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.
Mehdi Jahani, Mohammad Nasehi, Mehdi Tehrani-Doost, Mohammad Hossein Harirchian, Mohammad-Reza Zarrindast,
Volume 10, Issue 1 (5-2022)
Abstract
Multiple sclerosis is a de-myelinating inflammatory condition of the central nervous system that is often thought of as an autoimmune disorder. These patients suffer from extensive cognitive impairments such as poor attention and concentration and memory and processing speed; Therefore, the aim of this study was to investigate the anodic effect of direct cortical electrical stimulation (tDCS) on sustained attention performance in patients with multiple sclerosis (MS) in a pretest-posttest design with a control group. For this purpose, 32 patients with MS were selected using available sampling method and randomly assigned to experimental and control groups. The intervention consisted of 10 sessions of direct electrical stimulation during which patients were divided into two groups, one group received real stimulation and the other group received sham stimulation or sham. The research instruments were the use of RTI and RVP subtests in CANTAB test. Data analysis was performed based on independent and dependent t-test to compare pre-test and post-test scores in experimental and control groups. The results showed an improvement in sustained attention and processing speed in the experimental group at a significant level of 0.05. Therefore, we conclude that transcranial electrical stimulation of the brain improves sustained attention deficit and speed of response in patients with MS.
