Research Article

Development and evaluation of the reliability of Persian version of double dichotic digit test in girls aged 7 to 11 years


Background and Aim: The double dichotic digit test (DDT) is a simple test for assessing and screening auditory processing system. The purpose of this study was to develope a double DDT, in Persian language and find its basic norm values in girls aged 7 to 11 years.
Methods: The Persian version of double DDT is composed of 3 different 25 numerical lists. Numbers in each list were recorded dichotically. The present cross‐sectional study was performed on 200 girls aged 7 to 11 years. Test-retest reliability was assessed in 30 of the study subjects.
Results: The mean scores of the right and left ears in the free recall condition increased from 92.33 and 86 percent in 7 year olds to 99.75 and 98.16 percent in 11 year olds and in the directed condition from 95 and 88.80 percent in 7 year olds to 100 and 98.41 percent in 11 year olds. In the free recall condition the right ear advantage value decreased from 6.33 percent in 7 year olds to 1.58 percent in 11 year olds, respectively and in directed recall condition, decreased from 6.91 percent in 7 year olds to 1.59 percent in 11 year olds. The test has as high consistency reliability (p>0.05).
Conclusion: According to results of the present study, the Persian version of the double DDT has suitable reliability for assessing the central auditory processing system in 7 to 11 year old girls.

1. Shinn JB, Baran JA, Moncrieff DW, Musiek FE. Differential attention effects on dichotic listening. J Am Acad Audiol. 2005;16(4):205-18.
2. Marculino CF, Rabelo CM, Schochat E. Gaps-in-noise test: gap detection thresholds in 9-year-old normal-hearing children. J Soc Bras Fonoaudiol. 2011;23(4):364-7.
3. Mukari SZ, Keith RW, Tharpe AM, Johnson CD. Development and standardization of single and double dichotic digit tests in the Malay language. Int J Audiol. 2006;45(6):344-52.
4. Findlen UM, Roup CM. Dichotic speech recognition using CVC word and nonsense CVC syllable stimuli. J Am Acad Audiol. 2011;22(1):13-22.
5. Elliott EM, Bhagat SP, Lynn SD. Can children with (central) auditory processing disorders ignore irrelevant sounds? Res Dev Disabil. 2007;28(5):506-17.
6. Rajabpur E, Hajiablohasan F, Tahai SA , Jalaie S. Development of the Persian single dichotic digit test and its reliability in 7-9 year old male students. Audiol. 2013;23(5):68-77. Persian.
7. Jutras B, Mayer D, Joannette E, Carrier ME, Chénard G. Assessing the development of binaural integration ability with the French dichotic digit test: Ecoute Dichotique de Chiffres. Am J Audiol. 2012;21(1):51-9.
8. Carter AS, Wilson RH. The effect of filtering and inter-digit interval on the recognition of dichotic digits. J Rehabil Res Dev. 2000;37(5):599-606.
9. Westerhausen R, Moosmann M, Alho K, Medvedev S, Hämäläinen H, Hugdahl K. Top-down and bottom-up interaction: manipulating the dichotic listening ear advantage. Brain Res. 2009;1250:183-9.
10. Bamiou DE, Sisodiya S, Musiek FE, Luxon LM. The role of the interhemispheric pathway in hearing. Brain Res Rev. 2007;56(1):170-82.
IssueVol 24 No 3 (2015) QRcode
SectionResearch Article(s)
Double dichotic digit test ear advantage central auditory processing children

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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
How to Cite
Shahmir B, Hajiabolhassan F, Mohammadkhani G, Tahaei AA, Jalaie S. Development and evaluation of the reliability of Persian version of double dichotic digit test in girls aged 7 to 11 years. Aud Vestib Res. 24(3):164-170.