Neuronal metabolism and sympathetic pupillary activity in infants.

A delayed or immature transmission dynamics of an otherwise diffuse mesolimbic catecholamine circuit is suggested to be the reason behind lack of pupillary activity and reflex often observed in infants less than one year of age. This deficiency is known to be fully compensated in later years following a growing curve of neuronal metabolic change and as well as a curve for synaptoogenesis.