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Related Concept Videos

Echo01:06

Echo

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...
Sound Intensity Level00:53

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence 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...
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.
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Perception of Sound Waves01:01

Perception of Sound Waves

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 frequency...

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Related Experiment Video

Updated: May 11, 2026

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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Published on: January 23, 2017

Human interaural time difference thresholds for sine tones: the high-frequency limit.

Andrew Brughera1, Larisa Dunai, William M Hartmann

  • 1Department of Biomedical Engineering, Center for Hearing Research, Boston University, Boston, Massachusetts 02115, USA.

The Journal of the Acoustical Society of America
|May 10, 2013
PubMed
Summary

Human listeners

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Interaural time difference (ITD) is crucial for sound localization.
  • Understanding ITD perception across frequencies is key to auditory processing.

Purpose of the Study:

  • To measure human ITD thresholds across various frequencies.
  • To model ITD detection using computational neuroscience approaches.

Main Methods:

  • Psychoacoustic experiments measuring smallest detectable ITD for sine tones.
  • Biophysically based computational modeling of medial superior olive (MSO) neurons.
  • Development and testing of binaural display models (place-based, rate-difference, hybrid).

Main Results:

  • ITD thresholds inversely proportional to frequency at low frequencies (250-700 Hz).
  • Smallest ITD thresholds observed at mid-frequencies (700-1000 Hz).
  • Rapid, super-exponential increase in ITD thresholds above 1000 Hz.
  • MSO model showed robust ITD responses up to 1000 Hz.
  • Place-based and hybrid models best reproduced human ITD threshold data.

Conclusions:

  • Human ITD perception is frequency-dependent, with unique patterns at low, mid, and high frequencies.
  • Computational models, particularly hybrid approaches, can effectively simulate human ITD detection.
  • Findings advance understanding of binaural processing and sound localization mechanisms.