在语音处理中对声学和音调歧视的侧面化
R J Zatorre1, A C Evans, E Meyer
1McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University, Quebec, Canada.
概括
这项研究使用正电子发射断层扫描来绘制听觉处理期间的大脑活动的地图. 不同的语音声音激活了不同的大脑区域,突出了专门用于语言和音调感知的神经系统.
科学领域:
- 神经科学是一个神经科学.
- 认知神经科学 认知神经科学
- 听觉神经科学 听觉神经科学
背景情况:
- 了解听觉感知的神经基础对于认知神经科学至关重要.
- 之前的研究已经确定了参与处理听觉信息的各种大脑区域,但二级听觉皮层和侧面系统的具体作用需要进一步阐明.
研究的目的:
- 调查大脑激活模式,以响应不同的听觉刺激,包括噪音爆发和语音音节.
- 探索底层的神经机制的感知语音结构和音调的变化.
- 识别涉及听觉判断的侧向神经系统.
主要方法:
- 用正子发射断层扫描 (PET) 测量了10名健康志愿者的大脑活化.
- 参与者接触到听觉刺激,如噪音爆发和语音音节.
- 基于任务的功能神经成像用于评估特定听觉歧视任务期间的大脑反应.
主要成果:
- 初级听觉皮层在响应噪音爆发时表现出增加的活动.
- 声学上匹配的语音音节激活了双边的二级听觉皮层.
- 不同的语音结构导致布罗卡区域 (左半球) 的活动增加.
- 处理音调的变化激活了右前额叶皮质.
结论:
- 听觉处理涉及不同类型的声音的独特神经通路,主要和次要皮层起着专门的作用.
- 语音感知涉及左半球区域,比如布罗卡的区域,这表明口音重编码.
- 音调感知依赖于右半球机制,特别是涉及前额叶皮质.
相关概念视频
Stereotypes, Prejudice, and Discrimination
Humans are very diverse and although we share many similarities, we also have many differences. The social groups we belong to help form our identities (Tajfel, 1974). These differences may be difficult for some people to reconcile, which may lead to prejudice toward people who are different. Prejudice is a negative attitude and feeling toward an individual based solely on one’s membership in a particular social group (Allport, 1954; Brown, 2010). Prejudice is common against people who are...
Perception of Sound Waves
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 frequency...
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same frequency...
Downsampling
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
Auditory Perception
The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...
Perceiving Loudness, Pitch, and Location
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Non-Verbal Cues
Non-verbal communication extends beyond gestures and facial expressions to include vocal elements known as paralanguage. Paralanguage consists of non-verbal vocal cues such as pitch, loudness, speech rate, pauses, and non-verbal vocalizations like laughter, sighs, and moans. These elements not only accompany speech but also provide critical emotional and contextual information.The Role of Paralanguage in CommunicationParalanguage adds depth to spoken language by conveying emotions and...


