Neurophysiological Aspects of Behavior Development in the Chick Embryo

Publisher Summary This chapter presents the electrophysiological studies for behavior development in the chick embryo. In a study described in the chapter, spinal cord bioelectric activity was traced from the fourth day of incubation until hatching on the twenty-first day. The special properties of the electrophysiological preparation were utilized to test the significance of movement-produced feedback to embryonic motility. This was done by comparing the amount of burst activity, the neural correlate of motility, before and after the immobilization of embryos with curare. No significant differences were found, indicating that movement-produced feedback has little, if any, effect on the amount of spontaneous embryonic motility at the 15-day stage tested. A final study involved the examination of burst discharges occurring at two different spinal cord loci. This constituted a study of communication within the embryonic cord. The rather surprising result was that nearly synchronous burst discharges were observed along the rostrocaudal axis of the ventral cord from at least the sixth to the 19th day.

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