(see Popper and Fay, 1997). (It should be noted that the
term `¢shes' includes modern bony ¢shes, elasmobranchs
(sharks and rays), as well as the jawless hag¢sh
and lampreys. However, due to limited data for groups
other than bony ¢shes, it is not clear where some of the
characteristics and hearing capabilities discussed herein
actually arose.) In some cases the similarity in function
is mediated by some of the basic auditory structures
(e.g., the sensory hair cell) that evolved very early in
vertebrate history. However, in other cases similar tasks
and functions have been accomplished in the auditory
system using diverse structures and mechanisms.
The theme we present here is that there may be a set
of very general and constant pressures that have shaped
the functions of auditory systems throughout vertebrate
evolution. The general factor may be a capacity for a
sort of auditory scene analysis (Bregman, 1990) that we
assume to have been important throughout the evolution
of vertebrate hearing. In this review we concentrate
on hearing mechanisms of ¢shes because these vertebrates
illustrate functions and functional relationships
in the auditory system that tend to be widely shared
among vertebrates. There are also instances where the
same basic structures are found throughout the vertebrates
and provide the basis for many of the shared
functions of the auditory system.
(see Popper and Fay, 1997). (It should be noted that theterm `¢shes' includes modern bony ¢shes, elasmobranchs(sharks and rays), as well as the jawless hag¢shand lampreys. However, due to limited data for groupsother than bony ¢shes, it is not clear where some of thecharacteristics and hearing capabilities discussed hereinactually arose.) In some cases the similarity in functionis mediated by some of the basic auditory structures(e.g., the sensory hair cell) that evolved very early invertebrate history. However, in other cases similar tasksand functions have been accomplished in the auditorysystem using diverse structures and mechanisms.The theme we present here is that there may be a setof very general and constant pressures that have shapedthe functions of auditory systems throughout vertebrateevolution. The general factor may be a capacity for asort of auditory scene analysis (Bregman, 1990) that weassume to have been important throughout the evolutionof vertebrate hearing. In this review we concentrateon hearing mechanisms of ¢shes because these vertebratesillustrate functions and functional relationshipsin the auditory system that tend to be widely sharedamong vertebrates. There are also instances where thesame basic structures are found throughout the vertebratesand provide the basis for many of the sharedfunctions of the auditory system.
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