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Related Concept Videos

Perception of Sound Waves01:01

Perception of Sound Waves

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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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Sound Intensity Level00:53

Sound Intensity Level

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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...
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Sound Waves: Interference00:53

Sound Waves: Interference

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Interference: Path Lengths01:10

Interference: Path Lengths

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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...
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Larynx01:21

Larynx

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The human larynx, often referred to as the voice box, is an intricate organ located in the neck. It serves as a pathway for air to enter the lungs during respiration and is an essential component of voice production.
Anatomy of the Larynx
The larynx consists of various components, including cartilage, muscles, and vocal cords. Its structure includes three large unpaired cartilages—the thyroid, cricoid, and epiglottis—and three smaller paired cartilages—the arytenoids,...
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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.
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Nonlinear vocal phenomena and speech intelligibility.

Andrey Anikin1, David Reby2,3, Katarzyna Pisanski2,4

  • 1Division of Cognitive Science, Department of Philosophy, Lund University, Box 192, SE-221 00, Lund, Sweden.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|April 3, 2025
PubMed
Summary
This summary is machine-generated.

Human speech intelligibility relies on vocal stability, not necessarily tonal quality. Nonlinear vocal phenomena (NLP) can improve vowel perception but voicing interruptions reduce clarity, suggesting better control over NLP evolved for speech.

Keywords:
evolution of languageformant frequenciesnonlinear vocal phenomenaspeechvocal membranesvoice

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Area of Science:

  • Evolutionary biology
  • Speech science
  • Bioacoustics

Background:

  • Humans possess a simpler vocal apparatus than other great apes, lacking vocal membranes and air sacs.
  • This simplification is hypothesized to be an adaptation for speech, with fewer nonlinear vocal phenomena (NLP) creating a stable vocal source.
  • The assumption that NLP reduce speech intelligibility is supported by studies of dysphonia but lacks direct experimental testing.

Purpose of the Study:

  • To experimentally test the impact of nonlinear vocal phenomena (NLP) on speech intelligibility.
  • To determine whether vocal stability or tonal quality is more critical for speech perception.
  • To investigate how different types of NLP affect the intelligibility of vowels, words, and sentences.

Main Methods:

  • Manipulation of NLP in synthesized and recorded vocal stimuli, including vowels, words, and sentences.
  • Assessment of speech intelligibility through discrimination tasks.
  • Analysis of the effects of continuous NLP (subharmonics, amplitude modulation, chaos) and abrupt NLP (voicing interruptions, pitch jumps).

Main Results:

  • Vocal stability, rather than tonal quality, is essential for speech intelligibility.
  • Continuous NLP can enhance vowel perception in high-pitched voices by revealing formant transitions.
  • Rough-sounding voices with continuous NLP remain intelligible, but voicing interruptions and pitch jumps significantly decrease intelligibility.

Conclusions:

  • Nonlinear vocal phenomena (NLP) were not eliminated during human evolution for speech but rather brought under better control.
  • Vocal stability is a key factor for intelligibility, while certain NLP can be beneficial.
  • Understanding the control of NLP provides insights into the evolution of human speech.