Research Article

Development of the Persian single dichotic digit test and its reliability in 7-9 year old male students


Background and Aim: Although double dichotic digit test is a useful tool for assessing the central auditory system in adults, it is more useful for evaluating younger children. The present study aimed to develop the Persian version of the single dichotic digit test and to obtain initial normative data.
Methods: The Persian version of the present test consisted of three different sets of 25 single digit pairs for testing in the free recall, directed recall to right, and directed recall to left conditions. The digits in each list were recorded dichotically on a compact disc. The sectional study was performed on 126 male students, aged between 7 and 9. The test-retest reliability was assessed in 29 subjects two to four weeks after the first test session.
Results: In seven year olds, the mean right and left ear scores increased from around 95.79% and
89.69%, respectively. In eight year olds, the mean right and left ear scores increased from around 98.59% and 96.29%, respectively. The mean right ear advantage decreased from around 6.13% in 7 year olds to around 2% in 8 year olds (p=0.001). No significant difference was found in scores between the free recall and directed recall conditions (p>0.05). The test had a high test-retest reliability (p>0.05).
Conclusion: The Persian version of the test has a high test-retest reliability for evaluating male children aged between 7 and 9; it can be used for assessing binaural integration in male children of this age group.

1. Tillary K. Central auditory processing evaluation. In: Katz J. Handbook of clinical audiology. 6th ed. Baltimore: Lippincott Williams & Wilkins; 2009. 627-41.
2. Geffner D, Ross-Swain D. Auditory processing disorders, assessment, management and treatment. 1st ed. United Kingdom: Plural Publishing Inc; 2007.
3. Fuente A, McPherson B, Chiang LP, Tang CH. Cantonese dichotic digit test: test creation and normative values for children and adults. Asia Pac J Speech Lang Hear.
4. 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.
5. Martin JS, Jerger JF. Some effects of aging on central auditory processing. J Rehabil Res Dev. 2005;42(4 Suppl 2):25-44.
6. Gootjes L, Van Strien JW, Bouma A. Age effects in identifying and localising dichotic stimuli: a corpus callosum deficit? J Clin Exp Neuropsychol. 2004;26(6):826-37.
7. 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.
8. Moncrieff DW. Dichotic listening in children: age-related changes in direction and magnitude of ear advantage. Brain Cogn. 2011;76(2):316-22.
9. Fuente A, McPherson B. Auditory processing tests for Spanish-speaking adults: an initial study. Int J Audiol. 2006;45(11):645-59.
10. Ozimek E, Kutzner D, Sęk A, Wicher A. Development and evaluation of Polish digit triplet test for auditory screening. Speech Commun. 2009;51(4):307-16.
11. Chislom TH, Willott JF, Lister JJ. The aging auditory system: anatomic and physiologic changes and implications for rehabilitation. Int J Audiol. 2003;42 Suppl 2:2S3-10.
12. Bellis TJ, Wilber LA. Effects of aging and gender on interhemispheric function. J Speech Lang Hear Res. 2001;44(2):246-63.
13. Bamiou DE, Sisodiya S, Musiek FE, Luxon LM. The role of the interhemispheric pathway in hearing. Brain Res Rev. 2007;56(1):170-82.
Westerhausen R, Hugdahl K. The corpus callosum in dichotic listening studies of hemispheric asymmetry: A review of clinical and experimental evidence. Neurosci Biobehav Rev. 2008;32(5):1044-54.
IssueVol 23 No 5 (2014) QRcode
SectionResearch Article(s)
Dichotic digit test central auditory processing children ear advantage

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How to Cite
Rajabpur E, Hajiablohasan F, Tahai SA-A, Jalaie S. Development of the Persian single dichotic digit test and its reliability in 7-9 year old male students. Aud Vestib Res. 23(5):68-77.