Abstract
The owl captures prey using sound localization. In the classical model, the owl infers sound direction from the position of greatest activity in a brain map of auditory space. However, this model fails to describe the actual behavior. Although owls accurately localize sources near the center of gaze, they systematically underestimate peripheral source directions. We found that this behavior is predicted by statistical inference, formulated as a Bayesian model that emphasizes central directions. We propose that there is a bias in the neural coding of auditory space, which, at the expense of inducing errors in the periphery, achieves high behavioral accuracy at the ethologically relevant range. We found that the owl's map of auditory space decoded by a population vector is consistent with the behavioral model. Thus, a probabilistic model describes both how the map of auditory space supports behavior and why this representation is optimal.
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Acknowledgements
We thank L. Hausmann and H. Wagner for providing the behavioral data and C. Keller and T. Takahashi for providing the head-related transfer functions. We thank S. Edut, D. Eilam, E. Knudsen, M. Konishi and K. Saberi, whose work substantially contributed to testing our hypothesis. We thank S. Deneve, M. Konishi, A. Margolis, A. Oster, O. Schwartz and A. Wohrer for advice and comments on the manuscript. This study was supported by US National Institutes of Health grant DC007690 (J.L.P.) and the Marie Curie Team of Excellence grant BIND MECT-CT-20095-02481 (B.J.F.).
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B.J.F. designed the model and performed the model simulations. J.L.P. supervised the project. B.J.F. and J.L.P. wrote the paper.
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Fischer, B., Peña, J. Owl's behavior and neural representation predicted by Bayesian inference. Nat Neurosci 14, 1061–1066 (2011). https://doi.org/10.1038/nn.2872
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DOI: https://doi.org/10.1038/nn.2872
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