Showing 6 results for Transcranial Direct Current Stimulation
Amin Arkan, Fereydoon Yaryari,
Volume 2, Issue 2 (9-2014)
Abstract
Aim of this research was exploring effect of transcranial direct current stimulation (TDCS) on working memory (WM) in dorsolateral prefrontal cortex (DLPFC) region in healthy people.The method used in this research was experimental with random assignment and control group. The population was male students of Kharazmi university in range of 18 to 23 years old. Thirty participant undertook three experimental sessions in which they received 15 minutes of 2 mA anodal TDCS or sham TDCS. After and before stimulation participant performed n-back task to measure reaction time and correct answers. After analysis of covariance there was significant statistically changing in reaction time and correct answers.The results shows that anodal stimulation reduced reaction time and increased correct answers and it seems made enhance on working memory
Alireza Moradi, Mahboobeh Bagheri, Peyman Hassani Abharian,
Volume 6, Issue 4 (3-2019)
Abstract
The aim of this research was to determine the effectiveness of tDCS and cognitive rehabilitation of working memory and the combination of these two methods on speed of processing and symptoms of dyslexia on bilingual children. Research method; semi experimental (pre-test, post-test and control group). Research population included all of the bilingual children at both sex at the age of 7-11 in Tehran and Kahrizak cities. Available samples were selected through Wexler intelligent questionnaire and Nama dyslexia test scores, so that 40 dyslexic students (based on school diagnostic system) and situated randomly in 4 groups: a) intervention by tDCS brain stimulation, b) computational cognitive rehabilitation via working memory module of RehaCom, c) simultaneous intervention of computational cognitive rehabilitation and brain stimulation tDCS and d) control group. Nama and speed of processing (SDMT) tests have been performed on all of the four groups in pre-test and post-test in order to data collecting. Data analysis results using analysis of multi-variable covariance in SPSS-22 showed that mentioned interventions could have meaningful changes in speed of processing and in decreasing dyslexia symptoms. Post hoc test results also showed that combination method first of all and then brain stimulation method have been the most effectiveness, but the mere computational cognitive rehabilitation method has not been influenced on these two variables alone.
Mr Reza Mohammadzadeghan, Mr Abolfazl Farid, آقای Gholamreza Chalabianlu Hasratanlo, آقای Javad Mesrabadi,
Volume 10, Issue 2 (10-2022)
Abstract
This research aimed to compare the effectiveness of mindfulness-based socio-emotional learning program with/and without Transcranial Direct Current Stimulation on sustained attention and response inhibition in children with attention deficit/hyperactivity disorder. This research was a semi-experimental study with a pre-test and post-test design with a control group. The statistical population included all students aged 11 to 14 who referred to child and adolescent counseling centers in Khoy city in 2021-2022 year. 45 people with attention-deficit/hyperactivity disorder of the mixed type were selected from among those who refer to the treatment centers by the purposeful sampling method and randomly replaced in two experimental groups and one control group. The first experimental group received the mindfulness-based socio-emotional learning program combined with Transcranial Direct Current Stimulation and the second experimental group received the mindfulness-based socio-emotional learning program for 8 weeks, but the control group did not receive any intervention. All participants were measured before and after the training using continuous performance test and GO/NO-GO test. For data analysis, multivariate covariance analysis was used in SPSS program. Data analysis showed that mindfulness-based socio-emotional learning combined with Transcranial Direct Current Stimulation compared to the other two groups and mindfulness-based socio-emotional learning compared to the control group were more effective on sustained attention and response inhibition. According to the findings, it can be suggested that the mindfulness-based socio-emotional learning program combined with Transcranial Direct Current Stimulation is an effective intervention to improve the cognitive functions of children with attention deficit/hyperactivity disorder.
Moslem Kord, Jalil Fath Abadi, Shahriar Gharibzadeh, Reza Khosrowabadi,
Volume 10, Issue 3 (3-2023)
Abstract
This study aimed to comparison of the effect of Transcranial Direct Current Stimulation (tDCS) and Transcranial Random Noise Stimulation (tRNS) combined with cognitive training on working memory performance of people with attention deficit/hyperactivity disorder. For this purpose, 45 children with attention deficit hyperactivity disorder in zahedan city were purposefully selected as the research sample. Subjects were divided into three groups: tDCS, tRNS and placebo group. Subjects in the experimental groups received 5 sessions of electrical stimulation (tDCS and tRNS) with an interval of 24 hours between each session; placebo group also received fake stimulation (non-effective). At the same time, all subjects also received cognitive rehabilitation of working memory. All subjects were evaluated before and after the stimulation and one week after the stimulation using the N-back task and the Wechsler Digit span test. The data were analyzed using repeated measures analysis of variance. The results showed that in the tDCS group, there was a significant difference in most working memory components from the pre-test stage to the follow-up (p<0.001). In the tRNS group, a significant difference was found in the component of direct digit span and reverse digit span in the research stages. In the comparison between the two experimental groups, the effectiveness of the tDCS group was higher than that of the tRNS group. Also, no significant difference was found in most of the components between the tRNS and placebo groups (p>0.05). Overall, the results of this study show that tDCS was more effective than tRNS in working memory and this method can be used together with other treatments to improve the working memory of children with attention deficit/hyperactivity disorder.
Arezoo Mojarrad, Esmaeil Sadri Damirchi, Ali Sheykholeslami, Ali Rezaei Sharif, Vahid Abbasi,
Volume 11, Issue 4 (3-2024)
Abstract
The purpose of this study was to compare the effectiveness of transcranial direct current stimulation (tDCS) and short-term cognitive rehabilitation protocol on Symptoms of hallucinations and delusions in the elderly with mild Alzheimer's disease. The research method was an extended experiment with two experimental groups and one control group, which was conducted using the pre-test and post-test method. The statistical population included all elderly people over 65 years of age with mild Alzheimer's who had referred to a neurologist in 1401, and among these people, 60 people were selected by available sampling and then randomly. They were assigned in two experimental groups and one control group (20 people in each group). Then, the independent variables of transcranial direct current stimulation (tDCS) for 10 sessions of 20 minutes once a week on an experimental group and a short-term cognitive rehabilitation program for 9 sessions (90 minutes each session) It was designed according to the documentary method and based on Luria's (1963) healthy function replacement approach, and after confirming the validity of the content by experts, it was applied to the second experimental group once a week, and no intervention was performed on the third group. After the end of the intervention, the post-test was conducted with an interval of one week on the experimental and control groups. After one month, the studied groups were followed up again. Neuropsychological Questionnaire (NPI) was used to collect data. The results showed that both methods improve hallucination symptoms in the elderly with mild Alzheimer's and there is no significant difference between the effectiveness of these two methods. while they had no significant effect on the delusion variable. Therefore, it can be concluded that both methods can be used to improve hallucinations in the elderly with mild Alzheimer's disease.
Mojtaba Ahmadi, Associate Professor Gholamreza Chalabianloo, Associate Professor Reza Abdi,
Volume 13, Issue 2 (9-2025)
Abstract
The present study aimed to investigate the effectiveness of Unified Protocol (UP) and transcranial Direct Current Stimulation (tDCS) treatment on working memory and continuous attention in patients with generalized anxiety disorder (GAD). The research design employed a quasi-experimental framework, featuring a pre-test and post-test design with two experimental groups and a control group. The statistical population consisted of patients diagnosed with GAD who sought treatment at clinics and specialized neuropsychiatry centers in Tehran during the first half of 2024. Based on the inclusion and exclusion criteria, a sample of 45 individuals (31 women and 14 men) was selected through purposive sampling and equally allocated (15 individuals in each group) into the UP intervention group, the combined UP and tDCS intervention group, and the waiting list group. The Structured Clinical Interview (SCID-V), the 7-item Generalized Anxiety Disorder Scale (GAD-7), the Corsi Block Test (to assess working memory), and the Clock Test (to assess continuous attention) were utilized as assessment tools. Statistical analyses were conducted using SPSS-26 statistical software, employing analysis of covariance (ANCOVA). The findings indicated that the use of the UP protocol, both alone and in combination with tDCS, led to a significant improved in working memory and continuous attention (P<0.05). Furthermore, this study suggests that both UP intervention and the combined intervention (UP+tDCS) are effective approaches to improve working memory and continuous attention in GAD patients and may serve as a novel strategy for managing this disorder and improving executive functions.
