مقالات رزومه دکتر سیامک داداشی

The aim of this study was to determine the effect of Brainwave Entrainment in alpha band on working memory, anti-saccade and anxiety level of anxious participants. The present study is a quasi-experimental project of pre-test-post-test with control group. In this regard, after screening 250 university students, 30 anxious participants were selected by Beck anxiety inventory and randomly divided into one experimental group and one control group (15 groups each). All participants were assessed in the pre-test and post-test stages by the Corsi Blocks Tapping test, Antisaccade Task and Beck Anxiety inventory. Participants in the experimental groups received 10 Hz binaural beats for 30 minutes for 5 days a week in a period of one month. Data were analyzed using multivariate analysis of covariance. The findings showed that 10 Hz binaural beats (alpha bands) significantly improved pasticipant's working memory, increased antisaccade and decreased anxiety level. Therefore, brainwave entrainment in the alpha band is recommended as a non-invasive intervention method to reduce the level of anxiety and improve cognitive functions.

Borderline personality disorder is one of the most common psychiatric disorders. The essential feature of borderline personality disorder is a pervasive pattern of instability of interpersonal relationships, self-image, and affects, and marked impulsivity that begins by early adulthood and is present in a variety of contexts. This study aimed to compare cognitive flexibility, impulsivity and quantitative educational performance in college students with borderline personality traits and normal college students. In this regard, 20 college student with Borderline personality traits and 20 normal college students were chosen by borderline personality inventory (BPI), ), and then participants were evaluated with Wisconsin Card Sorting Test, Barratt Impulsiveness Scale-11, and Educational Performance Test. Data were analyzed using Multivariate analysis of variance(MANOVA). The results showed that there are significant difference between college students with borderline personality traits and normal college students in cognitive flexibility, impulsivity and quantitative educational performance. Therefore, the results of this study indicated that college students with borderline personality traits exhibited deficits in cognitive flexibility, impulsivity and quantitative educational performance.

The aim of this study was to predict the aggression of police command staff based on job stress and executive functions. The research design was descriptive and correlational. The statistical population of the present study included all employees of the East Azarbaijan police command staff. According to the status of staff in the organization and the coronary pandemic limitations, 210 employees of the provincial police command were selected by available sampling method. Then, by referring to the police centers and police stations of the province, the relevant questionnaires were provided to the staff. After explaining how to answer, the staff completed the questionnaires . SPSS software was used for statistical analysis of research data.The results showed that there is a significant relationship between job stress and executive functions with the aggression of East Azerbaijan police command staff and these variables can significantly predict the aggression of East Azerbaijan police command staff.

Borderline personality disorder is a long-term pattern of abnormal behavior characterized by unstable relationships with other people, unstable sense of self, and unstable emotions. This study aimed to investigate the role of cognitive flexibility, visuospatial working memory and impulsivity in predicting theory of mind deficit in subjects with borderline personality disorder traits. The type of this study was correlational research. In this regard, 120 college students with Borderline personality traits were chosen by borderline personality inventory , and then participants were evaluated with Wisconsin Card Sorting Test, Barratt Impulsiveness Scale-11, Corsi Blocks Test and Reading the Mind in the Eyes Test. Data were analyzed using multiple regression. The results showed that visuospatial working memory and impulsivity predicts the theory of mind deficit in subjects with borderline personality disorder traits. Therefore, the results of this study indicated that subjects with borderline personality traits exhibited deficits in visuospatial working memory and impulsivity, and these variables predicts the theory of mind deficits in subjects with borderline personality disorder traits.

Borderline Personality Disorder (BPD) is associated with interpersonal problems, such as intense, unstable relationships and fears of abandonment. It has been hypothesized that deficits in social cognitive capacities explain these difficulties. In this regard this study aimed to compare ToM in university students with borderline personality disorder traits and normal counterparts.
20 university student with Borderline personality traits and 20 normal university students were chosen from Azarbayjan Shahid Madani Unversity by borderline personality inventory (Leichsenring, 1999), and then participants were evaluated in theory of mind with Reading the Mind (Baron-Cohen et al., 2001) in the Eyes Test. Data were analyzed using independent t- test.
The results showed that there are significant difference between university students with borderline personality traits and normal university students in Reading the Mind in the Eyes Test (p The results of this study indicated that university students with borderline personality traits exhibited deficits in theory of mind.

Many studies show that physical activities activity could prevent cognitive decline and may enhance frontal lobe activity. Thus¡ the main purpose of this article is to investigating the effect of physical activity on cognitive functions of talented youth soccer players and amateur soccer players.
statistical community in the present study involved all of the soccer players that play in Tabriz clubs. sixteen highly talented youth soccer players and sixteen age-matched amateur soccer players in the age range 18 to 25 years performed Wisconsin Card Sorting Test (WCST) for Assessment of cognitive flexibility and continuous performance test (CPT) for evaluating the inhibition and sustained attention.
Results showed that talented youth soccer players scored highest on inhibition And sustained attention task (p Results provide support for the prevailing notion that talented soccer players had higher inhibition and sustained attention ability that could be due to the fact that exercise and physical activity can positively impact cognitive functioning and as a result of that¡ talented soccer players due to their Proficiency in paying attention to the ball and Inhibition of Actions¡ perform better. there was also no statistically significant difference between two groups on cognitive flexibility that could be due to the intelligence differences between two group that is not considered in the present study

Synchronization in activated regions of cortical networks affect the brain’s frequency response, which has been associated with a wide range of states and abilities, including memory. This study aimed to determine the effectiveness of brainwave synchronization in beta band by binaural beats on improvement of visuospatial working memory in subjects with borderline personality disorder traits.
The present quasi-experimental study designed with a pre-test and post-test control group. In this regard, 30 college student with Borderline personality traits were chosen by borderline personality inventory (BPI), and randomly divided into two groups of experimental and control(each N=15). All subjects were evaluated with the Corsi Blocks Test in pre-test and post-test stages. The participants in experiment group received 15 Hz binaural beats for 12 minutes. The data were analyzed with ANCOVA.
Results demonstrated that 15 Hz binaural beats produce significant improvements in visuospatial working memory in subjects with borderline personality disorder traits (p Due to the importance of working memory in many daily activities and its deficit in borderline personality disorder, using 15 Hz binaural beats can promote visuospatial working memory in this subjects.

Visuospatial skills are among cognitive functions, which play important role in everyday life. One of the aims of this research in the field of spatial skills, is to investigate the ability to increase these skills. The purposes of the current research was to determine the effect of neuropsychological mental rotation exercises on the visuospatial function in the university students.
The method of this experimental study was pretest-posttest design. The statistical population was all students (age, 20-24 years) of Azarbaijan Shahid Madani University in academic year 2015-2016. Statistical sample included 30 male students, who were selected using random sampling and divided into two groups of experimental and control (each N=15). To collect data, the computerized version of Shepard and Metzler’s mental rotation tasks and mitsushina's Judgment of Line Orientation Task were used.
In this study, neuropsychological mental rotation exercises had significant effect on both mental rotation ability (p The results of this study was indicative of significant effect of neuropsychological mental rotation exercises on mental rotation ability and visuospatial function in the university students, which can be used to design future educational curricula, aiming at improved academic function.

Disorders of cognitive functions are considered as the components of the Attention Deficit and Hyperactivity Disorder (ADHD). Neuropsychological functions could be remediated by neuropsychological and cognitive rehabilitation exercise. This study aimed to determine the effectiveness of combination neuropsychological rehabilitation on cognitive and behavioral function of children with ADHD.
The present quasi-experimental study designed with a pre-test and post-test group. Participants were twelve children with ADHD and they were in 7-13 age range. They were evaluated with the Conners’ Parents Questionnaire and Continuous Performance Test II. The participants received neuropsychological rehabilitation in 10 sessions. The data were analyzed with paired t-test.
It was revealed that there were significant differences between scores of pre-test and post- test in Conners’ Parents Questionnaire (p The results of this study indicated that combination of neuropsychological rehabilitation leads to the improvement of sustained attention and inhibition by affecting the related brain areas. Also, improvement of this cognitive functions reduce behavioral symptoms of ADHD.

Brain imaging studies have shown reduced activity in the frontal lobe in OCD patients. The aim of this study is compare functions of dorso-lateral prefrontal cortex and orbitofrontal cortex in OCD patients, obsessive beliefs group, and healthy group.
21 college student with OCD, 21 college student with obsessive beliefs, and 22 normal college student were chosen by Madzeli obsessive- compulsive questionnaire, and OBQ-44 test. WCST and CPT tasks was performed on all subjects in 3 groups.
The data analysis showed that there were significant differences between OCD group, obsessive beliefs group, and healthy group in CPT variables(omission and commission error). There were not significant differences between OCD group, Obsessive Beliefs group, and healthy group in WCST variable(perseveration error).
Obsessive-compulsive patients show deficits in orbitofrontal function, while this deficits have not seen in Obsessive Beliefs group and healthy group.