| 双耳条件下超前声对人分辨滞后声强度的影响 |
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| 引用本文： | 高菲,孙心德,张季平.双耳条件下超前声对人分辨滞后声强度的影响[J].生物化学与生物物理进展,2011,38(2):142-150. |
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| 作者姓名： | 高菲 孙心德 张季平 |
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| 作者单位： | 脑功能基因组学教育部重点实验室，上海市脑功能基因组学重点实验室，华东师范大学生命科学学院，上海 200062;脑功能基因组学教育部重点实验室，上海市脑功能基因组学重点实验室，华东师范大学生命科学学院，上海 200062;脑功能基因组学教育部重点实验室，上海市脑功能基因组学重点实验室，华东师范大学生命科学学院，上海 200062 |
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| 基金项目： | 国家自然科学基金资助项目(30970984)和教育部新世纪优秀人才支持计划项目(NCET-07-0298) |
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| 摘 要： | 在复杂声环境中,对声音强度的分辨是听觉系统对声音信号精确处理的重要功能之一.到目前为止,有关人对声音强度分辨的研究都是在单耳条件下进行的,然而,正常条件下人都是利用双耳感知强度和方位变化的声音.以人对声刺激强度的最小可察觉差异(just noticeable difference,JND)为强度分辨阈值的指标,观察双耳条件下超前声对人分辨滞后声强度的影响.实验在封闭声场中进行,声刺激强度和空间方位的控制是通过改变双耳平均声压(average binaural level,ABL)和双耳声压差(interaural level difference,ILD)来模拟的.实验结果表明,与安静条件下人对声刺激强度的分辨阈值相比,低强度的超前声对人分辨滞后声强度的阈值无显著影响,而中等及以上强度(ABL大于或等于40 dB)的超前声可提高人分辨滞后声强度的阈值,阈值的提高随超前声强度的增加呈单调增大的趋势.当超前声强度一定时,超前声对人分辨滞后声强度的影响随滞后声强度的增加而衰减,对分辨较高强度的滞后声的阈值影响不显著,该结果与单耳的研究结果有明显差异.实验未发现超前声和滞后声ILD的相对改变对人探测滞后声强度变化的阈值有显著影响.
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| 关 键 词： | 前掩蔽 声音强度分辨 最小可察觉差异 双耳平均声压 双耳声压差 |
| 收稿时间： | 2010/9/25 0:00:00 |
| 修稿时间： | 2010/11/1 0:00:00 |
The Effect of a Preceding Sound on The Level Discrimination of a Successive Sound in Binaural Conditions |
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| GAO Fei,SUN Xin-De and ZHANG Ji-Ping.The Effect of a Preceding Sound on The Level Discrimination of a Successive Sound in Binaural Conditions[J].Progress In Biochemistry and Biophysics,2011,38(2):142-150. |
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| Authors: | GAO Fei SUN Xin-De and ZHANG Ji-Ping |
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| Institution: | Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics,School of Life Science, East China Normal University, Shanghai 200062, China;Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics,School of Life Science, East China Normal University, Shanghai 200062, China;Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics,School of Life Science, East China Normal University, Shanghai 200062, China |
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| Abstract: | In a complex acoustical environment,the ability to discriminate the level of a sound is an important function of auditory system to accurately process sound signal information.Previous studies regarding human sound level discrimination were investigated in monaural condition.However,in natural acoustical environments,human discriminate sound level and spatial information binaurally.The effect of a preceding sound was determined upon the level discrimination of a successive sound by measuring the just notice... |
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| Keywords: | forward masking level discrimination just noticeable difference average binaural level interaural level difference |
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