This Volume is concerned with sensory systems and some aspects of function of the central nervous system. Sensory systems have been extensively studied in fish not only because of a wide general interest in the behavioral and sensory physiology of this group but also because, in many instances, fish are technically suitable for general studies of sensory systems and have certain receptors not present in other groups. Electroreceptors fall into this category; these receptors are unique to fishes, and studies of this system have application to receptor function in general.
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