Research Article| Volume 25, ISSUE 6, P1403-1410, June 2016

Auditory Temporal Processing Deficits in Chronic Stroke: A Comparison of Brain Damage Lateralization Effect

  • Zahra Jafari
    Address correspondence to Zahra Jafari, PhD, Department of Basic Sciences in Rehabilitation, School of Rehabilitation Sciences, Iran University of Medical Sciences, Nezam Alley, Shahnazari St., Mother Sq., Mirdamad Blvd., Tehran, Iran, 15875-4391.
    Department of Basic Sciences in Rehabilitation, School of Rehabilitation Sciences, Iran University of Medical Sciences (IUMS), Tehran, Iran

    Canadian Center for Behavioral Neuroscience (CCBN), Lethbridge University, Lethbridge, Alberta, Canada

    Iranian Research Center on Aging, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran
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  • Mahdiye Esmaili
    Iranian Research Center on Aging, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran
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  • Ahmad Delbari
    Iranian Research Center on Aging, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran
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  • Masoud Mehrpour
    Department of Neurology, Firouzgar Hospital, Iran University of Medical Sciences (IUMS), Tehran, Iran
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  • Majid H. Mohajerani
    Canadian Center for Behavioral Neuroscience (CCBN), Lethbridge University, Lethbridge, Alberta, Canada
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      There have been a few reports about the effects of chronic stroke on auditory temporal processing abilities and no reports regarding the effects of brain damage lateralization on these abilities. Our study was performed on 2 groups of chronic stroke patients to compare the effects of hemispheric lateralization of brain damage and of age on auditory temporal processing.


      Seventy persons with normal hearing, including 25 normal controls, 25 stroke patients with damage to the right brain, and 20 stroke patients with damage to the left brain, without aphasia and with an age range of 31-71 years were studied. A gap-in-noise (GIN) test and a duration pattern test (DPT) were conducted for each participant.


      Significant differences were found between the 3 groups for GIN threshold, overall GIN percent score, and DPT percent score in both ears (P ≤ .001). For all stroke patients, performance in both GIN and DPT was poorer in the ear contralateral to the damaged hemisphere, which was significant in DPT and in 2 measures of GIN (P ≤ .046). Advanced age had a negative relationship with temporal processing abilities for all 3 groups.


      In cases of confirmed left- or right-side stroke involving auditory cerebrum damage, poorer auditory temporal processing is associated with the ear contralateral to the damaged cerebral hemisphere. Replication of our results and the use of GIN and DPT tests for the early diagnosis of auditory processing deficits and for monitoring the effects of aural rehabilitation interventions are recommended.

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