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Edited by
David Kingdon, University of Southampton,Paul Rowlands, Derbyshire Healthcare NHS foundation Trust,George Stein, Emeritus of the Princess Royal University Hospital
Patients with bodily distress, hypochondriasis and chronic pain experience symptoms that impair their functioning and cause them significant degrees of discomfort. They also represent a significant public health challenge. Problems in classification/nosology continue to bedevil this area, and these difficulties – along with the use of the language of psychiatric classification, which most patients find unacceptable – continue to led to the DSM/ICD terms being little used in day-to-day clinical practice, including liaison psychiatry. Biological, psychological and social factors are relevant to both the aetiology and the maintenance of these syndromes, as well as to their treatment. In recent years, a variety of effective biological and psychosocial approaches to treatment have been developed, and these patients can now be considered as a group for whom medical and psychological approaches should be offered.
One of the negative consequences of the COVID-19 pandemic may be an increase in somatization.
Objectives
identification of implicit characteristics of texts indicating the peculiarities of the opinion about the pandemic by people with high somatization level.
Methods
Survey (03/23/2020–01/29/2021, N=1188). Used: SCL-90-R, COPE, Constructive Thinking Inventory (CTI). It was offered to express an opinion on the pandemic. The statements were divided into the two text arrays - “high somatization” and “low somatization” (based on the parameter “somatization” SCL-90R). The frequency of words in these text arrays was estimated (LIWC).
Results
The analysis showed an increase in somatization as the pandemic developed (Std.J-T Statistic=4,327). The relationship between somatization and anxiety, sleep disturbances, and depression was revealed. Higher rates of somatization are associated with a decrease in emotional coping, «global constructive thinking» and «personal superstitious thinking», an increase in «categorical thinking». The connection between somatization and a number of non-constructive copings is shown. Texts associated with high somatization demonstrate higher number of pronouns of the first person (30.77%, 17.19%), a decrease in the tonality of words, a vocabulary (LIWC) of suffering, negative sthenic emotions (1,53%, 0,93%), a decrease in the vocabulary of motivation and resistance (0,93%, 1,49%), a decrease in vocabulary associated with the body (0,20%, 0,32%).
Conclusions
The connection between somatization and high emotional distress, which manifests itself in negative emotional vocabulary and is associated with a low level of emotional coping, is shown. The “representation” of the pandemic, presented in the text, is “divorced” from somatic manifestations, fear of illness and death.
Some research suggests that mental health problems can be brought on by the stress of having unexplained symptom. In non-western cultures especially, psychological distress is often communicated through multiple somatic complaints. The biopsychosocial model takes into consideration all factors affecting health and disease, supporting the integration of biological, psychological and social factors in the assessment and treatment.
Objectives
In our study we assess prevalence of alexithymia as a potential psychopathological attribute manifesting as unexplained somatic symptoms
Methods
196 patients aged 18 to 60 with unexplained physical symptoms for at least three months, after collection of demographic data, medical and psychiatric history, were subject to Arabic version of the following scales : patient health questionnaire PHQ-15 to assess severity of somatic symptoms, patient health questionnaire PHQ-9 to assess depressive symptoms, generalized anaxiety disorder GAD-7 to assess general anxiety disorder symptoms and Toronto Alexithymia scale TAS to assess alexithymia
Results
90% of ours ample were female patients, 49,5% showed alexithymia, 27,6% were borderline alexithymic and 23% had no alexithymia. Patients with unexplained physical symptoms showed moderate to high depressive symptoms in 81,1% of the sample, moderate to severe anxiety symptoms in 73,5%. Severity of somatic symptoms as assessed by PHQ-15 were significantly highly correlated to scores for Alexithymia (TAS), depressive symptoms (PHQ-9) and anxiety symptoms (GAD-7) p<0,001
Conclusions
Alexithymia is prevalent among patients with unexplained physical symptoms. This later population has high prevalence of depressive and anxiety symptoms that go with the severity of somatic manifestations
Emotional disorders are highly prevalent in primary care. We aimed to determine whether a transdiagnostic psychological therapy plus treatment-as-usual (TAU) is more efficacious than TAU alone in primary care adult patients.
Methods
A randomized, two-arm, single-blind clinical trial was conducted in 22 primary care centres in Spain. A total of 1061 adult patients with emotional disorders were enrolled. The transdiagnostic protocol (n = 527) consisted of seven 90-min sessions (8–10 patients) delivered over a 12–14-week period. TAU (n = 534) consisted of regular consultations with a general practitioner. Primary outcome measures were self-reported symptoms of anxiety, depression, and somatizations. Secondary outcome measures were functioning and quality of life. Patients were assessed at baseline, post-treatment, and at 3, 6, and 12 months. Intention-to-treat and per-protocol analyses were performed.
Results
Post-treatment primary outcomes were significantly better in the transdiagnostic group compared to TAU (anxiety: p < 0.001; Morris's d = −0.65; depression: p < 0.001; d = −0.58, and somatic symptoms: p < 0.001; d = −0.40). These effects were sustained at the 12-month follow-up (anxiety: p < 0.001; d = −0.44; depression: p < 0.001; d = −0.36 and somatic symptoms: p < 0.001; d = −0.32). The transdiagnostic group also had significantly better outcomes on functioning (d = 0.16–0.33) and quality of life domains (d = 0.24–0.42), with sustained improvement at the 12-month follow-up in functioning (d = 0.25–0.39) and quality of life (d = 0.58–0.72). Reliable recovery rates showed large between-group effect sizes (d > 0.80) in favour of the transdiagnostic group after treatment and at the 12-month follow-up.
Conclusions
Adding a brief transdiagnostic psychological intervention to TAU may significantly improve outcomes in emotional disorders treated in primary care.
Empirical studies on the clinical characteristics of older persons with medically unexplained symptoms are limited to uncontrolled pilot studies. Therefore, we aim to examine the psychiatric characteristics of older patients with medically unexplained symptoms (MUS) compared to older patients with medically explained symptoms (MES), also across healthcare settings.
Methods.
A case–control study including 118 older patients with MUS and 154 older patients with MES. To include patients with various developmental and severity stages, patients with MUS were recruited in the community (n = 12), primary care (n = 77), and specialized healthcare (n = 29). Psychopathology was assessed according to Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM-IV-TR) criteria (Mini-International Neuropsychiatric Interview) and by dimensional measures (e.g., psychological distress, hypochondriasis, and depressive symptoms).
Results.
A total of 69/118 (58.5%) patients with MUS met the criteria for a somatoform disorder according to DSM-IV-TR criteria, with the highest proportion among patients recruited in specialized healthcare settings (p = 0.008). Patients with MUS had a higher level of psychological distress and hypochondriasis compared to patients with MES. Although psychiatric disorders (beyond somatoform disorders) were more frequently found among patients with MUS compared to patients with MES (42.4 vs. 24.8%, p = 0.008), this difference disappeared when adjusted for age, sex, and level of education (odds ratio = 1.7 [95% confidence interval: 1.0–3.0], p = 0.070).
Conclusions.
Although psychological distress is significantly higher among older patients with MUS compared to those with MES, psychiatric comorbidity rates hardly differ between both patient groups. Therefore, treatment of MUS in later life should primarily focus on reducing psychological distress, irrespective of the healthcare setting patients are treated in.
The World Health Organization (WHO) Somatoform Disorders Schedule (SDS) is a highly standardized instrument for the assessment of somatoform disorders according to the tenth revision of the International Classification of Diseases (ICD-10) and the fourth edition of the Diagnostic and Statistical Manual (DSM-IV). The SDS was produced in the framework of the WHO International Study of Somatoform Disorders and tested for its reliability in Brazil, India, Italy, the USA and Zimbabwe. A sample of 180 patients from general psychiatry, primary care and general medical settings were interviewed with the SDS within a three-day interval by nonclinician and clinician interviewers. The agreement between the two interviews was tested using the intraclass correlation coefficients (ICC) and kappa statistic. The test-retest reliability of the SDS was found to be very good (the ICC for all the centres was 0.76; overall kappa value for SDS questions was 0.58; one-third of SDS questions had a kappa value of 0.60 or higher). The field test results of the SDS indicated that the instrument may be administered in larger studies by non-clinician interviewers without compromising the ability to document the prevalence of somatoform disorders in different cultures.
There is insufficient knowledge of the long-term course of panic disorder (PD).
Aim
To determine the long-term course and prognostic variables in patients diagnosed with PD.
Methods
Patients who were diagnosed of anxiety states between 1950 and 1961, were examined using a structured clinical interview (SCID-DSM-III-R) between 1984 and 1988 (n = 144). A re-examination was performed in the period 1997–2001 (N = 125). Mean length of follow-up from onset was 47 years.
Results
PD tends to be chronic. Among those who recovered, 93% had done so already by the 1980s. Lack of regular treatment compliance, progression to agoraphobia and number of episodes of panic disorder were associated with worse outcome. Agoraphobia without panic attacks and somatization symptoms were the most prevalent clinical status at follow-up.
Conclusion
After several decades, participants improve with regard to number of panic attacks, though most continue to have residual symptoms.
The purpose of this study was to examine characteristics of Yugoslav patients with neurasthenia diagnosed according to the ICD-10 Diagnostic Criteria for Research (ICD-10-DCR), and to examine the ICD-10-DCR symptoms of neurasthenia and applicability of the corresponding diagnostic criteria to Yugoslav patients with this condition. Thirty-four patients with the ICD-10-DCR neurasthenia and 31 patients with mixed anxiety and depressive disorder were compared in terms of demographic variables, results of several questionnaires, symptom profiles and comorbidity with other mental disorders. Patients with neurasthenia were less educated and more often held jobs as unskilled and semiskilled workers; they had a more chronic course of illness, tended to report more symptoms, manifested more hostility, somatization and hypochondriacal tendencies and received a comorbid diagnosis of hypochondriasis more frequently. In addition to exhaustion and weakness, the most prominent features of neurasthenia were irritability, anger, nervousness, various somatic symptoms and tension. An ICD-10-DCR diagnosis of neurasthenia could not be made in slightly over one-third of patients who would have otherwise met criteria for this diagnosis because of the imposed diagnostic hierarchy, ie, due to current comorbidity with affective disorders and generalized anxiety disorder in such patients. It is concluded that the ICD-10-DCR concept of neurasthenia is generally suitable for Yugoslav patients, except for the diagnostic hierarchy requirement. The diagnostic criteria therefore require revision in order to reflect more accurately the variability in clinical presentation of neurasthenia in different countries.
Mood disorders are managed predominantly in primary care. However, general practitioners’ (GPs) ability to detect and diagnose patients with mood disorders is still considered unsatisfactory. The aim of the present study was to identify predictors for the early recognition of depressive disorder (DD) and bipolar disorder (BD) in general practice.
Methods
A cohort of 1,144,622 patients (605,285 women, 539,337 men) was investigated, using the Health Search IMS Health Longitudinal Patient Database. Predictors of DD or BD were identified at baseline encompassing somatization-related features, lifestyle variables, medical and psychiatric comorbidities. Patients were followed up as long as the following events occurred: diagnoses of DD or BD, death, end of the registration with the GP, end of the study period.
Results
We found an incidence rate of DD or BD of 53.61 and 1.5 per 10,000 person-years, respectively. For both the conditions, the incidence rate grew with age. Most of the lifestyle variables and medical comorbidities increased the risk of mood disorders. The strongest effect was found for migraine/headache (HR [95% CI] = 1.32 [1.26–1.38]), fatigue (1.32 [1.25–1.39]) irritable bowel syndrome (1.15 [1.08-1.23]), and pelvic inflammation disease (1.28 [1.18–1.38]).
Conclusions
Several predictors, in particular somatic symptoms, could be interpreted as an early sign of a mood disorder, and represent a valid indication for the GPs diagnostic process of mental disorders.
Somatization is a common phenomenon that can severely complicate youths’ functioning and health. The burden of somatization on pediatric acute care settings is currently unclear; better understanding it may address challenges clinicians experience in effectively caring for somatizing patients. In this study, we estimate the prevalence of somatization in a pediatric emergency department (ED).
Methods
We conducted a retrospective cross-sectional study of visits for non-critical, non-mental health-related concerns (n = 150) to a quaternary-level pediatric ED between July 2016 and August 2017. Demographic and clinical visit details were collected through chart review and used by two reviewing clinicians to classify whether each visit had a “probable,” “unclear” (possible), or “unlikely” somatizing component.
Results
Approximately 3.33% (n = 5) of youth displayed probable somatization, and an additional 13.33% (n = 20) possibly experienced a somatizing component but require additional psychosocial and visit documentation to be certain. Longer symptom duration and multiple negative diagnostic tests were associated with a higher likelihood of either probable or possible somatization.
Conclusions
A considerable proportion of non-mental health-related visits may involve a somatizing component, indicating the burden of mental health concerns on the ED may be underestimated. A higher index of suspicion for the possibility of somatization may support clinicians in managing somatizing patients.
Functional neurological disorder (FND) is a condition at the intersection of neurology and psychiatry. Individuals with FND exhibit corticolimbic abnormalities, yet little is known about the role of white matter tracts in the pathophysiology of FND. This study characterized between-group differences in microstructural integrity, and correlated fiber bundle integrity with symptom severity, physical disability, and illness duration.
Methods
A diffusion tensor imaging (DTI) study was performed in 32 patients with mixed FND compared to 36 healthy controls. Diffusion-weighted magnetic resonance images were collected along with patient-reported symptom severity, physical disability (Short Form Health Survey-36), and illness duration data. Weighted-degree and link-level graph theory and probabilistic tractography analyses characterized fractional anisotropy (FA) values across cortico-subcortical connections. Results were corrected for multiple comparisons.
Results
Compared to controls, FND patients showed reduced FA in the stria terminalis/fornix, medial forebrain bundle, extreme capsule, uncinate fasciculus, cingulum bundle, corpus callosum, and striatal-postcentral gyrus projections. Except for the stria terminalis/fornix, these differences remained significant adjusting for depression and anxiety. In within-group analyses, physical disability inversely correlated with stria terminalis/fornix and medial forebrain bundle FA values; illness duration negatively correlated with stria terminalis/fornix white matter integrity. A FND symptom severity composite score did not correlate with FA in patients.
Conclusions
In this first DTI study of mixed FND, microstructural differences were observed in limbic and associative tracts implicated in salience, defensive behaviors, and emotion regulation. These findings advance our understanding of neurocircuit pathways in the pathophysiology of FND.
Somatization is known to be more prevalent in Asian than in Western populations. Using a South Korean adolescent and young adult twin sample (N = 1754; 367 monozygotic male, 173 dizygotic male, 681 monozygotic female, 274 dizygotic female and 259 opposite-sex dizygotic twins), the present study aimed to estimate heritability of somatization and to determine common genetic and environmental influences on somatization and hwabyung (HB: anger syndrome). Twins completed self-report questionnaires of the HB symptoms scale and the somatization scale via a telephone interview. The results of the general sex-limitation model showed that 43% (95% CI [36, 50]) of the total variance of somatization was attributable to additive genetic factors, with the remaining variance, 57% (95% CI [50, 64]), being due to individual-specific environmental influences, including measurement error. These estimates were not significantly different between the two sexes. The phenotypic correlation between HB and somatization was .53 (p < .001). The bivariate model-fitting analyses revealed that the genetic correlation between the two symptoms was .68 (95% CI [.59, .77]), while the individual-specific environmental correlation, including correlated measurement error, was .41 (95% CI [.34, .48]). Of the additive genetic factors of 43% that influence somatization, approximately half (20%) were associated with those related to HB, with the remainder being due to genes unique to somatization. A substantial part (48%) of individual environmental variance in somatization was unrelated to HB; only 9% of the environmental variance was shared with HB. Our findings suggest that HB and somatization have shared genetic etiology, but environmental factors that precipitate the development of HB and somatization may be largely independent from each other.
Enhanced odor sensitivity, particularly toward threat-related cues, may be adaptive during periods of danger. Research also suggests that chronic psychological distress may lead to functional changes in the olfactory system that cause heightened sensitivity to odors. Yet, the association between self-reported odor sensitivity, objective odor detection, and affective psychopathology is currently unclear, and research suggests that persons with affective problems may only be sensitive to specific, threat-related odors.
Methods
The current study compared adults with self-reported odor sensitivity that was described as functionally impairing (OSI; n = 32) to those who reported odor sensitivity that was non-impairing (OS; n = 17) on affective variables as well as quantitative odor detection.
Results
Increased anxiety sensitivity, trait anxiety, depression, and life stress, even while controlling for comorbid anxiety and depressive disorders, was found for OSI compared to OS. While OSI, compared to OS, demonstrated only a trend increase in objective odor detection of a smoke-like, but not rose-like, odor, further analysis revealed that increased detection of that smoke-like odor was positively correlated with anxiety sensitivity.
Conclusion
These findings suggest that persons with various forms of psychological distress may find themselves significantly impaired by an intolerance of odors, but that self-reported odor sensitivity does not necessarily relate to enhanced odor detection ability. However, increased sensitivity to a smoke-like odor appears to be associated with sensitivity to aversive anxiogenic stimuli. Implications for the pathophysiology of fear- and anxiety-related disorders are discussed.
A study conducted as part of the development of the Eleventh International Classification of Mental Disorders for Primary Health Care (ICD-11 PHC) provided an opportunity to test the relationships among depressive, anxious and somatic symptoms in PHC.
Method
Primary care physicians participating in the ICD-11 PHC field studies in five countries selected patients who presented with somatic symptoms not explained by known physical pathology by applying a 29-item screening on somatic complaints that were under study for bodily stress disorder. Patients were interviewed using the Clinical Interview Schedule-Revised and assessed using two five-item scales that measure depressive and anxious symptoms. Structural models of anxious-depressive symptoms and somatic complaints were tested using a bi-factor approach.
Results
A total of 797 patients completed the study procedures. Two bi-factor models fit the data well: Model 1 had all symptoms loaded on a general factor, along with one of three specific depression, anxiety and somatic factors [x2 (627) = 741.016, p < 0.0011, RMSEA = 0.015, CFI = 0.911, TLI = 0.9]. Model 2 had a general factor and two specific anxious depression and somatic factors [x2 (627) = 663.065, p = 0.1543, RMSEA = 0.008, CFI = 0.954, TLI = 0.948].
Conclusions
These data along with those of previous studies suggest that depressive, anxious and somatic symptoms are largely different presentations of a common latent phenomenon. This study provides support for the ICD-11 PHC conceptualization of mood disturbance, especially anxious depression, as central among patients who present multiple somatic symptoms.
Background: Theories concerning the aetiology of functional neurological symptom disorder (FNSD; also known as conversion disorder) have historically inferred that psychological factors or dissociative states underlie patients’ symptoms. Current psychological models of functional neurological symptoms suggest that some type of ‘top-down’ representations/beliefs are activated automatically (without conscious awareness), leading to symptoms. It is assumed that these representations or beliefs are similar to the idea ‘I am neurologically damaged’, as in our clinical experience, almost all patients have some reason to doubt the integrity of their neurological system. Aims: It was hypothesized that FNSD arises from a belief of being neurologically damaged (via a mechanism akin to a nocebo response), and an interdisciplinary treatment protocol was developed consistent with this hypothesis, transparently sharing this theory with participants. Method: A retrospective consecutive case series design was utilized, measuring functional independence and symptom remission. Results: Of the 13 episodes of care, 12 resulted in complete or almost complete symptom remission. Length of stay in rehabilitation was also reduced compared with previous treatment attempts. Conclusions: It appears as if the treatment protocol may be very effective, and further controlled study appears warranted.
This study investigates the job demands-resources (JD-R) model in relation to work motivation in a self-determination theory (SDT) perspective, with the purpose of developing a model where social-contextual factors are seen in relation to psychological needs in order to explain autonomous work motivation and, in turn, self-reported work performance and somatic symptom burden. SEM-analyses of cross-sectional survey data including 405 waiters/waitresses in Norway were conducted to evaluate the hypothesized model. Results indicate that different job resources have different relations to psychological need satisfaction, and that certain types of job demands (i.e., job challenges) actually may enhance satisfaction of specific psychological needs. In particular, task autonomy had a positive relation to autonomy satisfaction (p < .001) and to competence satisfaction (p < .05), positive feedback had a positive relation to autonomy-, competence-, and relatedness satisfaction (p < .001), and workload had a positive relation to competence satisfaction (p < .001). Furthermore, psychological needs for autonomy, competence, and relatedness positively related to autonomous work motivation and, in turn, positively to work performance and negatively to somatic symptom burden (p < .001). Indirect relations were also detected between the job characteristics and autonomous work motivation and between the basic needs and work performance (p < .05). Hence, when explaining autonomous work motivation and work outcomes, it is important to distinguish between different job demands and job resources, as well as among the three psychological needs.
Children born of war are a common phenomenon of conflict. In the aftermath of World War II, more than 200,000 German occupation children (GOC) were fathered by occupation soldiers and born to local women. GOC often grew up under difficult conditions and showed high prevalence rates of mental disorders even decades later.
Methods:
Experiences of childhood maltreatment and their association with Posttraumatic Stress Disorder (PTSD), depression, and somatization in GOC (N = 146) are investigated and compared with a representative birth-cohort-matched sample (BCMS) from the German general population (N = 920).
Results:
Outcomes show significantly higher prevalence rates of emotional abuse/neglect, physical, and sexual abuse in GOC compared to BCMS. All five subtypes of childhood maltreatment increase the risk of PTSD and somatoform syndrome; depressive syndromes are associated with emotional abuse/neglect and physical abuse. GOC were at high risk of childhood maltreatment.
Conclusions:
Findings underline the complex, long-term impact of developmental conditions and childhood maltreatment on mental disorders even decades later.
A positive significant relationship (p<0,01) is found between a psychiatric judgement on autonomic nervous system complaints and a “blind” neurological judgement on paroxysmal EEG phenomena. Classification: Somatization Disorder (DSM-III-R; IV 300.81). Diagnoses: nervous functional complaints, hyperventilation syndrome, Da Costa's disease (irritable heart syndrome, neurocirculatory asthenia) and irritable bowel syndrome. A positive significant relationship (p<0,001) is found between a diagnosis of “Da Costa's disease” and a “blind” neurological judgement on PEF. A positive significant relationship (p<0,001) is found between a psychiatric judgement on neurasthenia (atypical headache and atypical tiredness) classified as dysthymia DSM-IH-R 300.40 and a neurological judgement on localised (cortical) abnormalities by “blind” EEG evaluation. No medication in the last half year. Logistic regression analysis (n=116) revealed that sex and age are of no importance. No medication in the last half year before EEG registration.
To describe the symptoms and functional changes in patients with high levels of somatization who were referred to an outpatient, multidisciplinary, shared mental healthcare (SMHC) service that primarily offered cognitive behavioural therapy. Second, we wished to compare the levels of somatization in this outpatient clinical sample with previously published community norms.
Background
Somatization is common in primary care, and it can lead to significant impairment, disproportionate resource use, and poses a challenge for management.
Methods
All the patients (18+ years, n=508) who attended three or more treatment sessions in SMHC primary care over a seven-year period were eligible for inclusion to this pre–post study. Self-report measures included the Patient Health Questionnaire’s somatic symptom severity scale (PHQ-15) and the World Health Organization Disability Assessment Schedule (WHODAS II). Normative comparisons were used to assess the degree of symptoms and functional changes.
Findings
Clinically significant levels of somatization before treatment were common (n=138, 27.2%) and were associated with a significant reduction in somatic symptom severity (41.3% reduction; P<0.001) and disability (44% reduction; P<0.001) after treatment. Patients’ levels of somatic symptom severity and disability approached but did not quite reach the community sample norms following treatment. Multidisciplinary short-term SMHC was associated with significant improvement in patient symptoms and disability, and shows promise as an effective treatment for patients with high levels of somatization. Including a control group would allow more confidence regarding the conclusions about the effectiveness of SMHC for patients impaired by somatization.
The aim of the controlled therapy study was to evaluate the effect of a 6 session biofeedback intervention program on cognitive aspects of patients with somatoform disorders. The treatment consisted of psycho-physiological demonstrations how mental processes can influence biological functions. We expected this treatment to be of high credibility, to change maladaptive cognitions, to enhance acceptance of psychosocial causal attribution and to improve coping.
Methods:
Patients were assessed using a structured interview to diagnose somatization syndrome (SSI-8) and comorbidity according to DSM-IV criteria. Fifty patients were recruited and randomly assigned to biofeedback treatment or control relaxation group. Participants completed a questionnaire battery assessing cognitive characteristics, causal attributions and controllability before and after intervention as well as evaluation protocols for each session.
Results:
The results suggest that biofeedback modified the patients' cognitive schemata: Patients with somatization syndrome of the biofeedback group showed a greater reduction of catastrophizing of somatic sensations and higher acceptance of psychosocial causal attributions than the control group. Both groups improved significantly in the conviction of self-efficacy.