Advances in effect of unilateral auditory deprivation on sound localization
10.3760/cma.j.issn.1673-0860.2017.02.018
- VernacularTitle: 单侧听觉剥夺对声源定位通路影响的研究进展
- Author:
Jinfeng LIU
1
,
2
,
3
;
Jinsheng DAI
1
,
2
,
3
;
Ningyu WANG
1
,
2
,
3
Author Information
1. Department of Otorhinolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University
2. College of Otolaryngology, Capital Medical University
3. Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing 100020, China
- Publication Type:Review
- Keywords:
Hearing Loss, unilateral;
Auditory deprivation;
Sound localization;
Neuronal plasticity
- From:
Chinese Journal of Otorhinolaryngology Head and Neck Surgery
2017;52(2):136-142
- CountryChina
- Language:Chinese
-
Abstract:
In patients with single-sided deafness (SSD), the interaural time difference and the interaural level difference signals are insufficient or missing, which result in the lack of sound localization ability and the decrease of speech comprehension in the noise environments. SSD can also cause the morphological and functional changes of the central auditory system, resulting in auditory deprivation. In early stage of the development, the auditory center is more susceptible to ambient environment and auditory inputs. It is a critical period of auditory function and morphological refinement. It is also sensitive period of central adaptability after auditory deprivation. SSD in the sensitive period of development can cause significant laterality activities of bilateral sound localization pathway. Unilateral auditory deprivation can distort tonotopic maps, disrupt the binaural integration, reorganize the neural network and change the synaptic transmission in the primary auditory cortex or sub cortex. In order to compensate for the deficiency of the interaural time difference and interaural level difference cues, the auditory pathway is used to improve the ability of sound source localization by using the spectral-shape cues remaining unchanged. In order to improve the effectiveness of the functional areas of the cortex, auditory center is also reorganized by cross-modal. However, central compensation after SSD is a double-edged sword. If SSD onset in the sensitive period, the laterality of auditory pathway will be continued and difficult to reverse by even long term bilateral hearing in the post-sensitive period. Therefore, in order to improve the understanding of the characteristics of unilateral auditory deprivation, this paper reviewed the evidence for adaptive changes in spatial hearing following a developmental hearing loss in one ear.
