Mark van der Gaag

ORCID: 0000-0002-3525-6415
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About
Contact & Profiles
Research Areas
  • Schizophrenia research and treatment
  • Mental Health and Psychiatry
  • Mental Health Research Topics
  • Psychosomatic Disorders and Their Treatments
  • Mental Health Treatment and Access
  • Psychiatric care and mental health services
  • Child and Adolescent Psychosocial and Emotional Development
  • Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes
  • Bipolar Disorder and Treatment
  • Psychotherapy Techniques and Applications
  • Posttraumatic Stress Disorder Research
  • Personality Disorders and Psychopathology
  • Digital Mental Health Interventions
  • Tryptophan and brain disorders
  • Child Abuse and Trauma
  • Dutch Social and Cultural Studies
  • Obsessive-Compulsive Spectrum Disorders
  • Health Systems, Economic Evaluations, Quality of Life
  • Functional Brain Connectivity Studies
  • Autism Spectrum Disorder Research
  • Mental Health and Patient Involvement
  • Treatment of Major Depression
  • Educational and Psychological Assessments
  • Healthcare Decision-Making and Restraints
  • Family Caregiving in Mental Illness

Parnassia Groep
2016-2025

Vrije Universiteit Amsterdam
2016-2025

Hospital de Basurto
2025

Amsterdam Public Health
2015-2024

University of Amsterdam
2001-2024

Parnassia Groep Academie
2020-2023

Amsterdam UMC Location Vrije Universiteit Amsterdam
2009-2023

KU Leuven
2023

Maastricht University
2023

Maastricht University Medical Centre
2023

This guidance paper from the European Psychiatric Association (EPA) aims to provide evidence-based recommendations on early intervention in clinical high risk (CHR) states of psychosis, assessed according EPA detection. The were derived a meta-analysis current empirical evidence efficacy psychological and pharmacological interventions CHR samples. Eligible studies had investigate conversion rate and/or functioning as treatment outcome patients defined by ultra-high basic symptom criteria....

10.1016/j.eurpsy.2015.01.013 article EN European Psychiatry 2015-03-01

In order to bring about implementation of routine screening for psychosis risk, a brief version the Prodromal Questionnaire (PQ; Loewy et al., 2005) was developed and tested in general help-seeking population. We assessed consecutive patient sample 3533 young adults who were nonpsychotic disorders at secondary mental health services Hague with PQ. performed logistic regression analyses CHi-squared Automatic Interaction Detector decision tree analysis shorten original 92 items. Receiver...

10.1093/schbul/sbs068 article EN Schizophrenia Bulletin 2012-04-19

The efficacy of posttraumatic stress disorder (PTSD) treatments in psychosis has not been examined a randomized clinical trial to our knowledge. Psychosis is an exclusion criterion most PTSD trials.To examine the and safety prolonged exposure (PE) therapy eye movement desensitization reprocessing (EMDR) patients with psychotic disorders comorbid PTSD.A single-blind 3 arms (N = 155), including PE therapy, EMDR waiting list (WL) 13 outpatient mental health services among lifetime current...

10.1001/jamapsychiatry.2014.2637 article EN JAMA Psychiatry 2015-01-21

: Evidence for the effectiveness of treatments subjects at ultrahigh risk (UHR) developing psychosis remains inconclusive.Objective: A new cognitive behavioral intervention specifically targeted biases (ie, Cognitive Behavioral Therapy [CBT] UHR patients plus treatment as usual [TAU] called CBTuhr) is compared with TAU in a group young help-seeking subjects.Methods: total 201 were recruited 4 sites and randomized. In most cases, CBTuhr was an add-on therapy because people seeking help...

10.1093/schbul/sbs105 article EN Schizophrenia Bulletin 2012-09-01

Negative symptoms of schizophrenia are normally grouped into a single category. However, the diversity such suggests that they actually made up more than one dimension. The DSM-V proposes two negative symptom domains, namely expressive deficits and avolition/asociality. We investigated whether do indeed have dimensions. An exploratory factor analysis was carried out based on interviews with PANSS (664 patients). restricted our to items had been described as in previous analyses. structure...

10.1016/j.jpsychires.2013.01.024 article EN publisher-specific-oa Journal of Psychiatric Research 2013-03-13

To investigate the effect of a (minimally) guided peer support group (GPSG) for people with psychosis on social network, support, self-efficacy, self-esteem, and quality life, to evaluate intervention its economic consequences.In multi-center randomized controlled trial 56 patients in 50 control condition, were assessed at baseline after last meeting 8 months.The experimental showed GPSG have positive network compared condition. In high attenders favored over low increased life. Economic...

10.1111/j.1600-0447.2008.01216.x article EN Acta Psychiatrica Scandinavica 2008-06-12

The impact of social environments on mental states is difficult to assess, limiting the understanding which aspects environment contribute onset psychotic symptoms and how individual characteristics moderate this outcome.This study aimed test sensitivity environmental stress as a mechanism psychosis using Virtual Reality (VR) experiments.Fifty-five patients with recent disorder, 20 at ultra high risk for psychosis, 42 siblings 53 controls walked 5 times in virtual bar different levels...

10.1093/schbul/sbw031 article EN Schizophrenia Bulletin 2016-04-02

10.1016/j.jbtep.2011.09.011 article EN Journal of Behavior Therapy and Experimental Psychiatry 2011-09-17

Impaired metacognition is associated with difficulties in the daily functioning of people psychosis. Metacognition can be divided into four domains: Self-Reflection, Understanding Other's Mind, Decentration, and Mastery. This study investigated whether Metacognitive Reflection Insight Therapy (MERIT) used to improve metacognition.This a randomized controlled trial. Patients active condition (n = 35) received forty MERIT sessions, control group treatment as usual. Multilevel...

10.1017/s0033291718000855 article EN Psychological Medicine 2018-04-25
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