Dr. Kristen Harris recently published a paper entitled “Differential effects of strain, circadian cycle, and stimulation pattern on LTP and concurrent LTD in the dentate gyrus of freely moving rats” in the journal Hippocampus. This research revealed how these natural and experimental factors regulate granule cell excitability, and differentially affect LTP and concurrent LTD in the dentate gyrus of freely moving rats.
Bowden JB, Abraham WC, Harris KM. (2012). Hippocampus, 22(6):1363-1370.