Springer, 2005. — 340 p. — (Springer Handbook of Auditory Research. Volume 25).Sound source localization is arguably one of the most important functions of the auditory system in any hearing animal. During the course of their evolution, both invertebrates and vertebrates have developed a number of different strategies to enable them to determine the position of a sound source around them. In almost all cases, this strategy has required two ears that detect sound and a central processing system that extracts direction from the tiniest differences in the signals detected at the two ears. In the many volumes in the Springer Handbook of Auditory Research series, various authors have dealt with sound localization, but the information has always been in one chapter or part of a chapter in any given volume. Because there is such a large body of knowledge about localization, it became apparent that the topic was worth considering in a single volume that explores localization not only comparatively but also from the perspective of models and understanding general computational mechanisms involved in localization. Moreover, the current volume updates a number of chapters from earlier volumes (e.g., Colburn in Vol. 6—Auditory Computation and Brown in Vol. 5—Comparative Hearing: Mammals). In Chapter 1, Fay and Popper provide a detailed overview of the book. The diversity of hearing and localization mechanisms in insects is considered in detail by Robert in Chapter 2, in which he demonstrates that localization is likely to have arisen at multiple independent times in different insects. Because sound in water is almost five times faster than in air, the binaural cues used by terrestrial vertebrates and invertebrates are not generally available to fishes. At the same time, fishes have available to them a set of cues (particle motion) not readily available in air. In Chapter 3, Fay discusses current ideas about fish sound localization, and this serves as an excellent comparative perspective toward not only insects, but also terrestrial vertebrates. Localization by nonmammalian terrestrial vertebrates and the broad range of mechanisms used by these animals are discussed in Chapter 4 by Christensen-Dalsgaard. Of course, the best known localization mechanisms are found in mammals, and these are treated in several chapters. In Chapter 5, Brown and May provide a comparative approach to knowledge of mammalian hearing. In this chapter, the authors consider the extensive psychophysical data on sound localization and all aspects of directional hearing. Although there is no doubt considerable diversity in peripheral localization mechanisms among terrestrial vertebrates, and especially in amniotes, there is much more stability between species in central nervous system processing of such signals. Such mechanisms and their development are described in detail in Chapter 6 by Kubke and Carr. The last two chapters continue with discussions of mammalian localization but emphasize computational mechanisms. Although these chapters are primarily aimed at mammalian systems (and especially humans), it is possible that a better understanding of computation associated with localization in mammals may ultimately be extrapolated to other vertebrates as well. In Chapter 7, Trahiotis, Bernstein, Stern, and Buell extend their consideration to computational models of binaural processing and interaural correlation. This is extended even further in Chapter 8 by Colburn and Kulkarni, who treat computational models for many aspects of binaural hearing and sound localization.Introduction to Sound Source Localization Directional Hearing in Insects Sound Source Localization by Fishes Directional Hearing in Nonmammalian Tetrapods Comparative Mammalian Sound Localization Development of the Auditory Centers Responsible for Sound Localization Interaural Correlation as the Basis of a Working Model of Binaural Processing: An Introduction Models of Sound Localization
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