دکتر پرویز ملک زاده

In this research, the effect of oil price shock on the return of the Iranian stock market has been evaluated using a new quantile-on-quantile approach. To do this, first, the oil price shock has been calculated using the structural vector autoregression method, and then the effect of the oil price shock on the return of the Iranian stock market has been investigated using the quantile-on-quantile approach. The statistical population consists of the data related to oil variables and the stock price index of the Iranian stock market. The statistical sample includes 200 observations of the monthly data related to the oil variables and the stock price index of the Iranian stock market during the period of 1385: 1 -1401: 12. The results of this research show that the effect of the oil price shock on the Iranian stock market varies across different quantiles of the Iranian stock market returns. A negative oil price shock has a larger effect on stock market returns when the stock market is bullish. Also, in the normal state of the stock market, a positive oil price shock has a large negative effect on stock market returns. Based on these observations, it is concluded that the relationship between oil price and stock market returns can depend on the nature of oil price shocks and the performance of the stock market.

Anxiety is known as a common problem in the general population. The aim of this study was to investigate the effect of Mindfulness-based cognitive therapy on working memory and problem solving.

A randomized controlled trial design was selected. The study population included all students between 20 and 30 years old in Tehran, from which 26 subjects were selected based on inclusion and exclusion criteria and randomly divided to experimental and control groups. Subjects in each group were tested before and after the intervention (8 sessions of MBCT) and in the follow-up phase (3 months) with the tools of the Tower of London (computer -based), Forward-backward Digit Span, Letter Number Sequencing test, as well as, the Beck's Anxiety Questionnaire.

results of MANCOVA showed that the experimental group was significantly different from the control group in the post-test and follow-up stages in working memory and anxiety. Significantly differences were found between the two groups for problem solving in the indicators of trial time, total time, number of errors and the number of correct trials, whereas no difference observed for planning time in problem solving.

According to the findings of this study, MBCT training through anxiety reduction can improve working memory capacity and problem solving components except the planning time.