The auditory system highlights spectral changes to help listeners compare sounds

Evidence

The ability to do this is most probably a result of neural processes within the hearing system. For example, a study by Summerfield et al. (1984) shows that exposure for just 1 second to a sound can result in spectral adaptation, possibly via neural adaptation in the auditory periphery. Summerfield et al. (1984) played a sequence of sounds to the listener the first of which consisted of a harmonic complex containing the first 50 harmonics of a tone, with a number of those 50 harmonics reduced in amplitude. The complex was then heard again but with the harmonics which had previously been reduced in level increased to the level of the remaining harmonics. When listening to the second sound, the components that had changed in level were heard to stand out perceptually from the rest of the tone. This enhancement effect appears to demonstrate the auditory system’s heightened sensitivity to temporal changes in spectrum and may show a mechanism which helps listeners to perceive differences in magnitude spectra between different sounds, as well as a system that can remove spectral distortion. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1252

Categorization

Category: Factual Claims

• XREF: The enhancement effect connects to work on auditory scene analysis and cocktail-party listening (e.g., Bregman’s auditory streaming).
• CANDY: Exposure for just one second to a sound lets the ear emphasize whatever changes in it next — a neat party-worthy fact about hearing.

Related

• One second of exposure triggers neural spectral adaptation in hearing (similarity 0.89)
• Two kinds of sound change activate different processing features in hearing (similarity 0.84)
• Auditory spectra smooth harmonic detail while preserving formant structure (similarity 0.83)
• Listeners can detect changes in the probability statistics of continuous acoustic textures (similarity 0.82)
• Hearing is highly sensitive to temporal changes in sound (similarity 0.82)
• Spectrally shaped targets can equalize audibility across listeners with differing audiograms. (similarity 0.82)
• Detecting statistical changes in sound improves with listening time and change size (similarity 0.82)
• Hearing adapts to focus on the audible 20-30 dB of decay (similarity 0.82)
• Auditory attention requires temporal variation in any sound signal (similarity 0.81)
• The hearing system analyzes complex sounds by linear superposition of component responses (similarity 0.81)
• The auditory system largely ignores signal phase, driving spectral analysis conventions (similarity 0.81)
• Attentive focus on a particular timbre changes which auditory stream the ear follows. (similarity 0.81)
• Humans hear spectral content, not waveform shape or phase shifts (similarity 0.81)
• The power spectrum is blind to the relative phase of a sound’s components (similarity 0.80)
• Auditory textures are recognized through their spectrotemporal statistics despite highly variable local structure (similarity 0.80)