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The effects of attention on the MOCS as measured by TEOAE suppression

Amirullah, Nur Afiqah and Rahmat, Sarah and Dzulkarnain, Ahmad Aidil Arafat (2021) The effects of attention on the MOCS as measured by TEOAE suppression. In: International Evoked Response Audiometry Study Group Biennial Symposium 2021, 14 Jun-9 Jul 2021, Virtual. (Unpublished)

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Abstract

Background: Among the functions of the medial olivocochlear system (MOCS) are to protect the auditory system against excessive noise, to aid in listening in noise, and to aid in selective attention. This system can be activated by presenting acoustic suppressor signals (such as broadband noise, BBN) to the ear, and its activity can me measured using various tests, including otoacoustic emission (OAE) suppression. Previous works have suggested that attention state was affecting the OAE supression in adult (Cone, 2009). However, the effects of attention state on the measurement of OAE supression in children is poorly understood. The current study therefore aims to investigate the effects of attention on the MOCS activity via transient OAE (TEOAE) suppression measured in the inattentive versus attentive state among children. Methods: 11 normal hearing school-age children (aged between 8-11) participated in this study. Contralateral TEOAE suppressions were performed in the presence of BBN at 60 dBA at 1,000, 1,400, 2,000, 2,800, and 4,000 Hz in two conditions: inattentive state and attentive state. Subjects were asked to relax and sit still during the inattentive state. In the attentive state, subjects were asked to complete several working memory modules while TEOAE suppressions were being measured. Both conditions were repeated 5 more times using 5 other acoustic suppressor signals (2 Quranic recitations and 3 nature sounds), all presented at 60 dBA. Results: A large effect size (indicated by the partial eta squared (η2) value of 0.18) was found between the TEOAE suppressions obtained in the inattentive and the attentive states. Descriptive analyses showed more enhancement effects in the inattentive condition compared to the attentive condition, especially at the higher frequencies. TEOAE suppression magnitudes were larger for all suppressor signals at all tested frequencies during the attentive condition than the inattentive condition. Conclusion: The higher OAE suppressions were observed during the attentive state than during the inattentive state indicates that attention could enhance the MOCS activity. The attention state of the subject has to be taken into account when measuring TEOAE suppressions.

Item Type: Conference or Workshop Item (Poster)
Uncontrolled Keywords: MOCS, TEOAE suppression, attention
Subjects: R Medicine > RF Otorhinolaryngology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Allied Health Sciences
Kulliyyah of Allied Health Sciences > Department of Audiology and Speech-Language Pathology
Depositing User: Dr Ahmad Aidil Arafat Dzulkarnain
Date Deposited: 12 Jul 2021 09:28
Last Modified: 12 Jul 2021 09:28
URI: http://irep.iium.edu.my/id/eprint/90751

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