Massachusetts General Hospital Hairpulling Scale: Validity and Reliability Study of the Turkish Form. / Massachusetts Genel Hastane Saç/Kil Yolma Ölçegi: Türkçe Formunun Geçerlik ve Güvenirlik Çalismasi.

OBJECTIVE: The aim of this study is to analyze the validity and reliability of the Turkish form of Massachusetts General Hospital Hairpulling Scale (MGH-HPS), which is used to measure the severity of Trichotillomania (TTM). METHODS: Fifty patients diagnosed with TTM according to the DSM-5 diagnostic criteria and fifty healthy controls participated in the study. The participants were asked to complete a sociodemographic questionnaire, the MGH-HPS-TR, the Clinical Global Impression (CGI), the Beck Depression Inventory (BDI), the Beck Anxiety Inventory (BAI) and the Barratt Impulsiveness Scale (BIS-11). The construct validity and the criterion validity of the MGH-HPS-TR were determined by means of exploratory factor analysis (EFA) and confirmatory factor analysis (CFA), respectively. The reliability analysis of the MGH-HPS-TR was assessed by calculating the Cronbach's α coefficient and the item total correlation coefficient. The values for the area under the curve (AUC), sensitivity and specificity were based on the ROC analysis. RESULTS: AFA and CFA results indicated a single factor structure with 7 items explaining 82.5% of the variance. The item/factor loadings were satisfactory with the best fit indeces. Correlations were found between the scores on the MGH-HPS-TR and the other scales used for criterion validity analyses. The internal consistency and the item-total correlation coefficients of the scale were found to be satisfactory. Based on a cut of point of ≥ 9, the scale had high power for discriminating between the patient and the control groups and high sensitivity and specificity. CONCLUSION: This study showed that the MGH-HPS-TR can be used as a valid and reliable psychometric tool in Turkey.

Association of Dissociation with Suicide Attempt and Non-Suicidal Self Injury in Adolescents with a History of Sexual Abuse.

Objective: Dissociative symptoms are considered risk factors for suicide and non-suicidal self-injury (NSSI). In this study, the relationship between suicidal behaviors and NSSI with dissociative symptoms in adolescents with a history of Child Sexual Abuse (CSA) was investigated. Methods: A total of 100 adolescents with a history of CSA were evaluated with a detailed forensic psychiatric interview. Dissociative symptoms were measured with the self-report Adolescent Dissociative Experiences Scale (A-DES) and the parent-reported Child Dissociative Checklist (CDC). Results: While dissociative symptoms did not differ between adolescents with and without suicide attempts (CDC; p = .068 and A-DES; p = .060), they were significantly higher in adolescents with non-suicidal self-harming behavior (CDC; p < .001 and A-DES; p = .001). Suicide attempts and NSSI were more common in those who reported genital touching as a type of sexual abuse (respectively, p = .003; p = .048). In regression analysis; history of psychiatric treatment (OR = 9.09 [95% CI = 1.52, 54.29]) and NSSI (OR = 8.18 [95% CI = 2.01, 33.23]) were independently associated with suicide attempts. In addition, parent-reported dissociative symptoms (CDC scores) (OR = 1.27 [95% CI = 1.06, 1.53] and suicide attempt (OR = 8.09 [95%CI = 1.96,33.42] showed independent association with NSSI. Conclusions: Dissociative symptoms may be predictive factors for NSSI and should be considered in risk assessment of adolescents with a history of CSA.

Clinical Characteristics and Comorbidities of Patients with Trichotillomania and Skin Picking Disorder Who Admitted to a Psychodermatology Outpatient Clinic: A Comparative Study. / Psikodermatoloji Poliklinigine Basvuran Trikotillomani ve Deri Yolma Bozuklugu Tanili Hastalarin Klinik Özellikleri ve Es Tanilari: Bir Karsilastirma Çalismasi.

OBJECTIVE: Trichotillomania (TTM) and Skin Picking Disorder (SPD) are psychiatric disorders characterized by chronic and compulsive pulling and picking to remove hair and skin. There are very few studies on the clinical and phenomenological differences of TTM and SPD. In this study we aimed to compare the clinical characteristics and comorbidities of patients diagnosed with TTM and SPD. METHOD: We enrolled 56 TTM and 113 SPD patients who were assessed with SCID-I for DSM-IV. In addition, we evaluated the DSM- 5 criteria for Obsessive and Compulsive Disorder spectrum. We also utilized sociodemographic form, the Clinical Global Impression Scale, the Beck Anxiety Inventory and the Beck Depression Inventory. RESULTS: Although patients with TTM and SPD had many common clinical features and comorbidities, statistically significant differences were determined in the number of the pulling/picking sites (Z=- 7.084; p<0.001), the type of the outpatient clinics which they initially consulted (χ2=19.451; p<0.001), reasons for pulling/picking behavior (p<0.05) and comorbidities of depression (χ2=3.878; p=0.049) and onychophagia (χ2=7.173; p=0.007). Disease severity and depression and anxiety scores of patients with TTM and SPD who had comorbid diseases were statistically significantly higher compared to the patients without comorbidities (p<0.005). CONCLUSION: TTM and SPD often present with common clinical characteristics and a high incidence of psychiatric comorbidities. Finding out the clinical characteristics, the triggering factors and determining the comorbidities are important to gain an understanding of the course and determine the appropriate treatment for these disorders. Hence, phenomenological studies on large patient populations are needed.

The Relationship between Anxiety and Depression Levels with Perceived Stress and Coping Strategies in Health Care Workers during the COVID-19 Pandemic.

OBJECTIVES: Coronavirus disease (COVID-19) has spread rapidly, locally and internationally after it started in Hubei province of China in December 2019. During the spread of this infectious disease in the world, health care workers are taking place as the main people in the screening and treatment of the disease. The present study aims to evaluate the relationship between anxiety and depression levels with perceived stress and coping strategies in health care workers during the COVID-19 pandemic. METHODS: In this study, 200 participants were included. Beck Anxiety Inventory (BDI), Beck Depression Inventory (BDI), Perceived Stress Scale-10 (PSS-10) and COPE (Coping Orientation to Problems Experienced) were applied. RESULTS: Mean scores for BDI and BAI were 9.2±8.9 and 8.2±9.2, respectively. BDI scores of 33 (16.5%) of 200 participants were ≥17. 62% of the participants had minimal depression, 21.5% of the participants had mild depression, 13.5 % of the participants had moderate depression, and 3% of the participants had severe depression according to BDI scores. 60.5% of the participants had minimal anxiety, 25.5% of the participants had mild anxiety, 8.5% of the participants had moderate anxiety and 5.5% of the participants had severe anxiety according to BAI scores. BAI and BDI scores of the female participants were statistically higher than the male participants. A statistically significant positive correlation was found between BAI and BDI scores and PSS-10 scores. A statistically significant difference was found in the averages of BAI and BDI, PSS-10 COPE 3 (Focus on and venting of emotions), 7 (Religious coping) and 13 (Acceptance) subscales levels in occupational groups. A statistically significant difference was found in BDI levels in the clinical units during the pandemic. CONCLUSION: This study indicated that different coping strategies can be used in health care workers regarding anxiety, depression and stress levels during the COVID-19 pandemic. While problem-solving and emotion-focused adaptive coping mechanisms help reduce symptoms, maladaptive and negative coping mechanisms can cause symptoms to exacerbate. Thus, training should be given to developing attitudes of health care workers to cope with stress.

The effect of bilateral high frequency repetitive transcranial magnetic stimulation on cognitive functions in schizophrenia.

•Despite their major effects on positive symptoms, antipsychotics do not have a significant effect on cognition in schizophrenia•Bilateral high frequency rTMS targeting dorsolateral prefrontal cortices has been effective on working memory•Bilateral 20 Hz rTMS improved attention and verbal working memory in schizophrenia patients,•It also improved the competence of switching the perceptional set up under a disruptive effect towards new instructions, in this study.

Repetitive Transcranial Magnetic Stimulation in the Treatment of Skin Picking Disorder: An Exploratory Trial.

OBJECTIVES: Skin picking disorder (SPD) falls into the category of "obsessive-compulsive disorder and related disorders" in the Diagnostic and Statistical Manual of Mental Disorders (Fifth Edition). Repetitive transcranial magnetic stimulation (rTMS) treatment has been reported to be a promising therapy in obsessive-compulsive disorder-related disorders. The purpose of this study was to demonstrate the efficacy of rTMS treatment in patients with SPD. METHODS: Fifteen patients with SPD were assigned to receive 3 weeks' treatment with either active (n = 8) or sham rTMS targeting the pre-supplementary motor area. Patients were evaluated using the Beck Depression Inventory, Beck Anxiety Inventory, Skin Picking Impact Scale, and the Yale-Brown Obsessive Compulsive Scale Modified for Neurotic Excoriation. Response to treatment was defined as a ≥35% decrease on Yale-Brown Obsessive Compulsive Scale modified for Neurotic Excoriation. RESULTS: Treatment response was achieved in 62.5% of patients (5/8) in the active group and 33.3% of patients (2/6) in the sham group. However, there were no significant differences between the groups in terms of primary and secondary outcomes. CONCLUSIONS: In this exploratory study, active rTMS could not be demonstrated to be superior over sham in treatment of SPD. The results of this study indicate the need for further rTMS studies to be conducted with larger sample sizes and subtypes of SPD.

The Relationship Between Anxiety, Depression, Suicidal Ideation and Quality of Life in Patients with Rheumatoid Arthritis.

Rheumatoid arthritis (RA) is a chronic disease and many patients with RA experience lifelong anxiety and depression. The aim of this study is to provide an assessment of anxiety, depression, suicidal ideation, disease activity and quality of life in patients with RA. Fifty patients were included in the study. Hospital Anxiety and Depression Scale (HADS), Short Form Health Survey (SF-36), Beck Scale for Suicide Ideation (BSSI) and Disease Activity Score (DAS-28) were applied. A statistically negative correlation was found between HADS-A and HADS-D scores and all subscales of SF-36. There was a statistically negative correlation between the DAS-28 score and the subscales of the SF-36 except mental health and bodily pain. Suicidal ideation was associated with anxiety and depression and BSSI scores of patients suffering from anxiety and depression are higher than the patients not suffering from anxiety and depression. There was a statistically negative correlation between BSSI and the subscales of SF-36 excepting physical role. This study indicated that anxiety, depression, quality of life, disease activity and suicidal ideation are related to each other in patients with RA. The presence of concomitant anxiety and depression may lead to suicide and poor quality of life and may worsen the prognosis of the RA.

The alteration of retinal nerve fibre layer thickness with repetitive transcranial magnetic stimulation in patients with treatment resistant major depression.

OBJECTIVE: The nerves and axons of the retinal nerve fibre layer (RNFL) are similar to those in the brain and therefore retina is considered as the extension of the brain. We aimed to evaluate the RNFL thickness in the treatment-resistant major depressive patients before and after repetitive transcranial magnetic stimulation (rTMS) treatment and at least 6 months later after rTMS treatment using optical coherence tomography (OCT). METHODS: Thirty patients with treatment resistant major depression and 24 healthy controls were included in the study. rTMS was applied to the left dorsolateral prefrontal cortex (DLPFC) of the patients. RESULTS: rTMS was initiated in 28 patients. OCT assessments were performed in 24 patients at baseline and after rTMS treatment and in 19 patients at least sixth months after the rTMS treatment. We found significant increase in RNFL thickness compared with controls at the baseline and further increase in RNFL thickness after rTMS treatment. Although there was a decreasing trend in RNFL thickness 6 months after rTMS treatment, 6 months later RNFL thickness was still higher compared with controls. CONCLUSIONS: RNFL thickness is increased in treatment resistant major depression and rTMS over the left DLPFC further increases RNFL thickness in treatment resistant major depressive patients.

Thioredoxin is not a marker for treatment-resistance depression but associated with cognitive function: An rTMS study.

Elevated oxidative stress is known to play an important role in development of depression and cognitive dysfunction. To date, thioredoxin (TRX), an antioxidant protein, has been investigated as a marker for psychiatric disorders such as schizophrenia, bipolar disorder and autism but its relationship with depression is yet to be unknown. The aim of this study is to detect the TRX levels in patients with treatment-resistant depression (TRD), analyse the effect of rTMS (repetitive transcranial magnetic stimulation) application on TRX levels and display the relationship of TRX with cognitive areas. This study included 27 treatment-resistant unipolar depression patients and 29 healthy subjects. Patients were evaluated by Hamilton Depression Scale (HDRS), Hamilton Anxiety Scale (HARS) and Montreal Cognitive Assessment (MoCA) before and after rTMS application. 23 of TRD patients were applied high-frequency rTMS over left DLPFC for 2 to 4weeks and plasma TRX levels of patients and healthy subjects were measured. No significant difference was determined between the TRX levels of patients and healthy subjects (p>0.05). After rTMS application there were significant decrease in severity of depression (p<0.001) and anxiety (p<0.001), and explicit improvement in cognitive areas (delayed memory, visual-spatial/executive abilities and language points) (all p<0.05). No difference was detected in TRX levels of the patients after rTMS application (p>0.005). High language scores of the patients were found to be associated with high TRX levels (p<0.005). Our study indicates that TRX levels cannot be used as a marker for TRD or rTMS treatment in TRD. In spite of this TRX levels have a positive correlation with language functions of the patients of TRD. More extensive studies are required to clarify the mechanism of action of TRX and the effect of TRX on cognitive functions.

A Cross-Sectional Investigation of Quality of Life in Patients with Polycystic Ovary Syndrome.

OBJECTIVES: The aim of this study is to investigate the effect of physical signs and comorbid psychopathology on quality of life in women with polycystic ovary syndrome (PCOS). METHODS: This cross-sectional study was conducted to assess 84 women with PCOS according to Rotterdam diagnosis criteria. Structured Clinical Interview for DSM-IV Axis 1 Disorders (SCID-I) and the World Health Organization Quality of Life-Brief Form (WHOQOL-BREF) were applied to each participant. The biochemical parameters and physical signs of the participants were evaluated. RESULTS: A negative correlation was found between hirsutism score and physical, psychological, social, and environmental domains of WHOQOL-BREF (p=0.023, p=0.007, p=0.020, and p=0.033, respectively). Furthermore, a negative correlation was found between body mass index (BMI) and psychological domain of WHOQOL-BREF (p=0.001). Depression was found to be an important predictor for physical, psychological, and social domains of quality of life (p=0.002, p=0.001, and p=0.001, respectively). CONCLUSION: Comorbid depression and high BMI and hirsutism scores decrease the quality of life in women with PCOS.

The relationship between childhood sexual/physical abuse and sexual dysfunction in patients with social anxiety disorder.

BACKGROUND: Childhood traumatic events are known as developmental factors for various psychiatric disorders. OBJECTIVE: The aim of this study was to investigate the effects of childhood sexual and physical abuse (CSA/CPA), and co-morbid depression on sexual functions in patients with social anxiety disorder (SAD). METHOD: Data obtained from 113 SAD patients was analysed. Childhood traumatic experiences were evaluated using the Childhood Trauma Questionnaire, and the Arizona Sexual Experience Scale was used for the evaluation of the sexual functions. The data from interviews performed with SCID-I were used for determination of Axis I diagnosis. The Beck Anxiety Scale, Beck Depression Scale and Liebowitz Social Anxiety Scale were administered to each patient. RESULTS: History of childhood physical abuse (CPA) was present in 45.1% of the SAD patients, and 14.2% had a history of childhood sexual abuse (CSA). Depression co-diagnosis was present in 30.1% of SAD patients and 36.3% had sexual dysfunction. History of CSA and depression co-diagnosis were determined as two strong predictors in SAD patients (odds ratio (OR) for CSA, 7.83; 95% CI, 1.97-31.11; p = 0.003 and OR for depression, 3.66; 95% CI, 1.47-9.13; p = 0.005). CONCLUSIONS: CSA and depression should be considered and questioned as an important factor for SAD patients who suffer from sexual dysfunction.

Psychiatric comorbidity in patients with conversion disorder and prevalence of dissociative symptoms.

The 1st objective of the current study was to investigate the frequency and types of dissociative symptoms in patients with conversion disorder (CD). The 2nd objective of the current study was to determine psychiatric comorbidity in patients with and without dissociative symptoms. A total of 54 consecutive consenting patients primarily diagnosed with CD according to Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision, criteria who were admitted to the psychiatric emergency outpatient clinic of Sisli Etfal Research and Teaching Hospital (Istanbul, Turkey) were included in the study. The Structured Clinical Interview for DSM-IV Axis I Disorders, Structured Interview for DSM-IV Dissociative Disorders, and Dissociative Experiences Scale were administered. Study groups consisted of 20 patients with a dissociative disorder and 34 patients without a diagnosis of any dissociative disorder. A total of 37% of patients with CD had any dissociative diagnosis. The prevalence of dissociative disorders was as follows: 18.5% dissociative disorder not otherwise specified, 14.8% dissociative amnesia, and 3.7% depersonalization disorder. Significant differences were found between the study groups with respect to comorbidity of bipolar disorder, past hypomania, and current and past posttraumatic stress disorder (ps = .001, .028, .015, and .028, respectively). Overall comorbidity of bipolar disorder was 27.8%. Psychiatric comorbidity was higher and age at onset was earlier among dissociative patients compared to patients without dissociative symptoms. The increased psychiatric comorbidity and early onset of conversion disorder found in patients with dissociative symptoms suggest that these patients may have had a more severe form of conversion disorder.

Prevalence of adult attention deficit hyperactivity disorder in the relatives of patients with bipolar disorder.

OBJECTIVE: We hypothesized that relatives of bipolar patients would have increased rate of attention deficit hyperactivity disorder (ADHD) and subsyndromal manifestations compared to demographically matched relatives of healthy controls. METHOD: Forty consecutive patients with bipolar disorder were recruited from inpatient and outpatient units of Sisli Etfal Teaching and Research Hospital, Psychiatry Department. Seventy-three first-degree relatives of bipolar disorder group were included. A control group of first-degree relatives of individuals without DSM-IV Axis I psychopathology were also recruited. The Turkish version of the Structural Clinical Interview for DSM-IV, Wender Utah Rating Scale, Turgay's Adult ADD/ADHD DSM-IV based Diagnostic and Rating Scale were administered to participants. RESULTS: Overall rate of adult ADHD in RBD group was significantly higher than RC group (9.6 vs. 1.5%; P = 0.04). Participants with adult ADHD in the RBD group had significantly higher rate of alcohol abuse compared to those without adult ADHD (14.3 vs. 1.5%; P = 0.05). Rates of OCD and dysthimia were significantly higher in the subjects with ADHD in the RBD group than the subjects without ADHD (28.6 vs. 4.5%; P = 0.02, 14.3 vs. 1.5%; P = 0.05 respectively). CONCLUSION: Our findings indicate that relatives of bipolar patients have a risk for suffering from ADHD, and support the hypothesis that relatives of bipolar patients are at a risk for developing attentional and behavioral problems.

Serum lipid levels in patients with dissociative disorder.

OBJECTIVE: There may be an association between a low serum cholesterol level and dissociative disorders. METHOD: The subjects of the study were 16 patients with dissociative disorder and 16 normal comparison subjects (two men and 14 women in each group). Total cholesterol, triglyceride, high-density lipoprotein, low-density lipoprotein, and very low density lipoprotein levels were compared. RESULTS: Patients with dissociative disorders had lower serum triglyceride, total cholesterol, low-density lipoprotein, and very low density lipoprotein levels than normal comparison subjects. CONCLUSIONS: Low serum lipid concentrations may be related to a high incidence of self-injurious behaviors and borderline features in patients with dissociative disorders.

The prevalence of parasomnias in preadolescent school-aged children: a Turkish sample.

STUDY OBJECTIVES: To survey the prevalence of parasomnias in a population of children aged 7 to 11 years and to determine whether parasomnias are associated with medical and neurobehavioral properties. DESIGN: Parents and children completed a pediatric sleep questionnaire that contains 27 items developed by the authors to assess parasomnias in children. Parents and children were also interviewed about the children's medical and sociofamilial history, schooling, psychological difficulties, medication intake, and the history of psychomotor and psychosocial development. SETTING: NA PARTICIPANTS: 971 preadolescent school-aged children from 4 locations in Turkey participated in the study. RESULTS: We found a 14.4% prevalence of parasomnia in preadolescent school-aged children. Almost every sixth child had about at least 1 parasomnia. When we examined parasomnias separately, bruxism, nocturnal enuresis, and night terrors were the most common parasomnias among both girls and boys. The prevalence of parasomnias was higher in the 9- and 10-year-old age groups than in the other age groups. Girls and boys did not differ. Children with parasomnias had higher rates of past physical illness, delays in toilet raining, behavior disturbances, adjustment problems, and learning difficulties. CONCLUSIONS: These results suggest that the prevalence of parasomnias was high in the 9- and 10-year-old age groups. Parasomnias are associated with a history of physical illness and neurobehavioral abnormalities.

Serum lipid levels, suicidality, and panic disorder.

Although the effects of serum total cholesterol and other lipids have been implicated as a predictor of suicidal behavior in major depression, the role of cholesterol level on suicide risk for panic disorder patients is not considered as a biological marker in the literature. In this study, we examined the relationship of suicidality with serum cholesterol concentration in panic disorder. The subjects of the study were 10 suicidal panic disorder patients, 19 nonsuicidal panic disorder patients, and 15 normal control subjects. The suicidal patients with panic disorder had lower serum total cholesterol and low-density lipoprotein (LDL) levels than normal control subjects. These findings suggest that there may be an association between suicidality and low serum cholesterol levels in panic disorder. We also discuss the possible role of serotonin in the brain in the relationship of suicidal behavior or ideation with low cholesterol concentration in panic disorder.

Serum lipid concentrations in obsessive-compulsive disorder patients with and without panic attacks.

OBJECTIVE: To examine serum lipid levels in patients with obsessive-compulsive disorder (OCD) and to test whether panic symptoms affect lipid concentrations in OCD patients. METHODS: We assessed 33 OCD patients and 33 healthy control subjects matched for sex and age. RESULTS: OCD patients had higher low-density lipoprotein, very-low-density lipoprotein, and tryglyceride levels, but lower high-density lipoprotein levels, than normal control subjects. We also found that only OCD patients with panic attacks had higher serum lipid concentrations, compared with normal control subjects. Serum lipid levels of pure OCD patients did not differ from control values. CONCLUSION: These findings suggest that high serum lipid concentrations are related to panic anxiety rather than other symptoms of the illness.

Clinical importance of nightmare disorder in patients with dissociative disorders.

In the present study the prevalence of nightmare disorder (ND) was examined in patients with dissociative disorders (DD), and comparison was made between those with ND and those without nightmares in terms of clinical characteristics. The 30 patients with DD (5 male and 25 female) were recruited over 12 months in the Yüzüncü Yil University Research Hospital Department of Psychiatry. The subjects were diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders (4th edn) criteria for ND. The Dissociative Experiences Scale, Beck Depression Inventory, and a semistructured interview schedule for childhood traumatic events were administered to the subjects. A 57% prevalence of ND was found among patients with DD. Among patients with DD, those with ND had a higher rate of self-mutilative behavior, a history of suicide attempt in the last year, and comorbidity with borderline personality disorder than those without ND. Nightmares or dreams should be considered in the therapy of DD patients.

Nightmares and dissociative experiences: the key role of childhood traumatic events.

In order to examine the co-occurrence of nightmares with dissociative experiences in the adolescent population and to demonstrate the impact of childhood traumatic events in this association, 292 undergraduate students were interviewed for childhood traumatic events. The Van Dream Anxiety Scale (VDAS) and Dissociative Experiences Scale (DES) were also administered to the subjects. For nightmares a 7.5% prevalence of 'often' and a 58.2% prevalence of 'sometimes' was found for college students. Nightmare prevalence was higher in women than in men. The rate of childhood traumatic experiences was higher in nightmare sufferers than in those who did not have nightmares. The subjects who had undergone physical and sexual abuse had higher VDAS global scores and item scores. When the DES scores of the subjects with nightmares were compared with that of those who had never reported nightmares, the subjects with nightmares had significantly higher scores on DES. The DES scores were also negatively correlated with duration of nightmares in subjects who had childhood traumatic experiences. These findings suggest that the subjects with childhood traumatic events failed to psychologically integrate their traumatic experiences and used dissociation as a coping strategy.

Sleep-related violence and low serum cholesterol: a preliminary study.

To examine whether there is a relationship between serum cholesterol level and sleep-related violence, we evaluated 15 patients with violent behavior during sleep (VBS) and 15 normal control subjects. The patient and control groups were matched for sex, age, and weight. There were 13 women and two men in each group. The patients with VBS had lower serum total cholesterol, triglyceride, and low-density lipoprotein levels than the healthy subjects. Low cholesterol may effect serotonergic neuronal activity and some types of 5-HT receptors, then may be related to violent behavior during sleep.