Yousef Moghdas Tabrizi - Faculty of Physical Education and sport science, University of Tehran, Tehran, Iran
Meysam Yavari - Faculty of Physical Education and sport science, University of Tehran, Tehran, Iran
Shahnaz Shahrbanian - Faculty of Humanities, Department of Physical Education, Tarbiat Modares University, Tehran, Iran

Background and Aim : Previous studies have reported dorsolateral prefrontal cortex (DLPFC) and posterior parietal cortex (PPC) activation during spatial working memory (SWM) performance, so we decided to investigate the effect of Transcranial direct current stimulation (t-DCS) in order to comparing between these two areasMethods : Sixty healthy right-handed students (30 female, 29 male with mean age= 24 years) were randomly assigned in anodal (A=30) and sham group (S= 29) and each of them into F4 and P4 subgroups respectively. Computerized Corsi Block Tapping task (CBT) has been used to measure the spatial working memory. T-DCS intervention consists of 5 daily sessions with a 24-hour interval between them and in each session direct current of 1.5 mA for 15 minute over F4 and P4 areaResults : A significant enhancement of SWM span and faster response were seen after anodal tDCS in both forward and backward direction. Moreover in comparison right DLPFC stimulation could induce faster reaction time than right PPConclusion : DLPFC as an element of fronto-parietal network is activated in stimulus neural processing during retention stage. Our finding provide new evidence in comparison of stimulation between two main activated cortical areas (PP & DLPFC) during visuospatial WM

Transcranial Direct Current Stimulation;motor imagery; Prefrontal;Parietal