Chimaeric sounds reveal dichotomies in auditory perception
Top Cited Papers
- 7 March 2002
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature
- Vol. 416 (6876), 87-90
- https://doi.org/10.1038/416087a
Abstract
By Fourier's theorem1, signals can be decomposed into a sum of sinusoids of different frequencies. This is especially relevant for hearing, because the inner ear performs a form of mechanical Fourier transform by mapping frequencies along the length of the cochlear partition. An alternative signal decomposition, originated by Hilbert2, is to factor a signal into the product of a slowly varying envelope and a rapidly varying fine time structure. Neurons in the auditory brainstem3,4,5,6 sensitive to these features have been found in mammalian physiological studies. To investigate the relative perceptual importance of envelope and fine structure, we synthesized stimuli that we call ‘auditory chimaeras’, which have the envelope of one sound and the fine structure of another. Here we show that the envelope is most important for speech reception, and the fine structure is most important for pitch perception and sound localization. When the two features are in conflict, the sound of speech is heard at a location determined by the fine structure, but the words are identified according to the envelope. This finding reveals a possible acoustic basis for the hypothesized ‘what’ and ‘where’ pathways in the auditory cortex7,8,9,10.Keywords
This publication has 21 references indexed in Scilit:
- Distinct Pathways Involved in Sound Recognition and Localization: A Human fMRI StudyNeuroImage, 2001
- Functional Specialization in Rhesus Monkey Auditory CortexScience, 2001
- Speech Recognition with Primarily Temporal CuesScience, 1995
- The dominant role of low-frequency interaural time differences in sound localizationThe Journal of the Acoustical Society of America, 1992
- Stream Segregation and Peripheral ChannelingMusic Perception, 1991
- Better speech recognition with cochlear implantsNature, 1991
- A cochlear frequency-position function for several species—29 years laterThe Journal of the Acoustical Society of America, 1990
- Lateralization of low-frequency, complex waveforms: The use of envelope-based temporal disparitiesThe Journal of the Acoustical Society of America, 1985
- Physiological response properties of cells labeled intracellularly with horseradish peroxidase in cat ventral cochlear nucleusJournal of Comparative Neurology, 1983
- The effect of carrier and modulation frequency on lateralization based on interaural phase and interaural group delayHearing Research, 1981