(D) Extracellular recordings (fEPSPs) in hippocampal brain slices from 6 months-old WT and MPS-IIIA mice. The left panel shows representative fEPSP traces. Summary graphs show the fEPSPs slope as a function of either the applied stimulus intensity or the prevolley amplitude. Data are the average of the values from 9 slices (from 9 mice) in the WT group and 6 slices (from 5 mice) in the MPS-IIIA. *p<0.05, repeated measure ANOVA. 