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Specificity of experience-dependent pitch representation in the brainstem
Yisheng Xu1, Ananthanarayan Krishnan, Jackson T Gandour
1Center for Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA.
Neuroreport
|September 27, 2006
Summary
Brainstem pitch processing is shaped by language experience. While complex Mandarin tones show language-specific brainstem responses, simple linear pitch changes elicit similar responses across Chinese and English speakers.
Area of Science:
- Neuroscience
- Psychoacoustics
- Linguistics
Background:
- Brainstem-evoked potentials reveal experience-dependent plasticity in pitch representation.
- Mandarin tones feature curvilinear frequency modulation (f0) contours.
Purpose of the Study:
- To assess the tolerance limits of experience-dependent pitch selectivity.
- To evaluate cross-linguistic pitch representation of linear f0 ramps in Mandarin tones 2 and 4.
Main Methods:
- Cross-language comparison of brainstem potentials in Chinese and English speakers.
- Analysis of pitch strength and tracking accuracy for linear rising and falling f0 ramps.
Main Results:
- No cross-language differences in pitch strength or accuracy were found for linear f0 ramps.
- Linear ramps elicit homogeneous brainstem pitch representations irrespective of language background.
Conclusions:
- Brainstem pitch extraction is critically dependent on specific f0 contour dimensions encountered in native speech.
- Experience-dependent plasticity in pitch representation may be contour-specific.
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The Cochlea
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.
Hearing
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.
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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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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...
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