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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...
Sound Intensity00:58

Sound Intensity

The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the emitted...
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...
Intensity and Pressure of Sound Waves01:05

Intensity and Pressure of Sound Waves

The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
Unlike the time average of a sinusoidal term, which is zero since it is positive and...
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.
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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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
07:52

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High-intensity sound increases the size of visually perceived objects.

Yasuhiro Takeshima1, Jiro Gyoba

  • 1Department of Psychology, Graduate School of Arts & Letters, Tohoku University, Kawauchi 27-1, Sendai 980-8576, Japan. yasuhiro.takeshima@gmail.com

Attention, Perception & Psychophysics
|November 29, 2012
PubMed
Summary

Auditory stimuli, like sound intensity, can influence how we visually perceive object size. This effect is more pronounced in peripheral vision and depends on the reliability of auditory cues.

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Area of Science:

  • Psychology
  • Neuroscience
  • Sensory Perception

Background:

  • Previous research indicates sound can inform object length estimation.
  • A natural correspondence exists between object size and sound intensity.
  • Audiovisual interactions' impact on size perception remains largely unexplored.

Purpose of the Study:

  • To investigate how auditory stimuli affect visual size perception.
  • To examine the influence of sound intensity, audiovisual temporal windows, and retinal eccentricity.

Main Methods:

  • Systematic manipulation of auditory stimulus intensity.
  • Varying the temporal overlap between auditory and visual stimuli.
  • Assessing visual size perception at different retinal eccentricities.

Main Results:

  • High-intensity sounds enlarged the perceived size of visual objects.
  • This audiovisual size illusion was amplified in the peripheral visual field.
  • The effect was contingent on auditory cues being more reliable than visual cues.

Conclusions:

  • Auditory cues significantly modulate visual size perception.
  • Retinal eccentricity and sound intensity are key factors influencing cue reliability.
  • This study highlights the integrated nature of sensory information processing.