fa تخصصي Special Orginal Article <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Times New Roman;">The study aimed to compare the effectiveness of transcranial direct current stimulation (t DCS) and intensive short-term dynamic psychotherapy (ISTDP) in improving clinical symptoms of adults with Attention-Deficit /Hyperactivity Disorder (ADHD). The statistical population consisted of adults with ADHD who were referred to Hayyan Clinic in Mashhad during the first semester of 2024. Using convenience sampling, 21 participants (18 women and 3 men) were selected and randomly assigned to three groups (n = 7 per group). The study employed a quasi-experimental pretest&ndash;posttest design with a two-month follow-up. Participants were allocated to t DCS, ISTDP, and control groups. Clinical symptoms were assessed using the 30-item short form of the Conners&rsquo; Adult ADHD Rating Scale &ndash; Self-Report (CAARS-SR-SV; Conners) (12), Persian version, (13). Data were analyzed using repeated-measures analysis of variance. The findings indicated that participants in both intervention groups demonstrated improvement over time. However, post hoc between-group comparisons revealed no significant differences between the two intervention groups and the control group (p < .05). The results suggest that both therapeutic approaches, despite their distinct mechanisms of action, were effective in reducing clinical symptoms of adult ADHD.</span></span><br> &nbsp;</div> Intensive Short Term Dynamic Psychotherapy, Transcranial Direct Current Stimulation, Clinical Symptoms 38 51 http://jrhms.thums.ac.ir/browse.php?a_code=A-10-213-1&slc_lang=fa&sid=1 Afshin Hooshangi 10031947532846002070 10031947532846002070 No Department of Psychology, ToJ, C., Islamic Azad University, Mashhad, Iran Mohammad Rajabi 10031947532846002071 10031947532846002071 Yes Department of Psychology, ToJ, C., Islamic Azad University, Mashhad, Iran Ali Akbar Saremi 10031947532846002072 10031947532846002072 No Department of Psychology, ToJ, C., Islamic Azad University, Mashhad, Iran