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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

Auditory Pathway

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.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
The Cochlea01:13

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.
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...
Perceiving Loudness, Pitch, and Location01:21

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...

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Related Experiment Video

Updated: Jun 27, 2026

Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients
07:43

Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients

Published on: June 17, 2019

Human Single-Neuron Responses to Multi-Feature Auditory Deviants: Evidence From Medial Temporal Lobe.

Vinícius R Carvalho1, Alejandro Hugo Nasimbera2, Silvia Kochen2

  • 1Department of Psychology, RITMO Centre for Interdisciplinary Studies in Rhythm, Time and Motion, University of Oslo, Oslo, Norway.

The European Journal of Neuroscience
|June 25, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals how the human amygdala processes unexpected sounds, showing early suppression and later enhancement, particularly for timing changes. Hippocampal responses were minimal, suggesting limited roles in passive auditory deviance detection.

Keywords:
MMNamygdalahippocampuspredictive processingsingle neuron

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Last Updated: Jun 27, 2026

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07:43

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Published on: June 17, 2019

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Published on: October 22, 2015

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Human Electrophysiology

Background:

  • Auditory deviance detection is crucial for adaptive behavior.
  • Mismatch negativity is a known indicator, but human single-unit data is scarce.
  • Understanding cellular mechanisms of predictive auditory processing is vital.

Purpose of the Study:

  • To characterize single and multi-unit responses to multi-feature auditory deviants in humans.
  • To investigate neural responses in the amygdala, hippocampus, Heschl's gyrus, and insula.
  • To provide the first human single-unit characterization of multi-feature auditory deviance processing.

Main Methods:

  • Used the Optimum-1 multi-feature oddball paradigm during unattended listening.
  • Performed microwire recordings from 13 epilepsy patients.
  • Analyzed single and multi-unit responses to frequency, location, intensity, and timing deviants.

Main Results:

  • Amygdala showed multi-phase responses: timing deviants elicited early suppression (~60ms) and later enhancement (~200ms); intensity deviants caused suppression (~300ms).
  • Hippocampus exhibited sparse engagement, with only a weak late effect for sound frequency.
  • Heschl's gyrus and insula showed heterogeneous and feature-specific responses, including intensity and spatial processing.

Conclusions:

  • Human amygdala exhibits temporally dissociable deviance encoding mechanisms at the subcortical level.
  • Sparse hippocampal responses suggest limited involvement in passive auditory deviance detection.
  • These findings establish a baseline for understanding cellular mechanisms of predictive auditory processing in humans.