Tehran University of Medical Sciences Auditory and Vestibular Research 2423-480X 21 4 2017 07 31 76 83 Sima Tajik Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Iran Mansoureh Adel Ghahraman Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Iran Ali Akbar Tahaie Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Iran Fahimeh Hajiabolhassan Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Iran Leila Jalilvand Karimi Department of Audiology, Faculty of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran Shohreh Jalaie Department of Biostatistics, School of Rehabilitation, Tehran University of Medical Sciences, Iran 2017 06 18 Background and Aim: Auditory temporal processing reveals an important aspect of auditory performance, in which a deficit can prevent the child from speaking, language learning and reading. Temporal resolution, which is a subgroup of temporal processing, can be evaluated by gap-in-noise detection test. Regarding the relation of auditory temporal processing deficits and phonologic disorder of children with dyslexia-dysgraphia, the aim of this study was to evaluate these children with the gapin-noise (GIN) test. Methods: The gap-in-noise test was performed on 28 normal and 24 dyslexic-dysgraphic children, at the age of 11-12 years old. Mean approximate threshold and percent of corrected answers were compared between the groups. Results: The mean approximate threshold and percent of corrected answers of the right and left ear had no significant difference between the groups (p>0.05). The mean approximate threshold of children with dyslexia-dysgraphia (6.97 ms, SD=1.09) was significantly (p<0.001) more than that of the normal group (5.05 ms, SD=0.92). The mean related frequency of corrected answers (58.05, SD=4.98%) was less than normal group (69.97, SD=7.16%) (p<0.001). Conclusion: Abnormal temporal resolution was found in children with dyslexia-dysgraphia based on gap-in-noise test. While the brainstem and auditory cortex are responsible for auditory temporal processing, probably the structural and functional differences of these areas in normal and dyslexicdysgraphic children lead to abnormal coding of auditory temporal information. As a result, auditory temporal processing is inevitable. https://avr.tums.ac.ir/index.php/avr/article/view/496