for a psychotic episode. The aim of this study has ... -
Exploring specific predictors of psychosis onset over a 2‐year period: A decision‐tree model
Bjørnestad, Jone Ravndal; Tjora, Tore; Langeveld, Johannes Hendrik; Stain, Helen J.; Joa, Inge; Johannessen, Jan Olav; Friedman‐Yakoobian, Michelle; Hegelstad, Wenche ten Velden (Peer reviewed; Journal article, 2021-05)Aim The fluctuating symptoms of clinical high risk for psychosis hamper conversion prediction models. Exploring specific symptoms using machine-learning has proven fruitful in accommodating this challenge. The aim of this ... -
Psychometric properties of the Inventory of Interpersonal Problems (IIP-C) used with a clinical sample of adolescents: a preliminary study
Israel, Pravin; Langeveld, Johannes Hendrik (Peer reviewed; Journal article, 2021)Background: Interpersonal problems are consistently identified with psychopathology that often has its onset in adolescence. Most of the commonly used instruments in child and adolescent psychiatry target non-interpersonal ... -
Reduced Expression of Emotion: A Red Flag Signalling Conversion to Psychosis in Clinical High Risk for Psychosis (CHR-P) Populations
Bjørnestad, Jone Ravndal; Tjora, Tore; Langeveld, Johannes Hendrik; Joa, Inge; Johannessen, Jan Olav; Friedman‐Yakoobian, Michelle; Hegelstad, Wenche (Peer reviewed; Journal article, 2022-02)Objective: In this hypothesis-testing study, which is based on findings from a previous atheoretical machine-learning study, we test the predictive power of baseline “reduced expression of emotion” for psychosis. Method: ...