Research Article

Inter-list equivalency and reliability of the Persian randomized dichotic digits test

Abstract

Background and Aim: Dichotic listening evaluation is one of the most common behavioral procedures for assessing the cerebral dominance of language and is considered as the main component of the auditory processing test battery in children and adults. The randomized dichotic digits test (RDDT) has two lists of randomly distributed one-, two-, and three-digit items. This research was performed for studying the inter-list equivalency and test-retest reliability of Persian RDDT.
Methods: Persian RDDT was administered at 50 dBHL on 62 right-handed individuals (equal sex ratio) with normal hearing sensitivity in the age range of 12-45 years. The interval between the test sessions was 30 days and each session had two test rounds with an interval of 20 minutes. In each session, list 1 of the Persian RDDT was performed for the first round and list 2 performed for the second round.
Results: Results demonstrated that mean right and left ear score and ear advantage of Persian RDDT list 1 and list 2 had no statistically significant difference (right ear p=0.25, left ear p=0.56, ear advantage: p=0.6). Intra-class correlation coefficient of scores in the first and the third test rounds (list 1) for the right and left ears were 0.71 and 0.68, and for the second and the fourth test rounds (list 2) were 0.69 and 0.80, respectively.
Conclusion: Based on the results of this study, it would seem that the two lists of Persian RDDT are equivalent and the mean scores have good to excellent test-retest reliability.

1. Keith RW, Anderson J. Dichotic listening tests. In: Museik FE, Chermak GD, editors. Handbook of (central) Auditory Processing Disorder: Auditory neuroscience and diagnosis, Volume 1. 1st ed. San Diego: Plural Publishing Inc; 2007. p. 207-30.
2. Musiek FE. Assessment of central auditory dysfunction: the dichotic digit test revisited. Ear Hear. 1983 Mar-Apr;4(2):79-83.
3. 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.
4. Mukari SZ, Keith RW, Tharpe AM, Johnson CD. Development and standardization of single and double dichotic digit test in the Malay language. Int J Audiol. 2006;45(6):344-52.
5. Moncrieff DW, Wilson RH. Recognition of randomly presented one-, two-, and three-pair dichotic digits by children and young adults. J Am Acad Audiol. 2009;20(1):58-70.
6. Mahdavi ME, Aghazadeh J, Tahaei SAA, Heiran F, Akbarzadeh Baghban A. Persian randomized dichotic digits test: Development and dichotic listening performance in young adults. Audiol. 2015;23(6):99-113. Persian.
7. Strouse A, Wilson RH. recognition of one-, two-, and three-pair dichotic digits under free and directed recall.. J Am Acad Audiol. 1999 ;10(10):557-71.
8. Alipour A. The reliability and validity of chapman's handedness inventory in junior high school students. Journal of Iranian Psychologists. 2006;2(7):197-205. Persian.
9. Stockley KB, Green WB. Interlist equivalency of the Northwestern University Auditory Test No. 6 in quiet and noise with adult hearing-impaired individuals. J Am Acad Audiol. 2000;11(2):91-6.
10. Hugdahl K. Dichotic listening in the study of auditory laterality. In: Hugdahl K, Davidson RJ, editors. The asymmetrical brain. 2nd ed. London: MIT Press; 2004. p. 441-75.
11. Voyer D. Sex differences in dichotic listening. Brain Cogn. 2011;76(2):245-55.
12. Moncrieff DW. Dichotic listening in children: age-related changes in direction and magnitude of ear advantage. Brain Cogn. 2011;76(2):316-22.
13. Meyers JE, Roberts RJ, Bayless JD, Volkert K, Evitts PE. Dichotic listening: Expanded norms and clinical application. Arch Clin Neuropsychol. 2002 Jan;17(1):79-90.
14. Strouse A, Wilson RH. Stimulus length uncertainty with dichotic digit recognition. J Am Acad Audiol. 1999;10(4):219-29.
15. Weir JP. Quantifying test-retest reliability using the intraclass correlation coefficient and the SEM. J Strength Cond Res. 2005;19(1):231-40.
16. Bakker DJ, Van der Vlugt H, Claushuis M. The reliability of dichotic ear asymmetry in normal children. Neuropsychologia. 1978;16(6):753-7.
17. Blumstein S, Goodglass H, Tartter V. The reliability of ear advantage in dichotic listening. Brain Lang. 1975 Apr;2(2):226-36.
18. Ryan WJ, McNeil M. Letter: Letter: Listener reliability for a dichotic task. J Acoust Soc Am. 1974;56(6):1922-3.
19. Strauss E, Sherman EMS, Spreen O. A compendium of neuropsychological tests: administration, norms, and commentary. 3rd ed. New York: Oxford University Press; 2006.
20. Cicchetti DV. Guidelines, criteria, and rules of thumb for evaluating normed and standardized assessment instruments in psychology. Psychol Assess. 1994;6(4):284-90.
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IssueVol 24 No 2 (2015) QRcode
SectionResearch Article(s)
Keywords
Randomized dichotic digits test Persian list equivalency reliability
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How to Cite
1.
Aghazadeh J, Mahdavi ME, Tahaei AA, Tabatabaee SM. Inter-list equivalency and reliability of the Persian randomized dichotic digits test. Aud Vestib Res. 2015;24(2):71-79.