A New Approach to Sound Source Identification
Principal Investigator: Robert Lutfi
Abstract: We rely critically on our ability to identify simple objects and events from sound to function normally in everyday listening. Yet, despite its importance, little is known regarding this ability. A new psychophysical method promises to change this situation. Perturbation analysis has enjoyed recent success in vision as a means of revealing decision processes underlying object identification. Here it is applied to the auditory identification of elementary sound sources and their attributes. The application proceeds in three stages: First, the sounds of simple resonant sources are synthesized according to their equations of motion from theoretical acoustics. Second, listener decision strategy is determined from regression weights relating listener judgments to lawful perturbations in acoustic parameters as dictated by the equations for motion. Third, limits in processing are identified by comparing the obtained weights and residuals to those of a maximum-likelihood observer that bases decisions on acoustic information unique to the source attribute(s) being judged. The approach represents a significant advance over past methods that infer decision strategy from performance accuracy or from the effect of placing acoustic cues in unlawful opposition. Specific aims are: (1) to determine precisely how listeners use multiple sources of acoustic information to identify rudimentary sound sources and their attributes, (2) to isolate the factors that limit identification using training feedback and instruction, and (3) to test a general theoretical framework for predicting results in which less accurate though perceptually more robust acoustic cues offer a viable basis for identification. By advancing our understanding of the normal processes underlying sound source identification the results may prove key in the development of technologies and rehabilitative strategies that deal more effectively with the impact of dysfunctional hearing on everyday listening.
Funding Period: 2005-03-01 - 2010-02-28
more information: NIH RePORT
- A new approach to sound source segregationRobert A Lutfi
Department of Communicative Disorders, University of Wisconsin, Madison, WI 53706, USA
Adv Exp Med Biol 787:203-11. 2013..However, the results also show individual differences in segregation strategy that are not evident in the measures of performance accuracy alone...
- A method for evaluating the relation between sound source segregation and maskingRobert A Lutfi
Auditory Behavioral Research Laboratory, University of Wisconsin, Madison, Wisconsin 53706, USA
J Acoust Soc Am 129:EL34-8. 2011..Here a method is offered to identify the relation between masking and sound source segregation in studies and an example is given of its application...
- Target enhancement and noise cancellation in the identification of a rudimentary sound source in noiseRobert A Lutfi
Auditory Behavioral Research Lab, University of Wisconsin, Madison, Wisconsin 53706, USA
J Acoust Soc Am 129:EL52-6. 2011..The results underscore the difficulty with evaluating models of masking solely in terms of measures of performance accuracy...
- Auditory discrimination of force of impactRobert A Lutfi
Auditory Behavioral Research Laboraory and Department of Communicative Disorders, University of Wisconsin, Madison, Wisconsin 53706, USA
J Acoust Soc Am 129:2104-11. 2011..Providing correct feedback after each trial had little effect on the decision weights. The variability in these measures was comparable to that seen in studies involving the auditory discrimination of other source attributes...
- Molecular analysis of the effect of relative tone level on multitone pattern discriminationRobert A Lutfi
Department of Communicative Disorders and Waisman Center University of Wisconsin, Madison, Wisconsin 53706, USA
J Acoust Soc Am 120:3853-60. 2006..The results are discussed in terms of the effects of both sensory and perceptual factors on estimates of decision weights...
- Individual differences in source identification from synthesized impact soundsRobert A Lutfi
Department of Communicative Disorders and Waisman Center, University of Wisconsin, Madison, Wisconsin 53706, USA
J Acoust Soc Am 122:1017-28. 2007..The results are generally comparable to those obtained for the discrimination of arbitrary tone patterns...
- Level dominance in sound source identificationRobert A Lutfi
Department of Communicative Disorders, Auditory Behavioral Research Lab, University of Wisconsin, Madison, Wisconsin 53706, USA
J Acoust Soc Am 124:3784-92. 2008..The results are taken to underscore the importance of relative level in the identification of rudimentary sound sources...
- An efficient code for environmental sound classificationRaman Arora
Department of Electrical and Computer Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA
J Acoust Soc Am 126:7-10. 2009..The advantage of the random basis over traditional Fourier or wavelet representations is that it allows accurate classification at low target-to-interference ratios based on few samples and little or no prior information about signals...
- Sensory constraints on auditory identification of the material and geometric properties of struck barsRobert A Lutfi
Department of Communicative Disorders, Auditory Behavioral Research Laboratory, University of Wisconsin, Madison, Wisconsin 53706, USA
J Acoust Soc Am 127:350-60. 2010..The formula identifies conditions representing an expected bound on identification performance and thereby may be used to aid in the design of future studies for which the struck bar is the sound source of choice...