Introduction. One of the symptoms of Attention Deficit Hyperactivity Disorder is an impaired ability to inhibit distracters. Previous research has indicated that cognitive training can lead to improvements in executive functiondependent tasks such as those involving working memory and inhibition. The aim of the present study was to test the outcomes of a series computerized training programs that was developed by the researchers for improving performance on working memory and inhibition tasks among prison inmates with ADHD.Materials and Methods. Through randomized sampling method, 20 adult male prison inmates (22-41 years old) inGorgan State Prison (North of Iran), who had previously been diagnosed with ADHD, were recruited on a voluntary basis. Participants were randomly assigned to an experimental group who received a computerized behavioral inhibition training program for 25 sessions through 5 weeks, or to a passive control group. The training programs comprised 4 modified tasks related to behavioral inhibition: Go-No-Go task, stop signal task, number Stroop task, and Flanker Arrow task. Go-No-Go test, classic Stroop test, Stop Signal test, Digit Span from the Wechsler Adult Intelligence Scale, and Corsi Block Tapping task were used for pre- and post-training assessments of executive cognitive function. Results. The experimental participants reported significant change (p <0.05) on verbal and nonverbal working memory tasks. But no significant change was reported on inhibition tasks (p >0.05). Conclusion. The results suggest that behavioral inhibition training did not lead to improvement on inhibition tasks,but it had significant effects on working memory tasks. This finding may indicate that inhibition training can lead to improvements in controlled attention and thereby improve performance on the tasks that require controlled attention, but does not lead to positive outcomes on tasks that require automatic processes.

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