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Related Concept Videos

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...
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...
Beats01:09

Beats

The study of music provides many examples of the superposition of waves and the constructive and destructive interference that occurs. Very few examples of music being performed consist of a single source playing a single frequency for an extended period of time. A single frequency of sound for an extended period might be monotonous to the point of irritation, similar to the unwanted drone of an aircraft engine or a loud fan. Music is pleasant and exciting due to mixing the changing frequencies...
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.
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...
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...

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Related Experiment Video

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A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds
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Published on: November 26, 2012

Listeners discern affective variation in computer-generated musical sounds.

Freya Bailes1, Roger T Dean

  • 1MARCS Auditory Laboratories, University of Western Sydney, Penrith South DC, NSW 1797, Australia. f.bailes@uws.edu.au

Perception
|November 17, 2009
PubMed
Summary

This study explored how listeners perceive emotional changes (arousal and valence) in unfamiliar computer music. Structural changes in music significantly impacted affect perception, with segment length and transition type playing key roles.

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Area of Science:

  • Music cognition
  • Psychoacoustics
  • Computational musicology

Background:

  • Understanding the relationship between musical structure and emotional perception is crucial in music cognition.
  • Computer music offers a controlled environment to study perception of novel auditory structures and their affective impact.
  • Existing research often focuses on familiar music, leaving the perception of affect in unfamiliar musical styles underexplored.

Purpose of the Study:

  • To investigate the link between real-time perception of structural changes in computer music and the perception of its affect (arousal and valence).
  • To examine how different types of structural changes, such as segmentation and sound transitions, influence affective responses.
  • To compare affective perception in musically trained and untrained individuals when exposed to unfamiliar musical stimuli.

Main Methods:

  • Two experiments were conducted using computer-generated music with controlled stylistic features.
  • Experiment 1 involved 13 participants assessing segmentation and affect changes in response to musical segments.
  • Experiment 2 involved 16 musicians assessing affect and detecting intra-segment sound transitions, differentiating between continuous and instantaneous changes.

Main Results:

  • Affective changes (arousal and valence) were detected upon segmentation, though not all distinct segments elicited distinct affect.
  • The sequence of segment lengths influenced affective shifts: short-then-long segments produced greater arousal and valence changes than long-then-short.
  • Participants responded faster to instantaneous sound transitions than continuous ones within segments.
  • Musicians in Experiment 2 showed greater variability in arousal ratings compared to valence ratings, despite strong correlations between arousal and stimulus composition.

Conclusions:

  • Structural changes in unfamiliar music directly influence the perception of affect, particularly arousal and valence.
  • The temporal structure of musical segments (e.g., short-to-long) and the nature of sound transitions (instantaneous vs. continuous) are critical factors in affective processing.
  • Findings suggest that familiarity with musical styles may modulate the perception of arousal and valence, warranting further investigation into the role of prior experience in affective responses to music.