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Related Concept Videos

Hearing01:31

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.
Auditory Pathway01:15

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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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Perceiving Loudness, Pitch, and Location01:21

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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...
Auditory Perception01:17

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...

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Infant Auditory Processing and Event-related Brain Oscillations
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Stimulus rate and subcortical auditory processing of speech.

Jennifer L Krizman1, Erika Skoe, Nina Kraus

  • 1Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Ill. 60208-3540, USA. j-krizman@northwestern.edu

Audiology & Neuro-Otology
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Stimulation rate impacts auditory brainstem responses (ABR) differently for click versus speech sounds. Speech-evoked responses show rate-dependent timing changes, while frequency-following responses (FFR) are affected in high frequencies.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • The auditory brainstem precisely processes temporal information in dynamic acoustic environments.
  • Understanding how stimulation rate affects auditory brainstem responses (ABR) is crucial for assessing subcortical auditory processing.
  • Speech perception relies heavily on the accurate encoding of temporal cues by the auditory system.

Purpose of the Study:

  • To investigate the effects of varying stimulation rates on auditory brainstem responses (ABR) to both click and speech stimuli (/da/).
  • To determine if stimulus rate differentially affects click-evoked versus speech-evoked onset responses.
  • To examine the rate dependency of subcomponents of the speech-evoked ABR, specifically the frequency-following response (FFR).

Main Methods:

  • Auditory brainstem responses (ABR) were recorded to click and consonant-vowel (/da/) stimuli.
  • Stimuli were presented at three distinct rates: 15.4 Hz, 10.9 Hz, and 6.9 Hz.
  • Analysis focused on the latency of onset responses and the magnitude of frequency-following responses (FFR) across different frequencies.

Main Results:

  • Click-evoked responses remained consistent across all tested rates.
  • Speech-evoked onset response latency increased systematically with increasing presentation rate.
  • The magnitude of high-frequency (>400 Hz) components of the frequency-following response (FFR) decreased with higher stimulation rates, while the fundamental frequency component was unaffected.

Conclusions:

  • Stimulation rate differentially impacts auditory brainstem responses, affecting speech-evoked onset responses and high-frequency FFR components.
  • Distinct neural mechanisms likely underlie the processing of low- and high-frequency components within the FFR.
  • The differential rate sensitivity suggests separate neural pathways for the speech-evoked onset response and FFR subcomponents, with potential clinical implications for populations with auditory processing deficits.