Related Experiment Video
Updated: May 28, 2026
10:50
Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
Published on: February 19, 2014
Categorization of extremely brief auditory stimuli: domain-specific or domain-general processes?
Emmanuel Bigand1, Charles Delbé, Yannick Gérard
1Centre National de la Recherche Scientifique, UMR5022, Laboratoire d'Etude de l'Apprentissage et du Développement, Université de Bourgogne, Dijon, France. emmanuel.bigand@u-bourgogne.fr
Plos One
|November 3, 2011
Summary
Auditory categorization of sounds like voices, music, and environmental noise is possible with very brief stimuli. Spectral envelope variability, not just energy, influences how accurately these sounds are identified.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal processing
Background:
- Understanding the minimal auditory stimulation required for sound categorization is crucial.
- Previous studies suggest a 'voice superiority effect' in auditory perception.
Purpose of the Study:
- To determine the minimum duration of auditory stimuli for differentiating voices, music, and environmental sounds.
- To investigate the role of normalization techniques and spectral envelope variability in auditory categorization.
Main Methods:
- Stimuli (voices, music, environmental sounds) were presented in segments of varying durations (e.g., 20 ms, 50 ms).
- Peak-level normalization and root-mean-square (RMS) energy equalization were applied to stimuli.
- Psychoacoustical analyses focused on spectral envelope variability.
Main Results:
- All sound types were categorized above chance with 50 ms segments.
- With peak-level normalization, categorization accuracy improved for 20 ms segments of music and voices.
- RMS energy equalization showed voices were better recognized than music and environmental sounds.
- Categorization of brief stimuli correlated with spectral envelope variability.
Conclusions:
- Auditory categorization is achievable with extremely brief sound segments.
- Findings challenge the traditional interpretation of the voice superiority effect.
- A more parsimonious explanation based on emergent properties of auditory categorization is proposed.
Related Concept Videos
01:21Perceiving 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...
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...
01:15Auditory Pathway
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
01:31Hearing
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.
01:19Encoding
Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...
01:17Auditory 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...
01:13The 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.