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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: Radiat Res. 2014 Jun 17;182(1):60–71. doi: 10.1667/RR13662.1

FIG. 1.

FIG. 1

Recognition memory. Discrimination ratios for novelty preference are plotted for individual rats irradiated (closed symbols) or sham-irradiated (open symbols) at either 3 or 18 months of age and tested in the NOR 30, NOR 6 and NOL at 3, 6 and 12 months after treatment. The group mean (with standard deviation) also is indicated; groups of subjects for which the mean discrimination ratio was not significantly different from chance are indicated (NS = P > 0.05). *P < 0.05 vs. age-matched, sham-irradiated control; aP < 0.05 for indicated age comparison within treatment group.