Background: Emotion regulation is a major and important incentive for substance abuse; in fact, substance abusers associate their abuse with the substance's soothing nature. Emotion regulation can be defined as the process, which enables individuals to regulate experiences and express emotions. Objectives:The goal of the current study was to evaluate the effectiveness of acceptance and commitment therapy (ACT) on emotion regulation in methamphetamine-dependent individuals undergoing rehabilitation. Patients and Methods:This was a quasi-experimental study of pretest-posttest design with a control group (where follow-up was also done). The population under study consisted of Methamphetamine-dependent individuals undergoing rehabilitation (MDUR), who were inpatients and outpatients of Tehran's medical centers. First, 30 MDUR, who were in the withdrawal stage were selected. Then, based on interest to participate in group therapy and matching, they were assigned to the test and control group. Mindfulnessbased acceptance and commitment therapy (ACT) in eight sessions (eight weeks) with 1.5-hour duration was done. The tool used for this project was Gratz and Roemer's difficulties in emotion regulation scale. Repeated measures Analysis of Variance (ANOVA) was used for analyzing the data. Results: Group ACT caused a significant decrease in emotion regulation scores (P < 0.001) and its following dimensions, including non-acceptance (P = 0.03), difficulties engaging in goal directed behavior (P = 0.002), impulse control difficulties (P = 0.027), and limited access to emotion regulation strategies (P = 0.038). However, it could not significantly decrease the lack of emotional awareness and clarity dimensions. Conclusions: Group acceptance and commitment therapy improved emotion regulation in methamphetamine-dependent individuals and enabled them to regulate experiences and express emotions that are very effective in controlling cravings and retention in treatment and prevention of recurrence.

Objective Schizophrenia is the most debilitating psychiatric disorder with the highest psychiatric ward admission rate. Drug therapy is the first line of treatment. However, it does not result in appropriate therapeutic responses in many patients, and they experience emotional regulation difficulties and psychosis symptoms after initial symptom resolution. Cognitive-behavioral therapy (CBT) is currently an adjuvant treatment besides drug therapy to target the persistent symptoms of psychosis. The present study aims to determine the effectiveness of CBT on the positive and negative symptoms and emotional regulation of those suffering from schizophrenia spectrum disorders. Materials & Methods The research design was single-subject and of the AB type (baseline and intervention) with a follow-up phase. Besides the routine therapy sessions, CBT sessions were held for the study participants. They were patients admitted to Razi Educational and Therapeutic and Research Psychiatric Center in Tehran City, Iran, who were selected based on the inclusion criteria. Thirty patients were selected with convenience sampling, and 5 were randomly placed in the CBT group. They were evaluated with the scales of positive and negative symptoms of Kay, Fiszbein, and Opler (1986) and difficulties in emotional regulation by Gratz and Roemer (2004) in the baseline, intervention, and follow-up phases. The treatment sessions were planned based on the CBT protocol developed by Laura Smith, Paula Nathan, Uta juniper, Patrick Kingsep, and Louella Lim (2003). Non-overlap of all pairs (NAP), percentage of non-overlapping data (PND), percentage of all non-overlapping data (PAND), percentage of data points exceeding the median (PEM), Cohen’s d effect size, and improvement percentages were used to analyze the data, and visual graphs were used for data presentation. Results The outcomes showed that in the intervention phase, compared to the baseline phase, the effect sizes of the positive and negative symptoms in the first to fifth participants were 1.6, 3.1, 3.2, 1.9, and 2.4, respectively. Only the effect sizes of the second and third participants were large. The effect sizes of the emotional regulation factor in the first to fifth participants were 2.8, 1.2, 1.1, 2.2, and 1.9, respectively. The effect size of the second participant was large, and the rest were average. The findings of this study showed that during the post-therapy and follow-up stages, while patients who had received CBT still experienced positive and negative symptoms of psychosis and difficulties in emotional regulation; these symptoms decreased in comparison with the baseline phase. Furthermore, their improvement percentages were not significant. Conclusion Data analysis showed that although CBT is effective in reducing positive and negative psychotic symptoms and improving the emotional regulation of patients, the data obtained from Cohen’s d effect size and recovery indices showed that the results are not clinically significant. In other words, although the patients who received CBT showed a slight improvement in psychotic symptoms and difficulty in emotional regulation, they could not maintain the therapeutic gains in the follow-up phase.

Background: The literature suggests the increasing application of acceptance and commitment therapy (ACT) for people with schizophrenia spectrum disorders (SSD). Objectives: This study aimed to determine the effectiveness of ACT on the positive and negative symptoms and emotion regulation of patients with SSD. Methods: The experimental design of the current study was an AB (baseline and intervention phases) along with the follow-up phase, in addition to Treatment-As-Usual (TAU), ACT sessions were held for the participants. Among the 20 participants who had inclusion criteria to the study, five participant (three men and two women in the age range of 32 - 43 years) were randomly allocated to participate in the intervention through drawing and evaluated using the Positive and Negative Syndrome Scale (PANSS) and Difficulties in Emotion Regulation Scale (DERS) in three phases of baseline, intervention, and follow-up. For data analysis, non-overlapping indices and Cohen's d effect size were measured, and visual diagrams were plotted for interpretation. Results: The present results showed that the effect sizes of psychotic symptoms in the first to fifth participants were 1.7, 1.9, 0.6, 4, and 1.4, respectively in the intervention phase relative to the baseline; the effect size was only large for the fourth participant. Also, the effect sizes of emotion regulation in the first to fifth participants were 0.8, 1.6, 1.5, 1.2, and 2.7, respectively; the effect size was only large for the fifth participant. Conclusions: The results of data analysis showed that ACT is effective in reducing psychotic symptoms and improving emotion regulation. The effect size of ACT was the largest for the fourth participant; medium for the first, second, and fifth participants; and small for the third participant.