Research Article

Persian version of the dichotic digit test for children: design and evaluation of the psychometric properties


Background and Aim: Dichotic digit test (DDT) is a valid neuropsychological tool for determining the dominant hemisphere in verbal processing; therefore, the main goal of this research was designing and investigating the psychometric properties of DDT in a sample of Iranian children and then measuring its concurrent validity using the n-back task.
Methods: The present study was a descriptive and psychometric research which was con­ducted using correlations. 144 children aged between 7-12 years were selected through pur­posive sampling. To collect data, a DDT which was designed based on the original Persian version of the main dichotic test and validated via the n-back test was also used. Data was analyzed, and the concurrent and descriptive validity of the test was determined using descriptive and inferential statistics as well as correlation and analysis of variance.
Result: Results showed that the DDT has acceptable and valid psychometric properties; the Cronbach's Alpha level of 79% shows the concurrent validity of this test. Meanwhile, with an increase in age, the scores at three measuring scales of this test, i.e. right ear, left ear, and differentiation scale also increased. There was no significant difference between the scores of male and female participants.
Conclusion: It was shown that the DDT which is known to reflect the hemispheric asymmetry in processing verbal information has appropriate psychometric properties among Iranian children, and proved to be applicable in various clinical and research conditions.

1. Broadbent DE. Perception and communication.1st ed. London: Pergamon Press; 1958.
2. Hugdahl K. Dichotic listening and language: overview. In: Wright JD, editor. International encyclopedia of the social & behavioral sciences. 2rd ed. Amsterdam: Elsevier; 2015. p. 357-67.
3. Gazzaniga MS, Ivry RB, Mangun GR. Cognitive neuroscience: the biology of the mind. 3rd ed. New York: W.W. Norton & Company; 2008.
4. Moncrieff DW. Dichotic listening in children: age-related changes in direction and magnitude of ear advantage. Brain Cogn. 2011;76(2):316-22.
5. Schmithorst VJ, Farah R, Keith RW. Left ear advantage in speech-related dichotic listening is not specific to auditory processing disorder in children: a machine-learning fMRI and DTI study. Neuroimage Clin. 2013;3:8-17.
6. Abosch A. Handbook of functional neuroimaging of cognition: Roberto Cabeza, Alan Kingstone (Eds.), The MIT Press, 2001, GBP 41.50, ISBN: 0-262-03280-5. J Chem Neuroanat. 2004;27(4):283-4.
7. Hugdahl K. Fifty years of dichotic listening research - still going and going and…. Brain Cogn. 2011;76(2):211-3.
8. Hugdahl K, Westerhausen R, Alho K, Medvedev S, Laine M, Hämäläinen H. Attention and cognitive control: unfolding the dichotic listening story. Scand J Psychol. 2009;50(1):11-22.
9. Moore DR, Ferguson MA, Edmondson-Jones AM, Ratib S, Riley A. Nature of auditory processing disorder in children. Pediatrics. Pediatrics. 2010;126(2):e382-90.
10. Hjelmervik H, Westerhausen R, Osnes B, Endresen CB, Hugdahl K, Hausmann M, et al. Language lateralization and cognitive control across the menstrual cycle assessed with a dichotic-listening paradigm. Psychoneuroendocrinology. 2012;37(11):1866-75.
11. Emanuel DC, Ficca KN, Korczak P. Survey of the diagnosis and management of auditory processing disorder. Am J Audiol. 2011;20(1):48-60.
12. Chen YN, Mitra S, Schlaghecken F. Sub-processes of working memory in the N-back task: an investigation using ERPs. Clin Neurophysiol. 2008;119(7):1546-59.
13. Hirnstein M, Westerhausen R, Korsnes MS, Hugdahl K. Sex differences in language asymmetry are age-dependent and small: a large-scale, consonant-vowel dichotic listening study with behavioral and fMRI data. Cortex. 2013;49(7):1910-21.
14. Knecht S, Dräger B, Deppe M, Bobe L, Lohmann H, Flöel A, et al. Handedness and hemispheric language dominance in healthy humans. Brain. 2000;123 Pt 12:2512-8.
15. Voyer D. Sex differences in dichotic listening. Brain Cogn. 2011;76(2):245-55.
16. Wasserman GA, Pine DS, Workman SB, Bruder GE. Dichotic listening deficits and the prediction of substance use in young boys. J Am Acad Child Adolesc Psychiatry. 1999;38(8):1032-9.
17. Bouma A, Gootjes L. Effects of attention on dichotic listening in elderly and patients with dementia of the Alzheimer type. Brain Cogn. 2011;76(2):286-93.
18. Hugdahl K, Nygård M, Falkenberg LE, Kompus K, Westerhausen R, Kroken R, et al. Failure of attention focus and cognitive control in schizophrenia patients with auditory verbal hallucinations: evidence from dichotic listening. Schizophr Res. 2013;147(2-3):301-9.
19. Saetrevik B, Specht K. Cognitive conflict and inhibition in primed dichotic listening. Brain Cogn. 2009;71(1):20-5.
20. Gadea M, Gómez C, González-Bono E, Espert R, Salvador A. Increased cortisol and decreased right ear advantage (REA) in dichotic listening following a negative mood induction. Psychoneuroendocrinology. 2005;30(2):129-38.
21. Hämäläinen H, Soveri A, Tallus J, Laine M, Tuomainen J, Nyberg L, et al. Training of executive functions: a dichotic listening (DL) study. Int J Psychophysiol. 2010;77(3):224-5.
22. Ikeda Y, Yahata N, Takahashi H, Koeda M, Asai K, Okubo Y, et al. Cerebral activation associated with speech sound discrimination during the diotic listening task: an fMRI study. Neurosci Res. 2010;67(1):65-71.
23. Falkenberg LE, Specht K, Westerhausen R. Attention and cognitive control networks assessed in a dichotic listening fMRI study. Brain Cogn. 2011;76(2):276-85.
24. Obrzut JE, Mahoney EB. Use of the dichotic listening technique with learning disabilities. Brain Cogn. 2011;76(2):323-31.
IssueVol 25 No 1 (2016) QRcode
SectionResearch Article(s)
Dichotic digit test children design psychometric properties validating

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How to Cite
Nejati V, Alipour F, Jalilvand Karimi L, Esfandiari L. Persian version of the dichotic digit test for children: design and evaluation of the psychometric properties. Aud Vestib Res. 25(1):55-62.