فصلنامه روانشناسی شناختی

The proposed link between brain laterality and individual differences in cognitive tasks provided the theoretical foundation for the present study. The main purpose of this study was to investigate this potential link, specifically between one aspect of brain function, namely hand dominance, and one type of cognitive task, namely the ability to perceive short intervals of time. The sample included 40 girls and 40 boys left hands and 40 girls and 40 boys right hands in school students fasa city  that were selected  with the help of the Edinburgh Handedness Inventory and also time Perception  measured  with  four methods of production, reproduction, verbal estimation and comparison by standard software .Regression analysis showed that age predicted negatively and significantly time perception to the measuring verbal estimation and production method. Handedness was positively and significantly predicted measuring verbal estimation method time perception. Logistic regression results also showed that Handedness predicted the time perception the measuring comparison method. In this study  , not showed significantly different between the sexes. Summarizes the results show that right-handed people than left-handers to perceive higher intervals of time but at the time discrepancies are close to each other have more wrong.  

Since working memory capacity (WMC) predicts individual differences in the wide range of abilities, this experiment tested the effect of WMC on time perception in preschool children.
At first, 108 children’s working memory capacity were measured by CANTAB tests and then 21 children with high working memory capacity and 20 children with low working memory capacity were assigned. Then, both groups performed two reproduction tasks they instructed to reproduce 700 and 3000 millisecond intervals in mono task, and to reproduce 3000 ms with a performing concurrent non-temporal task as a dual task. Data analyzed by mixed design ANOVA and post hoc tests. Results showed that in mono task, accuracy of high WMC was better than the low WMC group. In dual task, although there was no significant difference in the accuracy of reproduction task, children with high WMC had better performance in non-temporal task. Furthermore, children with low WMC were more variable performance than high WMC in all intervals.
 

The present research aims to compare the cognitive performance of the adolescents suffering from MDD and PTSD in the working memory and information processing. the selected sample in this casual-comparative study included 15 MDD patients, 15 youth PTSD subjects and 15 normal subjects who were matched by age, IQ, sex as well as social and economic status variables. The tool package employed in this investigation comprised child depression inventory (CDI), State-Trait Anxiety Inventory, Impact of Event Scale (IES-R), Wechsler’s Memory and Intelligence Test, and The Information Processing Index Test. Findings were analyzed using the ANOVA, MANOVA analysis statistical method.as indicated by our result, in the verbal memory there is a significant difference between groups of depression and PTSD and between depressed and normal subjects. in the reverse spatial working memory there are significant differences between normal and PTSD. in the visual memory and information processing, the significant difference is between normal and both PTSD and depressed.The findings of this study confirm the disorders of working memory and speed of information processing in adolescents with depression and post-traumatic stress disorder.