[The effect of a decrease in cerebral noradrenaline concentrations on the formation and fixation of temporary connections].

A sharp drop in the noradrenaline content (Na) in the brain of mice does not prevent the elaboration and fixation of relatively simple conditioned reflexes, but considerably disturbs the elaboration of more complex conditioned reflexes with delayed reinforcement. The decrease in the NA content in the brain does not appear to influence directly the process of consolidation of temporary connections; impaired fixation of relatively more complex forms of temporary connections is of a secondary nature and is due to disturbances in their formation.