Stuttering
Research on speech therapy for people who stutter, including ecological validity studies, attentional focus, motor learning, and self-rated confidence.
Stuttering research has been the primary driving force behind VR in speech therapy, with studies stretching back two decades. The core question has always been the same: can virtual speaking situations produce genuine communicative responses - the kind that matter for therapy and real-world generalization?
The evidence is clear. Beginning with Brundage and colleagues’ foundational work at George Washington University, researchers have consistently demonstrated that well-designed virtual environments elicit stuttering behavior, anxiety, and physiological responses that closely match those observed in real-world speaking situations. This ecological validity is what makes VR clinically useful - not as a novelty, but as a genuine practice environment.
More recently, researchers have expanded beyond replication studies to explore how VR can be used as a tool for influencing speech production at a motor level, examining attentional focus, speech movement flexibility, and the conditions under which individuals produce more automatic, less monitored speech.
25 Studies
First scoping review of immersive VR in speech-language pathology maps two decades of research
A scoping review in AJSLP synthesized 11 peer-reviewed studies (2007-2025) using immersive VR with people who have communication differences. Across populations, immersive VR elicited communicative and emotional responses comparable to real-world contexts, with consistent presence and engagement findings. Sample sizes ranged from 3 to 36 participants, ages 9-81 years. The review describes the field as still early-stage and disproportionately focused on stuttering (5 of 11 studies).
Pilot RCT in youth who stutter: real-time photorealistic-avatar VR is well-accepted and elicits arousal, but one session did not outperform SLP role-play
A pilot RCT randomized 12 children and adolescents who stutter (ages 9-18) to one of two training conditions before facing an unknown actor-teacher: a conversation with a photorealistic virtual teacher in VR controlled live by their own SLP via facial motion capture (n=6), or face-to-face SLP role-play (n=6). The VR system was well-accepted (high presence, low cybersickness). Skin conductance was elevated from baseline in the VR group; SLP role-play raised self-reported anxiety more. A single session did not outperform role-play on self-efficacy or post-task in vivo anxiety.
Structured Turkish review of VR, mobile apps, telerehab, and AI for stuttering: VR has the strongest evidence of the four, but research remains preliminary
A Turkish-language structured review (also published in English) examining four technology domains for stuttering rehabilitation: virtual reality, mobile applications, telerehabilitation, and artificial intelligence. A six-database literature search (2000-2024) identified 55 studies; 13 met inclusion criteria; six AI-related patents on Google Patents were also surveyed. VR had the strongest evidence base of the four domains, but the authors stop short of clinical recommendations.
External attentional focus in VR promotes more flexible speech movement in adults who stutter
Using Research withVR, this study found that directing attention outward (toward a moving VR target) rather than inward (toward articulators) reduced articulatory rigidity and increased speech rate in adults who stutter.
At-home VR speaking practice reduces stuttering and anxiety
Five adolescents and young adults who stutter used commercial VR headsets at home for one week, completing progressively challenging speaking scenarios. Stuttering frequency dropped nearly in half and heart rate decreased significantly.
VR-based tasks reveal distinct cognitive profiles in stuttering and ADHD
This doctoral thesis (supervised by Prof Peter Howell and Dr Daniela Romano at UCL) used VR-based tasks with EEG and eye tracking to compare attention and executive function across adults who stutter, adults with ADHD, and neurotypical controls. The cognitive profiles were found to be distinct, supporting the paper's central argument that comorbidity between people who stutter and people with ADHD is overstated. Network Models were used as the central analytic method.
Case series (n=3) - at-home VR classroom practice was feasible and lowered heart rate in young people who stutter
Three young people who stutter (ages 9-12) used a portable VR headset at home for two weeks, practicing speaking in a virtual classroom. Two showed reduced stuttering afterward, all showed decreased heart rate, and all reported the experience was fun, realistic, and confidence-building.
VR public speaking tool tracks stress and emotion in real time
Researchers developed 'Speak in Public,' combining VR scenarios with wearable biosensors and speech emotion recognition for people who stutter. Testing with five young people showed every stuttering moment coincided with biosensor-identified stress, and emotion profiles varied meaningfully across scenarios.
Pilot RCT of self-guided smartphone-based VR exposure therapy for social anxiety in people who stutter (null result on primary outcomes)
A pilot RCT (n=25 adults who stutter) of three weekly sessions of self-guided smartphone-based VR exposure therapy versus waitlist. Primary outcomes - social anxiety, fear of negative evaluation, stuttering-related thoughts, and stuttering characteristics - did not differ significantly between groups pre to post. The authors conclude that the current self-guided protocol may not be effective on its own, though scores trended down in both arms.
Scenari-Aid DVD simulation tool well-received by adults who stutter
Thirty-seven adults who stutter used the Scenari-Aid DVD social simulation tool with 25 pre-recorded video scenarios across 7 scenario categories and then completed a survey. Participants overwhelmingly endorsed the tool, with 97-100% positive agreement on anxiety items, 84-97% on fluency items, and 76-97% on therapy/fluency technique value items.
Narrative review of 5 VR-stuttering studies - VR matches live-audience conditions and repeated sessions reduce anxiety
The first VR-stuttering paper in Croatian academic literature. This narrative review synthesized five empirical studies examining VR with adults who stutter. Consistent evidence showed that VR environments produce communication experiences comparable to real-world settings and that repeated VR speaking sessions reduce anxiety. Authors are affiliated with DV Latica Zadar and the University of Zagreb Faculty of Education and Rehabilitation Sciences.
Scoping review of VR exposure therapy for social anxiety and how it could be adapted for stuttering
A scoping review of twelve studies of VR exposure therapy (VRET) for adults with social anxiety, structured to identify design variables (sessions, dose, hardware, environments, audience configurations) relevant to adapting VRET for people who stutter. The review formulates testable design hypotheses rather than empirical conclusions for the stuttering question.
Three-participant feasibility case study of an Arabic-language VR public-speaking system with an automated stuttering-event detector
A three-participant feasibility case study (two female, one male, ages 30-34) of an Arabic-language VR public-speaking system on a Samsung Gear VR + S6 phone, paired with an automated stuttering-event detector. Each participant completed one session reading from a virtual podium facing a virtual audience. Setup time 2-3 minutes; the automated detector correlated R=0.95 with manual clinician counts on the same audio.
In ten children and adolescents who stutter, virtual classrooms produced anxiety and rated stuttering severity comparable to a live audience
Ten school-age children and adolescents who stutter spoke under three conditions: an empty virtual apartment, a virtual classroom (neutral and challenging variants), and a small live audience. Self-reported anxiety and clinician-rated stuttering severity in the virtual classroom did not differ significantly from the live audience, and virtual-classroom anxiety correlated strongly with live-audience anxiety (Spearman rho = 0.92, p < .001).
Stuttering adaptation is stronger in VR than in real-world settings
This study examined whether people who stutter show the expected decline in stuttering across repeated readings in VR compared to real-world settings. Twenty-four adults completed tasks in both environments, and the adaptation effect was actually stronger in VR.
VR self-modeling improved conversational stuttering but had limited effects on prompted speech and anxiety
Three adults who stutter viewed edited 360-degree VR footage of themselves speaking fluently. All showed clinically meaningful reductions in conversational (unprompted) stuttering severity. However, effects on prompted speech were variable and limited treatment effects were found on anxiety data - with one participant's anxiety actually increasing. Data collection took place during the COVID-19 pandemic and period of racial unrest, which the author identifies as a confounding factor.
Eye-tracking VR helps people who stutter improve gaze during conversation
This thesis integrated eye tracking into a VR exposure system to objectively measure gaze behaviors of people who stutter. Across three sessions, participants showed significant reductions in prolonged eye closures and a substantial increase in time spent looking at the avatar's face.
VR audiences raise subjective distress but not physiological arousal or stuttering frequency in adult males who stutter
Ten adult males who stutter delivered impromptu speeches in a virtual audience and an empty virtual room. Subjective distress (SUDS) was significantly higher in the audience condition - but heart rate, skin conductance, and stuttering frequency did NOT differ between conditions, producing a dissociation between subjective and objective markers of distress in this VR setting.
Bachelor's-dissertation pilot of an early Samsung Gear VR public-speaking prototype with 6 adults who stutter - mixed anxiety results across participants
A bachelor's-dissertation conference paper testing a custom Samsung Gear VR public-speaking app with 6 adults who stutter (4 returning for Session 2). Three animated audience characters in a virtual lecture hall; anxiety captured on a 1-5 self-report scale only. Results were mixed across participants - some decreased, some unchanged, some increased anxiety. Body temperature and EDA rose during exposure. Chard & van Zalk's 2022 scoping review explicitly excluded this paper for the absence of a validated social-anxiety outcome and the 'chill session' retreat option.
Stuttering and anxiety responses in virtual audiences closely correspond to those in live audiences
A foundational study in ten adults who stutter showing that stuttering frequency during a challenging virtual audience speech correlated at Spearman rho = 0.99 with stuttering during a live audience speech, and that anticipatory apprehension and confidence measured before the virtual condition correlated strongly with the same measures before the live condition (rho = 0.82 and 0.88 respectively). The neutral virtual audience also correlated with the live condition, but less strongly (rho = 0.82 for stuttering frequency).
Narrative review - telehealth showed stuttering outcomes equivalent to in-person care; VR framed as a promising next step
This narrative review traced how technology - from telehealth to electronic devices and VR - has reshaped clinical practice for people who stutter. It highlighted telehealth trials showing equivalent outcomes to in-person services and discussed VR as an emerging platform for graduated speaking practice.
Master's thesis (n=20): no significant physiological or subjective anxiety differences between adult males who stutter and matched non-stuttering controls during VR speech
A master's thesis: ten adult males who stutter and ten age-matched non-stuttering males each gave two four-minute VR speeches (to a ~30-person virtual audience and to the same empty room). Physiological (GSR, HR, respiration) and subjective (SUDS) measures returned a null between-groups result. The only significant within-group setting effect was on SUDS - both groups rated audience speech as more anxious than empty-room speech.
Video self-modeling improves self-perception after speech restructuring
This trial tested whether adding video self-modeling to standard post-program maintenance would strengthen gains for 89 people who stutter. Objective stuttering frequency did not change, but the video group reported meaningfully lower perceived severity and greater satisfaction at six months.
Three validation studies (n=40) - stuttering behavior, anxiety, and cortisol in VR mirrored real speaking situations
This paper makes the conceptual and empirical case for integrating VR into stuttering assessment and support. It presents three validation studies showing that stuttering behavior, anxiety, and physiological stress in VR are comparable to real-world speaking, positioning VR as a bridge between the therapy room and everyday life.
VR job interviews show interviewer style affects stuttering frequency; %SS in VR correlates strongly with %SS in a clinical SSI-3 interview
Twenty adults who stutter completed virtual job interviews in two conditions (challenging and supportive). %SS was significantly higher in the challenging condition. %SS in both VR conditions correlated strongly with %SS in a separate clinical SSI-3 interview task (r=.90+). The comparison was VR-vs-clinical-interview, NOT VR-vs-real-world job interview - the authors are explicit that real-world comparison was future work.
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