噪音方案在噪音中帮助听力
Jarrod M Hicks1,2,3, Josh H McDermott1,2,3,4
1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139.
概括
人类的听力在杂的环境中有效处理声音. 这项研究表明,听觉系统构建了内部"噪音模式",以分离声音,而不仅仅是抑制噪音.
科学领域:
- 听觉神经科学 听觉神经科学
- 精神声学是一种精神声学.
- 认知科学 认知科学
背景情况:
- 人类听力对背景噪声表现出了显著的稳定性,这种现象目前的模型无法完全解释.
- 现有的理论表明,适应稳定的声音组件,可能抑制噪音,但这与噪音的信息价值相冲突.
研究的目的:
- 调查噪声结构的内部模型,而不是简单的适应,调解听觉噪声的强度.
- 探索听觉系统如何将相关声音与背景噪声分离.
主要方法:
- 参与者执行听觉任务 (检测,识别,定位),前景声音嵌入到现实世界的背景噪音中.
- 操纵噪声特征,包括前景声音的时间,噪声中断和反复的噪声模式.
主要成果:
- 对于以后在噪音摘录中呈现的声音,听觉表现有所改善,在曝光的第一秒内获得了优势.
- 性能在噪音中断下保持稳健,并通过间歇性反复的背景来增强.
- 在反复出现的噪音中,对后来的声音的益处减少,这表明内部噪声表现保持不变.
结论:
- 听觉噪声的稳定性得到了快速估计,存储和更新的内部噪声结构模型的支持,称为"噪声方案".
- 这些"噪声方案"通过预测和建模背景噪声来促进并发声音的分离.
- 这些发现挑战了纯粹基于适应的模型,并突出了预测性内部表示在听觉感知中的作用.
相关概念视频
Schemas
11.5K
A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.
11.5K
Hearing
51.8K
When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
51.8K
The Cochlea
44.5K
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
44.5K
Perception of Sound Waves
4.4K
The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
4.4K
Sound Intensity Level
4.1K
Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
4.1K
Schemata
61
A schema is a mental construct that organizes related concepts, allowing the brain to process information efficiently. Upon activation, schemata facilitate assumptions about people or objects.
Two types of schemata are:
Two types of schemata are:
61


