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Related Concept Videos

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...
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...
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...

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Related Experiment Video

Updated: Jul 4, 2026

A Two-interval Forced-choice Task for Multisensory Comparisons
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Published on: November 9, 2018

Monaural level discrimination under dichotic conditions.

Daniel E Shub1, Nathaniel I Durlach, H Steven Colburn

  • 1Speech and Hearing Bioscience and Technology Program, Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. dshub@sas.upenn.edu

The Journal of the Acoustical Society of America
|June 10, 2008
PubMed
Summary

Auditory perception is complex; even with simple tones, judging sound at one ear is difficult when another sound is present in the other. This challenges current binaural hearing models.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Binaural Hearing

Background:

  • Binaural hearing allows sound localization and segregation.
  • Existing models assume independent processing of stimuli presented to each ear.

Purpose of the Study:

  • To investigate the impact of contralateral distractors on auditory threshold discrimination.
  • To test the predictive power of current binaural models.

Main Methods:

  • Subjects discriminated the level of a 600 Hz target tone presented to the left ear.
  • An identical-frequency distractor was presented to the right ear with varying phase and level conditions.
  • Auditory thresholds were measured under different distractor conditions.

Main Results:

  • A fixed contralateral distractor increased the auditory threshold from 0.7 dB to 1.1 dB.
  • Variability in distractor phase or level further elevated thresholds to 1.6 dB and 5.8 dB, respectively.
  • Combined distractor variability yielded the highest threshold of 7.3 dB.

Conclusions:

  • Increased thresholds indicate significant interference from contralateral distractors.
  • Current binaural models fail to predict these observed threshold elevations.
  • A new model incorporating binaural fusion dimensions (loudness, spatial position) may better explain the results.