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Auditory cortical responses in the cat to sounds that produce spatial illusions

Abstract

Humans and cats can localize a sound source accurately if its spectrum is fairly broad and flat1,2,3, as is typical of most natural sounds. However, if sounds are filtered to reduce the width of the spectrum, they result in illusions of sources that are very different from the actual locations, particularly in the up/down and front/back dimensions4,5,6. Such illusions reveal that the auditory system relies on specific characteristics of sound spectra to obtain cues for localization7. In the auditory cortex of cats, temporal firing patterns of neurons can signal the locations of broad-band sounds8,9. Here we show that such spike patterns systematically mislocalize sounds that have been passed through a narrow-band filter. Both correct and incorrect locations signalled by neurons can be predicted quantitatively by a model of spectral processing that also predicts correct and incorrect localization judgements by human listeners6. Similar cortical mechanisms, if present in humans, could underlie human auditory spatial perception.

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Figure 1: Artificial-neural-network analysis of spike patterns from a single unit (9806C16).
Figure 2: Spectral differences and network classification of cortical responses to narrow-band sounds.
Figure 3: Summary of correspondence between physiological responses and the acoustical model.

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References

  1. Makous, J. C. & Middlebrooks, J. C. Two-dimensional sound localization by human listeners. J. Acoust. Soc. Am. 87, 2188–2200 (1990).

    Article  ADS  CAS  Google Scholar 

  2. Huang, A. Y. & May, B. J. Sound orientation behavior in cats. II. Mid-frequency spectral cues for sound localization. J. Acoust. Soc. Am. 100, 1070–1080 (1996).

    Article  ADS  CAS  Google Scholar 

  3. Populin, L. C. & Yin, T. C. Behavioral studies of sound localization in cat. J. Neurosci. 18, 2147–2160 (1998).

    Article  CAS  Google Scholar 

  4. Blauert, J. Sound localization in the median plane. Acustica 22, 205–213 (1969–1970).

  5. Hebrank, J. & Wright, D. Spectral cues used in the localization of sound sources on the median plane. J. Acoust. Soc. Am. 56, 1829–1834 (1974).

    Article  ADS  CAS  Google Scholar 

  6. Middlebrooks, J. C. Narrow-band sound localization related to external ear acoustics. J. Acoust. Soc. Am. 92, 2607–2624 (1992).

    Article  ADS  CAS  Google Scholar 

  7. Middlebrooks, J. C. & Green, D. M. Sound localization by human listeners. Annu. Rev. Psychol. 42, 135–159 (1991).

    Article  CAS  Google Scholar 

  8. Middlebrooks, J. C., Xu, L., Eddins, A. C. & Green, D. M. Codes for sound-source location in non-tonotopic auditory cortex. J. Neurophysiol. 80, 863–881 (1998).

    Article  CAS  Google Scholar 

  9. Xu, L., Furukawa, S. & Middlebrooks, J. C. Sensitivity to sound-source elevation in non-tonotopic auditory cortex. J. Neurophysiol. 80, 882–894 (1998).

    Article  CAS  Google Scholar 

  10. Najafi, K., Wise, K. D. & Mochizuki, T. Ahigh-yield IC-compatible multichannel recording array. IEEE Trans. Electron Devices 32, 1206–1211 (1985).

    Article  ADS  Google Scholar 

  11. Middlebrooks, J. C. & Green, D. M. Directional dependence of interaural envelope delays. J. Acoust. Soc. Am. 87, 2149–2162 (1990).

    Article  ADS  CAS  Google Scholar 

  12. Middlebrooks, J. C. Individual differences in external-ear transfer functions reduced by scaling in frequency. J. Acoust. Soc. Am.(in press).

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Acknowledgements

We thank Z. Onsan for expert technical assistance, and E. Macpherson, B. Mickey, D.Moody, B. Pfingst and J. Schacht for comments on the manuscript. This work was supported by the NIH/HIHCD. The multi-channel recording probes were supplied by the Center for Neural Communication Technology, which is supported by the NIH/NCRR.

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Correspondence to John C. Middlebrooks.

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Xu, L., Furukawa, S. & Middlebrooks, J. Auditory cortical responses in the cat to sounds that produce spatial illusions. Nature 399, 688–691 (1999). https://doi.org/10.1038/21424

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