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:: Volume 19, Issue 1 (21 2010) ::
aud 2010, 19(1): 50-56 Back to browse issues page
The effect of contralateral noise stimulation on difference limen for intensity
Maryam Delphi1, Seyyed Ali Akbar Tahaei1
1- Department of Audiology, Faculty of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
Abstract:   (9594 Views)

Background and Aim: Contralateral stimulation with noise can improve auditory intensity discrimination. This may be related to function of the efferent system. The purpose of this study was to determine the relationship between the auditory intensity discrimination and the efferent system function.
Methods: Twenty students with normal hearing were included in this descriptive-analytic study. We examined Difference Limen for Intensity (DLI), Otoacoustic Emissions suppression and Speech In Noise. DLI was evaluated with and without contralateral noise stimulation at two different stimulus levels (20, 70 dB SL).
Results: There was significant difference between mean DLI scores of with contralateral masking comparing to without it, which was more prominent as frequency increased. Mean DLI score while masking with white noise was more than mean scores when masking with narrow band noise (p<0.05). Transient evoked otoacoustic emissions responses decreased significantly in amplitude with contralateral masking. (p<0.05)
Conclusion: These results suggest that medial olivocochlear bundle functions as a key role in auditory intensity discrimination.

Keywords: Contralateral stimulation, efferent system, intensity discrimination
Full-Text [PDF 181 kb]   (3405 Downloads)    
Type of Study: Research |
Received: 2009/03/14 | Accepted: 2009/10/25 | Published: 2013/10/12
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Volume 19, Issue 1 (21 2010) Back to browse issues page
شنوایی شناسی - دانشگاه علوم پزشکی تهران Bimonthly Audiology - Tehran University of Medical Sciences
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