Interactive effects of training condition and septal lesions on perseverative responding in the rat.

Rats that had received septal lesions either prior to acquisition of a position habit (Group SAR) or immediately after position habit acquisition (Group SR) were tested on two reversals of the task. Compared with control-operated rats, both groups of rats with septal lesions exhibited position-habit reversal deficits. The two groups with septal lesions could not be distinguished in terms of the total number of errors made during reversal learning, but could be distinguished on the basis of the type of error committed. Compared with Group SR, Group SAR made significantly more perservative errors on the first reversal and significantly fewer perserverative errors on the second reversal. Group SR made significantly more nonperservative errors than Group SAR on both reversals.