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:: Volume 21, Issue 4 (19 2012) ::
aud 2012, 21(4): 76-83 Back to browse issues page
Deficit of auditory temporal processing in children with dyslexia-dysgraphia
Sima Tajik1, Mansoureh Adel Ghahraman 1, Ali Akbar Tahaie1, Fahimeh Hajiabolhassan1, Leila Jalilvand Karimi2, Shohreh Jalaie3
1- Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Iran
2- Department of Audiology, Faculty of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3- Department of Biostatistics, School of Rehabilitation, Tehran University of Medical Sciences, Iran
Abstract:   (10266 Views)

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 gap-in-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 dyslexic-dysgraphic children lead to abnormal coding of auditory temporal information. As a result, auditory temporal processing is inevitable.

Keywords: Auditory temporal processing, gap-in-noise test, dyslexia, dysgraphia, learning disability
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Type of Study: Research |
Received: 2012/03/12 | Accepted: 2012/07/23 | Published: 2013/10/15
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Volume 21, Issue 4 (19 2012) Back to browse issues page
شنوایی شناسی - دانشگاه علوم پزشکی تهران Bimonthly Audiology - Tehran University of Medical Sciences
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