Aim: Drug addiction causes many of brain dysfunctions and intellectual abnormalities so that its problem should be addressed. Hence, this study is aimed at comparing executive functions among drug-dependent, in abstinence, and normal individuals in Tehran. Methodology: Research method is descriptive-comparative. Studied samples consisted of men chosen from addiction treatment centers in Tehran, using random sampling method. Members of normal groups consisted of 25 normal people without any experience of opiates use; drug user group consisted of 25 drug-dependent patients; and group of in abstinence individuals consisted of 25 members who had been drug abusers before but were under treatment during this study. To compare executive functions of the brain of these three groups, Letter-Number Sequence Test and Wisconsin Card Sorting Test were used. Results: Drug users had lower function compared with normal but had a better function compared with in-abstinence groups in Wisconsin Card Sorting Test. in Letters-Digits Sequence Test, normal group have better performance than two other groups significantly; whereas, among two drug user and in-abstinence groups, drug users significantly performed better than in-abstinence group. Also. this current study showed that there is a relationship between substance use duration and low executive functions of brain (P<0.01). Conclusion: Drug users have lower function compared with normal and in-abstinence groups in Wisconsin Card Sorting and Letters-Digits Sequence test. Moreover, short-term deprivation from drugs correlate with lower executive function of brain in cognitive tasks.
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