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Male Wistar rats received bilateral Fimbria lesions and were postoperatively housed in either standard social conditions or in impoverished conditions (one rat per cage) for 2 weeks in experiment I, and for 7 months in experiment II. The effects of lesion and housing conditions were investigated in the Morris maze spatial orientation task. Fimbria lesions increased the latency to reach the platform during acquisition in both experiments, which indicates that functional recovery of the Morris maze impairment does not occur in 7 months time. Post-operative impoverishment for 2 weeks or for 7 months reduced the lesion induced deficit in Morris maze acquisition, while it had a more general effect in the trial without platform. Interestingly, the impoverishment effects were not more severe after 7 months, but even less easily detected. Thes...
The ACTH(4–9) analog ORG2766 has been known to affect recovery of damaged functions resulting from injury to neural tissue. The peptides efficacy has often been ascribed to a facilitation of existing recovery, and immediate treatment seemed a prerequisite for efficacy. However, various results in other recovery paradigms do not refer to the neurotrophic properties of the peptide, but rather ascribe the effectiveness of ORG2766 to a general change in attention that indirectly affects functional recovery. Such a change in state is theoretically independent of the occurrence of spontaneous recovery, and, thus, treatment would not be required to coincide with recovery immediately after the damage. To see if ORG2766 can influence the recovery of function without the simultaneous occurrence of spontaneous recovery, this study employed a dela...
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