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Abstract Aim and Background: The purpose of the current study is to examine the performance of children with and without AD/HD in time reproduction tasks involving varying durations and modalities. Methods and Materials: A group of 15 children with AD/HD from a pediatric psychiatric clinic and 15 normal children group from two schools in Mashhad were selected by using an ADHD rating scale and Conners’ parents scale. They performed time reproduction tasks in three modalities (auditory, visual, and combined auditory/visual condition) each during six durations (6, 12, 18, 24, 36, and 48 seconds). Findings: As expected, the ADHD group performed weaker in the time duration tasks. However, for varying modalities the performance of two groups weren’t meaningfully different. Furthermore, the difference in performance between two groups prolonged as temporal duration increased.Nevertheless, we observed no interaction between groups and modalities. Conclusions: For longer time durations the ADHD group performs less accurate than the other group. Still, the performance is not affected when the modality is changed.  

Keywords: ADHD, Time Perception, Modality Effect, Duration, Time Reproduction Task.

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