Social CommunicationSpeaking Anxiety

Single-blind RCT (n=116) in The Lancet Psychiatry: VR-based CBT for paranoid ideation and social avoidance in psychotic disorders - VR-CBT did not increase social participation but DID reduce paranoid ideation, anxiety, and momentary social threat versus treatment-as-usual waiting-list control

Pot-Kolder RMCA et al. · 2018 · The Lancet Psychiatry · RCT · n = 116 · Outpatients aged 18-65 with psychotic disorder and paranoid ideation · DOI
Evidence certainty: High certainty
How this was rated

Multi-center (7 Dutch mental health centers) single-blind RCT with block randomisation, intention-to-treat analysis, pre-specified primary + secondary outcomes, and 6-month follow-up. Published in The Lancet Psychiatry - one of the highest-impact psychiatry journals globally. n=116 is robust for a clinical RCT in this population. Limitations: single-country (Netherlands) recruitment; psychotic-disorder population is heterogeneous; the primary outcome (social participation) was non-significant which constrains the headline claim. ISRCTN-registered (12929657) though the registration was retrospective.

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A multi-center single-blind RCT at seven Dutch mental health centers. 116 outpatients aged 18-65 with DSM-IV psychotic disorders and paranoid ideation in the past month were randomized (1:1) to VR-based cognitive behavioral therapy (VR-CBT; 16 individual 1-hour sessions added to treatment-as-usual) OR waiting-list control (treatment-as-usual only). Assessments at baseline, post-treatment (3 months), and 6-month follow-up. Primary outcome: social participation (time spent with others, momentary paranoia, perceived social threat, momentary anxiety). Intention-to-treat analysis. VR-CBT did NOT significantly increase social participation, but DID reduce paranoid ideation, anxiety, and momentary social threat - establishing VR-CBT as a credible adjunct for paranoid symptoms in psychosis.

Clinical bottom line

A high-impact (Lancet Psychiatry) multi-center single-blind RCT of VR-based CBT for paranoid ideation and social avoidance in 116 patients with psychotic disorders. VR-CBT did NOT significantly increase social participation (the primary outcome) but DID reduce paranoid ideation, anxiety, and momentary social threat - secondary outcomes that are clinically meaningful in psychosis care. Note: the population (psychotic disorders) is OUTSIDE the typical SLP/communication-disorders scope, but the social-avoidance and social-anxiety treatment targets DO overlap with our Hub's scope. Included as high-quality cross-disciplinary evidence. For SLPs the relevance is primarily conceptual: VR-CBT can address social avoidance even in complex psychiatric populations.

Key findings

  • Multi-center RCT at SEVEN Dutch mental health centers - geographic and clinical diversification within the Netherlands
  • n=116 outpatients aged 18-65 with DSM-IV psychotic disorder AND paranoid ideation in the past month - the eligibility frame targeted patients with social-anxiety-related psychotic symptoms
  • RANDOMISATION 1:1 via block randomisation to VR-CBT + treatment-as-usual (n=58) OR waiting-list + treatment-as-usual (n=58)
  • TREATMENT: 16 individual VR-CBT sessions, each 1 hour long - a substantive treatment dose by VR-CBT standards
  • PRIMARY OUTCOME: social participation, operationalised as time spent with other people, momentary paranoia, perceived social threat, momentary anxiety
  • PRIMARY OUTCOME RESULT: VR-CBT did NOT significantly increase social participation versus control
  • SECONDARY OUTCOMES: VR-CBT significantly REDUCED paranoid ideation, anxiety, and momentary social threat - clinically meaningful in psychosis care even with the non-significant primary outcome
  • Intention-to-treat analysis - the gold standard for RCT integrity
  • Assessments at baseline, post-treatment (3 months), AND 6-month follow-up - durable effects assessment
  • Published in The Lancet Psychiatry - one of the highest-impact psychiatry journals globally
  • ISRCTN registration (12929657) retrospective rather than pre-registered - a methodological caveat

Background

Many patients with psychotic disorders experience persistent paranoid ideation and avoid social situations because of suspiciousness and anxiety. Cognitive-behavioral therapy (CBT) is established as an effective treatment for paranoid ideation, but its delivery for social-avoidance outcomes is constrained by the difficulty of conducting in-vivo exposure with anxious, paranoid patients. Virtual reality offers a controlled exposure modality - but its efficacy specifically in psychotic-disorder populations had not been established in a methodologically rigorous RCT prior to this study.

What they did and found

A multi-center single-blind RCT at seven Dutch mental health centers. 116 outpatients (18-65) with DSM-IV psychotic disorder and paranoid ideation were randomised 1:1 to VR-CBT (16 individual 1-hour sessions + treatment-as-usual) or waiting-list control (treatment-as-usual only). Primary outcome: social participation. Secondary outcomes: paranoid ideation, anxiety, momentary social threat.

Why it matters + Limitations

VR-CBT modifies the cognitive-affective component of social avoidance in psychosis but does not (yet) drive measurable change in actual time spent with others. Limitations: psychotic-disorder population is outside the typical SLP/communication-disorders scope (included here for conceptual cross-disciplinary relevance and high-impact venue quality); ISRCTN registration was retrospective rather than pre-registered; single-country sample; the non-significant primary outcome constrains the headline claim.

Implications for practice

For clinicians thinking about VR-CBT in complex psychiatric populations including psychotic disorders, this is the most rigorous published RCT to date. The pattern (non-significant primary on social participation, significant secondary on paranoid ideation, anxiety, and momentary social threat) suggests VR-CBT modifies the COGNITIVE-AFFECTIVE component of social avoidance more readily than it changes the BEHAVIORAL component (actual time spent with others). For SLPs working with clients who have psychotic-spectrum comorbidities (rare but real - e.g. some clients with selective mutism, severe social-communication impairments with psychotic features), this paper provides cross-disciplinary evidence that VR-CBT can be a meaningful adjunct. For mainstream SLP practice, the relevance is conceptual rather than directly clinical: VR-CBT engages and modifies social-avoidance cognitions even in populations with significant psychiatric complexity.

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Cite this study

If you reference this study in your work, the canonical citation formats are:

APA 7th
Pot-Kolder, R. M. C. A., Geraets, C. N. W., Veling, W., van Beilen, M., Staring, A. B. P., Gijsman, H. J., Delespaul, P. A. E. G., & van der Gaag, M. (2018). Virtual-reality-based cognitive behavioural therapy versus waiting list control for paranoid ideation and social avoidance in patients with psychotic disorders: a single-blind randomised controlled trial. The Lancet Psychiatry. https://doi.org/10.1016/S2215-0366(18)30053-1.
AMA 11th
Pot-Kolder RMCA, Geraets CNW, Veling W, van Beilen M, Staring ABP, Gijsman HJ, Delespaul PAEG, van der Gaag M. Virtual-reality-based cognitive behavioural therapy versus waiting list control for paranoid ideation and social avoidance in patients with psychotic disorders: a single-blind randomised controlled trial. The Lancet Psychiatry. 2018. doi:10.1016/S2215-0366(18)30053-1.
BibTeX
@article{potkolder2018,
  author = {Pot-Kolder, R. M. C. A. and Geraets, C. N. W. and Veling, W. and van Beilen, M. and Staring, A. B. P. and Gijsman, H. J. and Delespaul, P. A. E. G. and van der Gaag, M.},
  title = {Virtual-reality-based cognitive behavioural therapy versus waiting list control for paranoid ideation and social avoidance in patients with psychotic disorders: a single-blind randomised controlled trial},
  journal = {The Lancet Psychiatry},
  year = {2018},
  doi = {10.1016/S2215-0366(18)30053-1},
  url = {https://withvr.app/evidence/studies/pot-kolder-2018}
}
RIS
TY  - JOUR
AU  - Pot-Kolder, R. M. C. A.
AU  - Geraets, C. N. W.
AU  - Veling, W.
AU  - van Beilen, M.
AU  - Staring, A. B. P.
AU  - Gijsman, H. J.
AU  - Delespaul, P. A. E. G.
AU  - van der Gaag, M.
TI  - Virtual-reality-based cognitive behavioural therapy versus waiting list control for paranoid ideation and social avoidance in patients with psychotic disorders: a single-blind randomised controlled trial
JO  - The Lancet Psychiatry
PY  - 2018
DO  - 10.1016/S2215-0366(18)30053-1
UR  - https://withvr.app/evidence/studies/pot-kolder-2018
ER  -

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Funding & independence

Affiliations: lead authors at VU University Amsterdam, University Medical Center Groningen, Altrecht Mental Health Care, Pro Persona Mental Health Care, Maastricht University, and others (seven-center Dutch collaboration). Funding sources reported in the published article. Peer-reviewed in The Lancet Psychiatry (Elsevier - top-tier peer-reviewed psychiatry journal). ISRCTN registered (12929657) retrospectively. No withVR BV involvement. Summary prepared independently by withVR. The VR system used was a custom Dutch research configuration, NOT Therapy withVR or Research withVR.

Last reviewed: 2026-05-17 Next review due: 2027-05-17 Reviewed by: Gareth Walkom