[The relearning time of rats in a radial maze elicited by the revolving alteration of extra-maze markers].

: A new approach was applied to evaluation the errors in the course of learning of rats in 12-arm radial maze (RM). The number of repeated erroneous visits of the last six arms ("late errors") decreased only after a decrease in the number of repeated erroneous visits of the first six arms ("early errors"). This points to insufficiency of using the common index of the mean error for evaluating learning ability in the RM. Change in the character of errors in the operative and space memory was studied in the RM-conditioned rats after disruption of the relations between the intra- and extra-maze markers. This disruption was reached by rotation of the RM by 180 degrees after rat's visiting of 5 arms during its stay in the 6th one. It was found out that rats were able to recognize the changes in the extra-maze markers caused by the RM turn and to relearn within 4-5 days.