Introduction : Several factors have been shown to affect perceived durations in children.The present study evaluates the effect of different emotional images (positive, neutral, negative) on time perception in children with attention deficit hyperactivity disorder (ADHD) and normal children.

Methods: At first, a total number of 544 primary school students in Urmia were selected using a multistage cluster sampling method and then the Conners teacher rating scale (CTRS) was completed by teachers. 76 individuals were further assessed via the Children Symptom Inventory (CSI-4) by completing the parents. Furthemore, students performed continuous performance test (CPT). Finally, 30 students with attention deficit hyperactivity symptoms were identified. 29 students who have any symptoms were selected as a control group. Both groups were administered time reproduction task containing emotinal images (positive, neutral, negative) in 900ms, 1000ms and 1100ms durations. Data were analyzed using repeated measurement analysis of variance.

 Results: Finding revealed that the main effect group was significant (p<0/05) indicating that children with ADHD demonstrated more errors in time reproduction tasks. However, the interaction effect of emotional images and group was not significant (P=0.154).

Conclusion: These findings indicate that children with ADHD had worse performance in time perception of all emotional stumuli.