Unit activity of the medial wall of the frontal cortex during delayed performance in rats. 
Unit activity from the medial frontal cortex was studied in rats during delayed performance on the U-shaped maze.  Most units sampled responded to more than one event in the experimental sequence.  Spatio-selective units suggest that this area is involved in short-term memory.  Several types of spatio-selective units were recorded.  Specific responses of spatio-selective units appear linked with a level of training.  A possible role of the medial wall for goal-directed behavior based on probability prognosis is discussed.