Results from Morris water maze tests.

<p>(A) The average incubation period from the first to fifth day for the four groups. After 3 months and 7 months of intervention, the mice in HG and NG spent much less time searching for new (reversal) hidden platform on each reversal training day compared to MG, * P<0.001. (B) The time spent in the third quadrant for HG, LG, and NG was much greater than that of the mice in MG, * P<0.01.