The aim of the present study was to investigate dual task performance in pessimist and optimist participants. To test for this, two hundred fifty participants were screened via life orientation test. Twenty participants were selected from top quartiles of pessimism and optimism. In addition, participants with higher depression and with history of past or current psychiatric and neurologic disorders were eliminated based on Beck depression inventory and psychiatric and neurologic screening test. In the final case, 20 participants from each group were performed three tasks which are single tasks, dual tasks with 1000 ms. and dual task with 0 SOA manipulations. The results showed that individuals who scored higher on pessimism scale were considerably slowing down as compared to individuals who scored higher on optimism scale as task demand increase from single task to dual task with 0 SOA. It has been concluded that pessimism may impair central executive functions during dual task processing.

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