Figure 3.

ITI responding during the first minute of the intertrial interval (ITI). Hippocampal lesion increased ITI responding during the first minute of the ITI during acquisition and extinction (A). Group differences were not present during the second or third minute of the ITI (not shown). WKY rats showed a trend for increased ITI responding during the first minute of the ITI in the avoidance phase, but not extinction (B). Strain differences were not observed during the second or third minute of the ITI (not shown).