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The continual search for the neural substrates underlying integrated behavior has been aided dramatically by the development of tracer techniques based on axoplasmic transport, cytochemistry , and metabolic markers. Over the past ten years the major use of these approaches has been to revamp our ideas of how the nervous system is interconnected and, to the delight of publishers, to revise the textbooks in the field. The race to establish what is connected to what has peaked and there are now more attempts to use the knowledge and techniques to study the neural basis of integrated functions. Recent particularly fine examples are those of Swanson and colleagues (Swanson it is clearly a situation that calls for the use of a stringent operational definition,
Smith et al. (Thu,) studied this question.