The natural history of lifetime psychiatric disorders in patients with obsessive-compulsive disorder followed over half a century.

OBJECTIVE: Few long-term studies have examined the life-time prevalence of comorbid psychiatric conditions in patients with obsessive-compulsive disorder (OCD). We therefore studied the frequency of comorbid psychiatric disorders, and their relation to onset and prognosis, in patients with OCD who were followed for almost half a century. METHODS: During 1947-1953, 285 OCD patients were admitted as inpatients to a university hospital in Gothenburg, Sweden. Among those, 251 (88%) accepted a structured comprehensive psychiatric examination in 1954-1956. In 1989-1993, 176 survivors were eligible and 144 (response rate 82%) were re-examined. The same psychiatrist performed both examinations. OCD was diagnosed according to the Schneider criteria, and other mental disorders according to DSM-IV. Mean follow-up since onset was 47 years. RESULTS: The lifetime frequency of depressive disorders was 84.7% (major depression 43.8%), generalized anxiety disorder (GAD) 71.5%, panic anxiety disorder 47.9%, agoraphobia 52.1%, specific phobias 64.6%, social phobia 47.9%, paranoid conditions 40.3% (29.1% paranoid ideation), psychotic disorders 15.3%, alcohol abuse 13.2% (men 39%, women 3%) and substance abuse 17.4%. Specific phobia most often started before OCD, while depression had a varied onset in relation to OCD. Social phobia, agoraphobia, GAD, alcohol and substance abuse, psychotic disorders and paranoid conditions most often started after OCD. Presence of GAD, psychotic disorder and substance abuse worsened prognosis of OCD. CONCLUSION: Comorbid psychiatric conditions are common in OCD patients, and have onset throughout the course. OCD signals vulnerability for other psychiatric conditions, which are important to detect in clinical practice as they negatively affect the outcome.

Internet-Based Cognitive Behavioral Therapy for Children and Adolescents With Dental or Injection Phobia: Randomized Controlled Trial.

BACKGROUND: Dental phobia (DP) and injection phobia (IP) are common in children and adolescents and are considered some of the biggest obstacles to successful treatment in pediatric dentistry. Cognitive behavioral therapy (CBT) is an evidence-based treatment for anxiety and phobias. As the availability of CBT in dentistry is low, internet-based CBT (ICBT) was developed. Open trials have shown that ICBT is a promising intervention, but randomized trials are lacking. OBJECTIVE: This randomized controlled trial tests whether therapist-guided ICBT supported by a parent could reduce fear, allowing children and adolescents with DP or IP to receive dental treatment. METHODS: We enrolled 33 participants (mean age 11.2, SD 1.9 y) whom a clinical psychologist had diagnosed with DP, IP, or both. After inclusion, participants were randomized to either ICBT (17/33, 52%) or a control group of children on a waitlist (16/33, 48%). ICBT was based on exposure therapy and comprised a 12-week at-home program combined with visits to their regular dental clinic. Participants corresponded weekly with their therapist after completing each module, and 1 parent was designated as a coach to support the child in the assignments during treatment. All participants completed measurements of the outcome variables before treatment start and after 12 weeks (at treatment completion). The measurements included a structured diagnostic interview with a clinical psychologist. Our primary outcome measure was the Picture-Guided Behavioral Avoidance Test (PG-BAT), which assesses the ability to approach 17 dental clinical procedures, and a positive clinical diagnosis. Secondary outcome measures included self-report questionnaires that measured self-efficacy and levels of dental and injection anxiety. The children and their parents completed the questionnaires. RESULTS: All participants underwent the 12-week follow-up. After treatment, 41% (7/17) of the participants in the ICBT group no longer met the diagnostic criteria for DP or IP, whereas all participants in the control group did (P=.004). Repeated-measure ANOVAs showed that ICBT led to greater improvements on the PG-BAT compared with the control group; between-group effect sizes for the Cohen d were 1.6 (P<.001) for the child-rated PG-BAT and 1.0 (P=.009) for the parent-rated PG-BAT. Reductions in our secondary outcomes-dental fear and anxiety (P<.001), negative cognitions (P=.001), and injection fear (P=.011)-as well as improvements in self-efficacy (P<.001), were all significantly greater among children in the ICBT group than in the controls. No participants reported adverse events. CONCLUSIONS: ICBT seems to be an effective treatment for DP and IP in children and adolescents. It reduced fear and anxiety and enabled participants to willingly receive dental treatment. ICBT should be seriously considered in clinical practice to increase accessibility; this therapy may reduce the need for sedation and restraint and lead to better dental health in children and adolescents. TRIAL REGISTRATION: ClinicalTrials.gov NCT02588079; https://clinicaltrials.gov/study/NCT02588079.

Automated mobile virtual reality cognitive behavior therapy for aviophobia in a natural setting: a randomized controlled trial.

BACKGROUND: Access to evidence-based psychological treatment is a challenge worldwide. We assessed the effectiveness of a fully automated aviophobia smartphone app treatment delivered in combination with a $5 virtual reality (VR) viewer. METHODS: In total, 153 participants from the Dutch general population with aviophobia symptoms and smartphone access were randomized in a single-blind randomized controlled trial to either an automated VR cognitive behavior therapy (VR-CBT) app treatment condition (n = 77) or a wait-list control condition (n = 76). The VR-CBT app was delivered over a 6-week period in the participants' natural environment. Online self-report assessments were completed at baseline, post-treatment, at 3-month and at 12-month follow-up. The primary outcome measure was the Flight Anxiety Situations Questionnaire (FAS). Analyses were based on intent-to-treat. RESULTS: A significant reduction of aviophobia symptoms at post-test for the VR-CBT app compared with the control condition [p < 0.001; d = 0. 98 (95% CI 0.65-1.32)] was demonstrated. The dropout rate was 21%. Results were maintained at 3-month follow-up [within-group d = 1.14 (95% CI 0.46-1.81)] and at 12-month follow-up [within-group d = 1.12 (95% CI 0.46-1.79)]. Six participants reported adverse effects of cyber sickness symptoms. CONCLUSIONS: This study is the first to show that fully automated mobile VR-CBT therapy delivered in a natural setting can maintain long-term effectiveness in reducing aviophobia symptoms. In doing so, it offers an accessible and scalable evidence-based treatment solution that can be applied globally at a fraction of the cost of current treatment alternatives.

One session treatment (OST) is equivalent to multi-session cognitive behavioral therapy (CBT) in children with specific phobias (ASPECT): results from a national non-inferiority randomized controlled trial.

BACKGROUND: 5%-10% children and young people (CYP) experience specific phobias that impact daily functioning. Cognitive Behaviour Therapy (CBT) is recommended but has limitations. One Session Treatment (OST), a briefer alternative incorporating CBT principles, has demonstrated efficacy. The Alleviating Specific Phobias Experienced by Children Trial (ASPECT) investigated the non-inferiority of OST compared to multi-session CBT for treating specific phobias in CYP. METHODS: ASPECT was a pragmatic, multi-center, non-inferiority randomized controlled trial in 26 CAMHS sites, three voluntary agency services, and one university-based CYP well-being service. CYP aged 7-16 years with specific phobia were randomized to receive OST or CBT. Clinical non-inferiority and a nested cost-effectiveness evaluation was assessed 6-months post-randomization using the Behavioural Avoidance Task (BAT). Secondary outcome measures included the Anxiety Disorder Interview Schedule, Child Anxiety Impact Scale, Revised Children's Anxiety Depression Scale, goal-based outcome measure, and EQ-5DY and CHU-9D, collected blind at baseline and six-months. RESULTS: 268 CYPs were randomized to OST (n = 134) or CBT (n = 134). Mean BAT scores at 6 months were similar across groups in both intention-to-treat (ITT) and per-protocol (PP) populations (CBT: 7.1 (ITT, n = 76), 7.4 (PP, n = 57), OST: 7.4 (ITT, n = 73), 7.6 (PP, n = 56), on the standardized scale-adjusted mean difference for CBT compared to OST -0.123, 95% CI -0.449 to 0.202 (ITT), mean difference -0.204, 95% CI -0.579 to 0.171 (PP)). These findings were wholly below the standardized non-inferiority limit of 0.4, suggesting that OST is non-inferior to CBT. No between-group differences were found on secondary outcomes. OST marginally decreased mean service use costs and maintained similar mean Quality Adjusted Life Years compared to CBT. CONCLUSIONS: One Session Treatment has similar clinical effectiveness to CBT for specific phobias in CYP and may be a cost-saving alternative.

oVRcome - Self-guided virtual reality for specific phobias: A randomised controlled trial.

OBJECTIVE: Mobile health applications for mental health are widely accessible but most have had limited research evaluation. Virtual reality exposure therapy is an emerging treatment for specific phobias. Most virtual reality studies have investigated high-end virtual reality devices, typically only available in research and limited clinical settings for a single phobia. This study evaluated the effectiveness of oVRcome, a mobile health application combining self-guided virtual reality exposure and cognitive behaviour therapy, for five specific phobias. METHODS: This is a 2-arm 6-week randomised controlled trial, with a waitlist control group and follow-up at week 12. Participants were required to live in New Zealand; be aged 18-64 years; have a fear of flying, heights, spiders, dogs and needles; score above 4 on the Brief Standard Self-rating scale for phobic patients; and have access to a smartphone and Internet. oVRcome consists of six modules of psychoeducation, relaxation, mindfulness, cognitive techniques, exposure through virtual reality and relapse prevention over 6 weeks. The primary outcome was the change from baseline to week 6 on the Severity Measures for Specific Phobia - Adults. All analyses were performed on intention-to-treat set. RESULTS: A total of 126 participants were randomised, and 109 completed the follow-up at week 6, for a retention rate of 86.5%. The mean change in Severity Measures for Specific Phobia - Adults score from baseline to week 6 was greater in the active group compared with the waitlist group (active group -20.53 [standard deviation = 8.24]; waitlist group: - 12.31 [standard deviation = 10.66]; p < 0.001). The effect size for this difference was 0.86. CONCLUSION: Self-guided use of the oVRcome app was effective at reducing severity of specific phobia symptoms in a sample of people with a self-reported fear of flying, heights, spiders, dogs or needles.Trial registry clinicaltrials.gov NCT04909177.

Self-reported fears and mental health in elementary school children across Europe.

Fears are common in the general population and particularly among children. The number of fear subtypes (animals, natural environment, situational, blood-injection-injury or other type) has been shown to be associated with psychopathology. Furthermore, there is evidence suggesting that some subtypes may be more often associated with mental disorders than others. The present study uses data from a large cross sectional survey, the School Children Mental Health in Europe (SCMHE) study, conducted in eight European countries on children ages 6 through 13-years-old attending elementary school (n = 9613). Fear subtypes and self-reported mental health were assessed using the Dominic Interactive (DI), a self-administered computerized image-based questionnaire. The findings show that the number of fear subtypes is strongly associated with self-reported internalizing and externalizing problems. In addition, adjusting for the number of subtypes, fear of animals was less likely than other fears to be associated with psychopathology. The findings support the notion that children who report excessive and generalized fear should be targeted for prevention, consistent with research identifying childhood onset generalized specific phobia as a probable precursor to subsequent psychopathology.

Animal eMotion, or the emotional evaluation of moving animals.

Responding adequately to the behaviour of human and non-human animals in our environment has been crucial for our survival. This is also reflected in our exceptional capacity to detect and interpret biological motion signals. However, even though our emotions have specifically emerged as automatic adaptive responses to such vital stimuli, few studies investigated the influence of biological motion on emotional evaluations. Here, we test how the motion of animals affects emotional judgements by contrasting static animal images and videos. We investigated this question (1) in non-fearful observers across many different animals, and (2) in observers afraid of particular animals across four types of animals, including the feared ones. In line with previous studies, we find an idiosyncratic pattern of evoked emotions across different types of animals. These emotions can be explained to different extents by regression models based on relevant predictor variables (e.g. familiarity, dangerousness). Additionally, our findings show a boosting effect of motion on emotional evaluations across all animals, with an additional increase in (negative) emotions for moving feared animals (except snakes). We discuss implications of our results for experimental and clinical research and applications, highlighting the importance of experiments with dynamic and ecologically valid stimuli.

Anxiety sensitivity, disgust sensitivity and aversive reactions to four stimuli.

BACKGROUND: Prior theory and research has implicated disgust as relevant to some, but not all phobias. AIMS: The current study examined whether anxiety sensitivity is more relevant to certain specific phobias and whether disgust sensitivity is more relevant to other specific phobias. METHOD: Participants (n = 201) completed measures of anxiety sensitivity, disgust sensitivity and measures of aversive reactions in the presence of two fear-relevant stimuli (i.e. heights and small, enclosed spaces) and two disgust-relevant stimuli (i.e. spiders and blood/injury). RESULTS: Results of multiple linear regression analyses revealed that disgust sensitivity showed significant associations with aversive reactions in all four stimulus domains after controlling for anxiety sensitivity. After controlling for disgust sensitivity, anxiety sensitivity showed associations with the two fear-relevant phobias but not with the two disgust-relevant phobias included in this study. Anxiety sensitivity also showed an association with variance specific to one of the two fear-relevant specific phobias included in the study. Disgust sensitivity also showed associations with variance specific to both of the disgust-relevant phobias included in the study but not with variance specific to either of the fear-relevant specific phobias. CONCLUSIONS: These results provide evidence that the distinction between fear-relevant and disgust-relevant specific phobias is meaningful and also implicate disgust sensitivity as relevant to aversive reactions to all stimuli included in this study.

The Role of the Oxytocin System in Anxiety Disorders.

Oxytocin, a neuropeptide synthesized by the hypothalamus, plays a central role in human social behavior, social cognition, anxiety, mood, stress modulation, and fear learning and extinction. The relationships between oxytocin and psychiatric disorders including depression, anxiety, schizophrenia, and autism spectrum disorder have been extensively studied. In this chapter, we focus on the current knowledge about oxytocin and anxiety disorder. We discuss the anxiolytic effects of oxytocin in preclinical and clinical findings, possible related neurobehavioral mechanisms (social cognition, fear learning, and extinction), related neurotransmitter and neuroendocrine systems (hypothalamus-pituitary-adrenal axis, serotoninergic, and GABAergic systems), and studies regarding plasma levels of oxytocin, genetic and epigenetic findings, and effects of intranasal oxytocin in DSM-5 anxiety disorder (primarily social anxiety disorder and separation anxiety disorder) patients.

Disgust and fear: common emotions between eating and phobic disorders.

Eating disorders (ED) are prevalent mental illnesses composed mainly of anorexia nervosa, bulimia nervosa and binge eating disorders. Anxiety disorders are another set of mental illnesses, with phobic disorder (PD) being the most prevalent disorder. ED and PD are highly comorbid. The aim of this study is to assess, in 131 individuals attending an outpatient clinic for different health issues, the level of fear related to situations generating avoidance such as in social anxiety and specific phobias according to the fear questionnaire (FQ), the level of disgust according to the disgust scale (DS-R) and the vulnerability towards ED according to the SCOFF scale to demonstrate that high levels of both fear and disgust increase the vulnerability towards ED. The study demonstrated that the level of disgust increased when fear increases (r = 0.377, p < 0.001 for the first part of the FQ; r = 0.225, p = 0.01 for the second part of the FQ). Moreover, individuals with vulnerability towards having an ED presented a higher level of disgust than individuals without this vulnerability (p = 0.009). Furthermore, individuals with vulnerability towards ED have a higher level of anxiety related to PD subtypes (p = 0.008 for agoraphobia; p = 0.001 for injection/blood phobia) as well as to social anxiety (p = 0.01), independently from having a depressive or another anxiety disorder. In the multivariate analysis, a history of psychiatric consultation has been the only significantly different parameter between individuals with or without vulnerability towards ED (p = 0.0439). Accordingly, fear and disgust are negative emotions that seem to be clinically associated which better explains the comorbidity of ED with PD. LEVEL OF EVIDENCE: Level III. Evidence obtained from well-designed cohort or case-control analytic studies, preferably from more than one center or research group.

Childhood generalized specific phobia as an early marker of internalizing psychopathology across the lifespan: results from the World Mental Health Surveys.

BACKGROUND: Specific phobia (SP) is a relatively common disorder associated with high levels of psychiatric comorbidity. Because of its early onset, SP may be a useful early marker of internalizing psychopathology, especially if generalized to multiple situations. This study aimed to evaluate the association of childhood generalized SP with comorbid internalizing disorders. METHODS: We conducted retrospective analyses of the cross-sectional population-based World Mental Health Surveys using the Composite International Diagnostic Interview. Outcomes were lifetime prevalence, age of onset, and persistence of internalizing disorders; past-month disability; lifetime suicidality; and 12-month serious mental illness. Logistic and linear regressions were used to assess the association of these outcomes with the number of subtypes of childhood-onset (< 13 years) SP. RESULTS: Among 123,628 respondents from 25 countries, retrospectively reported prevalence of childhood SP was 5.9%, 56% of whom reported one, 25% two, 10% three, and 8% four or more subtypes. Lifetime prevalence of internalizing disorders increased from 18.2% among those without childhood SP to 46.3% among those with one and 75.6% those with 4+ subtypes (OR = 2.4, 95% CI 2.3-2.5, p < 0.001). Twelve-month persistence of lifetime internalizing comorbidity at interview increased from 47.9% among those without childhood SP to 59.0% and 79.1% among those with 1 and 4+ subtypes (OR = 1.4, 95% CI 1.4-1.5, p < 0.001). Respondents with 4+ subtypes also reported significantly more disability (3.5 days out of role in the past month) than those without childhood SP (1.1 days) or with only 1 subtype (1.8 days) (B = 0.56, SE 0.06, p < 0.001) and a much higher rate of lifetime suicide attempts (16.8%) than those without childhood SP (2.0%) or with only 1 subtype (6.5%) (OR = 1.7, 95% CI 1.7-1.8, p < 0.001). CONCLUSIONS: This large international study shows that childhood-onset generalized SP is related to adverse outcomes in the internalizing domain throughout the life course. Comorbidity, persistence, and severity of internalizing disorders all increased with the number of childhood SP subtypes. Although our study cannot establish whether SP is causally associated with these poor outcomes or whether other factors, such as a shared underlying vulnerability, explain the association, our findings clearly show that childhood generalized SP identifies an important target group for early intervention.

Explaining the association between anxiety disorders and alcohol use disorder: A twin study.

BACKGROUND: It is unknown whether social anxiety disorder (SAD) has a unique association with alcohol use disorder (AUD) over and beyond that of other anxiety disorders, how the associations develop over time, and whether the associations are likely to be causal. METHODS: Diagnoses of AUD, SAD, generalized anxiety disorder, panic disorder, agoraphobia, and specific phobias were assessed twice using the Composite International Diagnostic Interview among 2,801 adult Norwegian twins. The data were analyzed using logistic regression analyses and multivariate biometric structural equation modeling. RESULTS: SAD had the strongest association with AUD, and SAD predicted AUD over and above the effect of other anxiety disorders. In addition, SAD was prospectively associated with AUD, whereas other anxiety disorders were not. AUD was associated with a slightly elevated risk of later anxiety disorders other than SAD. Biometric modeling favored a model where SAD influenced AUD compared to models where the relationship was reversed or due to correlated risk factors. Positive associations between AUD and other anxiety disorders were fully explained by shared genetic risk factors. CONCLUSIONS: Unlike other anxiety disorders, SAD plausibly has a direct effect on AUD. Interventions aimed at prevention or treatment of SAD may have an additional beneficial effect of preventing AUD, whereas interventions aimed at other anxiety disorders are unlikely to have a similar sequential effect on AUD.

Play-Modified One-Session Treatment for Young Children with a Specific Phobia of Dogs: A Multiple Baseline Case Series.

The one-session treatment (OST) approach for SPs is deemed well-established, and has been found to be highly effective for older children and adults; however, has not yet been trialled with very young children. The present study examines the preliminary effectiveness of play-modified OST for young children with a SP of dogs, using a multiple baseline controlled case series design. Treatment involved play modified one-session of intensive cognitive-behavioural therapy (OST plus Play) which was followed by brief telephone delivered maintenance calls over the 3 weeks immediately following treatment. Four young children (4 years of age) participated and symptoms were assessed at pre-treatment, across a 1-3 week baseline phase, immediately following the OST plus Play, and at 1 and 3 months follow-up. Visual inspection provided evidence for stability of symptoms across the baseline phase, followed by reductions in symptoms over the course of treatment and follow-up. Non-parametric analyses offered further support, with significant improvements in following the intensive OST plus Play intervention.

Treatment of Storm Fears Using Virtual Reality and Progressive Muscle Relaxation.

BACKGROUND: The present study examined the efficacy of virtual reality (VR) exposure therapy for treating individuals with storm fears by comparing a one-session VR exposure treatment with a one-session progressive muscle relaxation (PMR) and psychoeducation session. AIMS: It was predicted that there would be a reduction in storm-related fear post-treatment for individuals in both conditions, but that this reduction would be greater for those in the VR exposure condition. It was predicted that improvements would be maintained at 30-day follow-up only for those in the VR exposure condition. METHOD: Thirty-six participants each received one of the two treatment conditions. Those in the PMR treatment group received approximately 30 minutes of PMR and approximately 15 minutes of psychoeducation regarding storms. Those in the VR treatment group received approximately 1 hour of VR exposure. Additionally, participants were asked to complete a pre-treatment and post-treatment 5-minute behavioural approach test to assess changes in storm fears. They were also asked to complete a measure assessing storm phobia. RESULTS: There was a significant interaction between treatment group and self-reported fear at post-treatment, such that fear decreased for both groups, although the reduction was stronger in the VR group. Results also showed that reductions in storm fear were maintained at 30-day follow-up for both groups. CONCLUSIONS: Although this study used a small non-clinical sample, these results offer preliminary support for the use of VR exposure therapy in the treatment of storm-related fear.

Virtual Reality Exposure Therapy for the Treatment of Dental Phobia: A Controlled Feasibility Study.

BACKGROUND: Virtual reality exposure therapy (VRET) has been used to treat a variety of fears and phobias. AIM: To determine the feasibility (i.e. safety and efficacy) of using VRET to treat dental phobia. METHOD: Safety was evaluated by determining any adverse events or symptom exacerbation. Efficacy of VRET was evaluated by comparing the reduction in dental anxiety scores (measured 16 times within a 14-week study period, and at 6-month follow-up), and its behavioural effects with that of an informational pamphlet (IP) on ten randomized patients with dental phobia using a controlled multiple baseline design. Participants' heart rate response during VRET, and their experience post-VRET, were indexed. RESULTS: No personal adverse events or symptom exacerbation occurred. Visual analysis and post-hoc intention-to-treat analysis showed a significantly greater decrease in dental anxiety scores [higher PND (percentage of non-overlap data) scores of 100% and lower POD (percentage of overlap data) of 0%, Modified Dental Anxiety Scale, F (1,8) = 8.61, p = 0.019, and Dental Fear Scale, F (1,8) = 10.53, p = 0.012], and behavioural avoidance in the VRET compared with the IP group [d = 4.2 and -1.4, respectively). There was no increase in average heart rate during VRET. Of the nine treatment completers, six (four from the VRET group and two from the IP group) no longer had dental phobia at 6-month follow-up. Four of the five VRET participants, but none of the IP participants, scheduled a dental treatment appointment following the intervention. CONCLUSION: VRET is a feasible alternative for patients with dental phobia.

The Association Between Dental Anxiety And Psychiatric Disorders And Symptoms: A Systematic Review.

BACKGROUND: A growing amount of evidence suggests that dental anxiety is associated with other psychiatric disorders and symptoms. A systematic review was conducted to critically evaluate the studies of comorbidity of dental anxiety with other specific phobias and other Axis I psychiatric disorders. OBJECTIVE: The aim of the review was to explore how dental anxiety is associated with other psychiatric disorders and to estimate the level of comorbid symptoms in dental anxiety patients. METHODS: The review was conducted and reported in accordance with the MOOSE statement. Data sources included PubMed, PsycInfo, Web of Science and Scopus. RESULTS: The search produced 631 hits, of which 16 unique records fulfilled the inclusion criteria. The number of eligible papers was low. Study populations were heterogeneous including 6,486 participants, and a total of 25 tests and in few cases clinical interviews were used in the evaluation processes. The results enhanced the idea about the comorbidity between dental anxiety and other psychiatric disorders. The effect was found strong in several studies. CONCLUSION: Patients with a high level of dental anxiety are more prone to have a high level of comorbid phobias, depression, mood disorders and other psychiatric disorders and symptoms.

The cross-national epidemiology of specific phobia in the World Mental Health Surveys.

BACKGROUND: Although specific phobia is highly prevalent, associated with impairment, and an important risk factor for the development of other mental disorders, cross-national epidemiological data are scarce, especially from low- and middle-income countries. This paper presents epidemiological data from 22 low-, lower-middle-, upper-middle- and high-income countries. METHOD: Data came from 25 representative population-based surveys conducted in 22 countries (2001-2011) as part of the World Health Organization World Mental Health Surveys initiative (n = 124 902). The presence of specific phobia as defined by the Diagnostic and Statistical Manual of Mental Disorders, fourth edition was evaluated using the World Health Organization Composite International Diagnostic Interview. RESULTS: The cross-national lifetime and 12-month prevalence rates of specific phobia were, respectively, 7.4% and 5.5%, being higher in females (9.8 and 7.7%) than in males (4.9% and 3.3%) and higher in high- and higher-middle-income countries than in low-/lower-middle-income countries. The median age of onset was young (8 years). Of the 12-month patients, 18.7% reported severe role impairment (13.3-21.9% across income groups) and 23.1% reported any treatment (9.6-30.1% across income groups). Lifetime co-morbidity was observed in 60.5% of those with lifetime specific phobia, with the onset of specific phobia preceding the other disorder in most cases (72.6%). Interestingly, rates of impairment, treatment use and co-morbidity increased with the number of fear subtypes. CONCLUSIONS: Specific phobia is common and associated with impairment in a considerable percentage of cases. Importantly, specific phobia often precedes the onset of other mental disorders, making it a possible early-life indicator of psychopathology vulnerability.

Transdiagnostic brain responses to disorder-related threat across four psychiatric disorders.

BACKGROUND: There is an ongoing debate whether transdiagnostic neural mechanisms are shared by different anxiety-related disorders or whether different disorders show distinct neural correlates. To investigate this issue, studies controlling for design and stimuli across multiple anxiety-related disorders are needed. METHOD: The present functional magnetic resonance imaging study investigated neural correlates of visual disorder-related threat processing across unmedicated patients suffering from panic disorder (n = 20), social anxiety disorder (n = 20), dental phobia (n = 16) and post-traumatic stress disorder (n = 11) relative to healthy controls (HC; n = 67). Each patient group and the corresponding HC group saw a tailor-made picture set with 50 disorder-related and 50 neutral scenes. RESULTS: Across all patients, increased activation to disorder-related v. neutral scenes was found in subregions of the bilateral amygdala. In addition, activation of the lateral amygdala to disorder-related v. neutral scenes correlated positively with subjective anxiety ratings of scenes across patients. Furthermore, whole-brain analysis revealed increased responses to disorder-related threat across the four disorders in middle, medial and superior frontal regions, (para-)limbic regions, such as the insula and thalamus, as well as in the brainstem and occipital lobe. We found no disorder-specific brain responses. CONCLUSIONS: The results suggest that pathologically heightened lateral amygdala activation is linked to experienced anxiety across anxiety disorders and trauma- and stressor-related disorders. Furthermore, the transdiagnostically shared activation network points to a common neural basis of abnormal responses to disorder-related threat stimuli across the four investigated disorders.

Do traumatic events have more impact on the development of dental anxiety than negative, non-traumatic events?

The importance of exposure to traumatic events for the development of dental anxiety has not been investigated. The aim of the present study was to test the hypotheses that individuals who reported having been exposed to a traumatic event [that is, fulfilling Criterion A of the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5), for post-traumatic stress disorder (PTSD)] as the cause of their dental anxiety would report significantly higher levels of dental anxiety, typical trauma-related (PTSD) symptoms, and greater disturbance of memories involving these events than those who reported being exposed to non-traumatic events. Patients of a specialized dental fear clinic (n = 90) were divided into those who reported a traumatic event that initiated their dental trait anxiety and those who did not. The two groups did not differ in their severity of dental anxiety and number of PTSD symptoms, but the memories of those who had been exposed to traumatic events were significantly more vivid than the memories of those in the reference group. Length of time since the event took place did not play a role. Hence, traumatic events are remembered more vividly, but do not seem to initiate more severe forms of dental anxiety than other events.

Arachnophobia alleviated by subthalamic nucleus stimulation for Parkinson's disease.

We report on a Parkinson patient with motor fluctuations and dyskinesias in whom deep brain stimulation (DBS) of the subthalamic nucleus (STN) not only improved motor symptoms but also pre-existing arachnophobia. Arachnophobia had been unchanged by the course of Parkinson's disease but rapidly improved with STN-DBS. Both, motor effects and the improvement of arachnophobia were stable during 2 years follow-up. To our knowledge this is the first report on STN stimulation effects on a specific phobia.