Abstract
The development of spontaneous activity and of responses to flash has been studied in single neurons of marginal gyrus in kittens from birth to age 8 weeks. No spontaneous or evoked activity was found in cortical neurons in the immediate neonatal period. In subcortical fibers, spontaneous activity was present already at birth. The first recordable spontaneous activity in cortical neurons consisted of brief, synchronous bursts, followed by prolonged periods of silence. Maturational changes in spontaneous neuronal activity consisted of a decrease in synchrony of neuronal discharges, an increase in rate of spontaneous discharges, and the appearance of tonic discharges in a large number of cortical neurons. Flash responses in cortical neurons were prominent in the more immature animals, but diminished as maturation progressed.
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