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Related Concept Videos

Aliasing01:18

Aliasing

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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
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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 Cochlea

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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.
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Auditory Perception01:17

Auditory Perception

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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...
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Hearing

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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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Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
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Asymmetric sampling in human auditory cortex reveals spectral processing hierarchy.

Jérémy Giroud1, Agnès Trébuchon1,2, Daniele Schön1

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience

Background:

  • Speech perception involves both left and right auditory cortices.
  • Functional asymmetries in speech processing are not fully understood.
  • Existing models of auditory processing are widely debated.

Purpose of the Study:

  • To characterize the functional asymmetry in auditory cortical processing.
  • To investigate the neural dynamics underlying speech perception.
  • To provide a detailed description of hemispheric differences in auditory cortex.

Main Methods:

  • Analysis of intracranial electrophysiological data from 96 epilepsy patients.
  • Recording cortical responses from implanted electrodes in auditory cortex (AC).
  • Presentation of acoustic transients and speech syllables to assess neural dynamics.

Main Results:

  • Similar bimodal spectral responses (theta and beta-gamma bands) in left and right primary/secondary AC.
  • Emergence of hemispheric asymmetry beyond primary AC: delta/beta in right, theta/gamma in left.
  • Heterogeneous responses in auditory association cortex (AAC) with bilateral alpha/gamma activity during syllable presentation.

Conclusions:

  • Intracranial data offer a nuanced view of auditory processing in both hemispheres.
  • Hemispheric specialization in auditory cortex becomes apparent at higher processing levels.
  • Neural dynamics in specific frequency bands may shape auditory and speech processing.