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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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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.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Hearing01:31

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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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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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The Cochlea01:13

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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Perception of Sound Waves01:01

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

Perceiving Loudness, Pitch, and Location

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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...
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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
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Stable sound decoding despite modulated sound representation in the auditory cortex.

Akihiro Funamizu1, Fred Marbach1, Anthony M Zador1

  • 1Cold Spring Harbor Laboratory, 1 Bungtown Rd, Cold Spring Harbor, NY 11724, USA.

Current Biology : CB
|October 6, 2023
PubMed
Summary
This summary is machine-generated.

Auditory cortex neurons respond to sounds and expectations. While neural activity changes with reward and stimulus anticipation, the auditory cortex lacks sufficient information for optimal decision-making.

Keywords:
auditory cortexdecodingencodingperceptual decision-makingtwo-photon microscopy

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Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach
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Area of Science:

  • Neuroscience
  • Auditory Cortex Research
  • Decision Making

Background:

  • Neuronal activity in the auditory cortex is influenced by both external sounds and internal cognitive states.
  • Understanding how non-sensory context affects neural processing is crucial for comprehending complex behaviors.

Purpose of the Study:

  • To investigate the neural mechanisms underlying the influence of non-sensory context on auditory cortical activity.
  • To determine if the auditory cortex represents task-relevant contextual information for decision-making.

Main Methods:

  • Head-fixed mice were trained on a two-alternative-choice auditory task with manipulated reward or stimulus expectation.
  • Two-photon calcium imaging was used to record population activity of single neurons in the auditory cortex.
  • Linear decoders were employed to assess the information content of neural activity.

Main Results:

  • Both stimulus and reward expectation modulated neuronal activity in the auditory cortex.
  • Auditory cortical activity could be decoded to predict stimuli at levels comparable to or exceeding animal performance.
  • Despite modulation, neither task context nor animal choice could be reliably decoded from the recorded neural data.

Conclusions:

  • The auditory cortex exhibits modulation by task priors but does not encode sufficient information for optimal exploitation of these priors.
  • Complex decision-making involving dynamic sensory and contextual information may rely on neural representations outside the auditory cortex.