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Linear correlates in the speech signal: the orderly output constraint
H M Sussman1, D Fruchter, J Hilbert
1Department of Linguistics and Communication Sciences and Disorders, University of Texas at Austn 78712, USA. sussman@mail.utexas.edu
The Behavioral and Brain Sciences
|March 31, 1999
Summary
Animal auditory systems provide models for human speech processing. Species-specific sound categorization reveals linear relationships crucial for understanding consonant-vowel sounds and solving the acoustic-phonetic noninvariance problem.
Area of Science:
- Neuroethology
- Auditory Neuroscience
- Speech Perception
Background:
- Mammalian and avian auditory systems exhibit species-specific specializations for processing complex acoustic signals.
- These specializations involve forming biologically relevant categories from information-bearing acoustic parameters.
- Such processing strategies may offer insights into human speech sound categorization and representation.
Purpose of the Study:
- To develop a conceptualization of human processing of consonant-vowel (CV) sequences by analogy with neural models from non-human species.
- To offer a partial solution to the noninvariance dilemma in speech perception, addressing the variable acoustic waveform of phonetic segments.
- To explore the role of acoustic parameter correlations in speech sound categorization.
Main Methods:
- Utilizing neural models from the mustached bat and barn owl auditory systems.
- Analyzing the empirical phenomenon of locus equations to describe relationships between acoustic parameters.
- Investigating the correlation between the second formant (F2) of vowels and the F2 at the onset of CV transitions.
Main Results:
- Species-specific categories in bats and owls are based on highly correlated and linear acoustic parameters due to physical laws.
- Locus equations reveal consistent and robust linear correlations between F2 vowel and F2 onset across speakers, languages, and under perturbation.
- This "orderly output constraint" demonstrates high correlation and linearity in speech cues for place of articulation.
Conclusions:
- The "orderly output constraint" in speech perception may stem from an evolutionarily conserved auditory processing strategy.
- High correlation and linearity in acoustic parameters cueing place of articulation might have evolved due to preadaptation in mammalian auditory systems.
- This suggests a biological basis for representing tightly correlated, linearly related acoustic signal components in human speech processing.
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