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Perceiving Loudness, Pitch, and Location

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.
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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...

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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 cochlea, a...

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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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Related Experiment Video

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A Two-interval Forced-choice Task for Multisensory Comparisons

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Published on: November 9, 2018

Auditory time-interval perception as causal inference on sound sources.

Ken-Ichi Sawai¹, Yoshiyuki Sato, Kazuyuki Aihara

¹Institute of Industrial Science, University of Tokyo Tokyo, Japan.

Frontiers in Psychology

|December 11, 2012

Summary

This study explains auditory time interval misperception using a Bayesian model. The model suggests our brains infer sound sources, impacting how we perceive short sound sequences.

Keywords:

Bayesian inference causal inference source identification time-interval perception

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Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses

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Area of Science:

Auditory perception
Cognitive neuroscience
Computational modeling

Background:

Perceiving temporal patterns on a sub-second timescale is crucial for communication.
The precise mechanisms underlying auditory time interval perception remain unclear.
Known misperceptions include under- or overestimation of auditory intervals based on preceding sounds.

Purpose of the Study:

To develop a comprehensive model explaining auditory time interval misperception.
To investigate the role of causal inference and sound source attribution in temporal perception.
To explore potential cross-modal mechanisms in temporal pattern recognition.

Main Methods:

Constructed a Bayesian observer model incorporating a probabilistic variable for sound causality.
Utilized prior knowledge assumptions of periodic, short time intervals from a single source.
Performed numerical simulations to test the model's ability to replicate perceptual errors.

Main Results:

The developed Bayesian model successfully reproduced known auditory time interval misperceptions.
The model's findings align with previous experiments showing frequency differences mitigate illusory perception.
The model's success supports the hypothesis of causal inference from sound sources.

Conclusions:

Auditory time interval misperception can be explained by a Bayesian model based on causal inference of sound sources.
The findings suggest a common underlying mechanism for temporal pattern perception across auditory, visual, and tactile modalities.
Differences in temporal resolution across sensory modalities may explain variations in observed phenomena.